{"id":18776,"date":"2021-12-17T11:45:10","date_gmt":"2021-12-17T04:45:10","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=18776"},"modified":"2021-12-17T12:47:36","modified_gmt":"2021-12-17T05:47:36","slug":"he-truc-toa-do","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/he-truc-toa-do\/","title":{"rendered":"H\u1ec6 TR\u1ee4C T\u1eccA \u0110\u1ed8"},"content":{"rendered":"<p><strong>I \u2013 LY\u0301 THUY\u00ca\u0301T<\/strong><\/p>\n<p><strong>1. Tr\u1ee5c v\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u1ea1i s\u1ed1 tr\u00ean tr\u1ee5c<\/strong><\/p>\n<p><strong>a)<\/strong>\u0110\u1ecbnh ngh\u0129a<\/p>\n<ul>\n<li>Tr\u1ee5c t\u1ecda \u0111\u1ed9 (hay g\u1ecdi t\u1eaft l\u00e0 tr\u1ee5c) l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng tr\u00ean \u0111\u00f3 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh m\u1ed9t \u0111i\u1ec3m <img decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-18777\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-2.png\" alt=\"IMG_256\" \/> g\u1ecdi l\u00e0 \u0111i\u1ec3m g\u1ed1c v\u00e0 m\u1ed9t vect\u01a1 \u0111\u01a1n v\u1ecb <img decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-18778\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-2.png\" alt=\"IMG_257\" \/><\/li>\n<li>\u0110i\u1ec3m <img decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-18779\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-2.png\" alt=\"IMG_258\" \/> g\u1ecdi l\u00e0 g\u1ed1c t\u1ecda \u0111\u1ed9.<\/li>\n<li>H\u01b0\u1edbng c\u1ee7a vecto \u0111\u01a1n v\u1ecb l\u00e0 h\u01b0\u1edbng c\u1ee7a tr\u1ee5c.<\/li>\n<li>Ta k\u00ed hi\u1ec7u tr\u1ee5c \u0111\u00f3 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"34\" class=\"wp-image-18780\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-2.png\" alt=\"IMG_259\" \/><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"401\" height=\"65\" class=\"wp-image-18781\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-2.png\" alt=\"IMG_260\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_260-2.png 401w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_260-2-300x49.png 300w\" sizes=\"(max-width: 401px) 100vw, 401px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"401\" height=\"65\" class=\"wp-image-18782\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261.png\" alt=\"IMG_261\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_261.png 401w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_261-300x49.png 300w\" sizes=\"(max-width: 401px) 100vw, 401px\" \/><\/p>\n<p><strong>b) <\/strong>Cho <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18783\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-1.png\" alt=\"IMG_262\" \/> l\u00e0 m\u1ed9t \u0111i\u1ec3m t\u00f9y \u00fd tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"34\" class=\"wp-image-18784\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-1.png\" alt=\"IMG_263\" \/> Khi \u0111\u00f3 c\u00f3 duy nh\u1ea5t m\u1ed9t s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18785\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-1.png\" alt=\"IMG_264\" \/> sao cho k <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"32\" class=\"wp-image-18786\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-1.png\" alt=\"IMG_265\" \/> Ta g\u1ecdi s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-18787\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-1.png\" alt=\"IMG_266\" \/> \u0111\u00f3 l\u00e0 t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"19\" class=\"wp-image-18788\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-1.png\" alt=\"IMG_267\" \/> \u0111\u1ed1i v\u1edbi tr\u1ee5c \u0111\u00e3 cho.<\/p>\n<p><strong>c) <\/strong>Cho hai \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"19\" class=\"wp-image-18789\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-1.png\" alt=\"IMG_268\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"19\" class=\"wp-image-18790\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-1.png\" alt=\"IMG_269\" \/> tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"34\" class=\"wp-image-18791\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270.png\" alt=\"IMG_270\" \/> Khi \u0111\u00f3 c\u00f3 duy nh\u1ea5t s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-18792\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-1.png\" alt=\"IMG_271\" \/> sao cho a <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"32\" class=\"wp-image-18793\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-1.png\" alt=\"IMG_272\" \/> Ta g\u1ecdi s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-18794\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-1.png\" alt=\"IMG_273\" \/> l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u1ea1i s\u1ed1 c\u1ee7a vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18795\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-1.png\" alt=\"IMG_274\" \/> \u0111\u1ed1i v\u1edbi tr\u1ee5c \u0111\u00e3 cho v\u00e0 k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"68\" height=\"28\" class=\"wp-image-18796\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-1.png\" alt=\"IMG_275\" \/><\/p>\n<p><strong>Nh\u1eadn x\u00e9t.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-18797\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-1.png\" alt=\"IMG_276\" \/> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18798\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-1.png\" alt=\"IMG_277\" \/> c\u00f9ng h\u01b0\u1edbng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-18799\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-1.png\" alt=\"IMG_278\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"83\" height=\"32\" class=\"wp-image-18800\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279.png\" alt=\"IMG_279\" \/> c\u00f2n n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"25\" class=\"wp-image-18801\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-1.png\" alt=\"IMG_280\" \/> ng\u01b0\u1ee3c h\u01b0\u1edbng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-18802\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-1.png\" alt=\"IMG_281\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"97\" height=\"32\" class=\"wp-image-18803\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-1.png\" alt=\"IMG_282\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"15\" class=\"wp-image-18804\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-1.png\" alt=\"IMG_283\" \/> N\u1ebfu hai \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-18805\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-1.png\" alt=\"IMG_284\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"22\" class=\"wp-image-18806\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-1.png\" alt=\"IMG_285\" \/> tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"57\" height=\"34\" class=\"wp-image-18807\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-1.png\" alt=\"IMG_286\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 l\u1ea7n l\u01b0\u1ee3t l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-18808\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-1.png\" alt=\"IMG_287\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-18809\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-1.png\" alt=\"IMG_288\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"28\" class=\"wp-image-18810\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-2.png\" alt=\"IMG_289\" \/><\/p>\n<p><strong>2. H\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9<\/strong><\/p>\n<p><strong>a) \u0110\u1ecbnh ngh\u0129a.<\/strong> H\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"37\" class=\"wp-image-18811\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-2.png\" alt=\"IMG_290\" \/> g\u1ed3m hai tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"37\" class=\"wp-image-18812\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-2.png\" alt=\"IMG_291\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"37\" class=\"wp-image-18813\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-2.png\" alt=\"IMG_292\" \/> vu\u00f4ng g\u00f3c v\u1edbi nhau. \u0110i\u1ec3m g\u1ed1c <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-18814\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-2.png\" alt=\"IMG_293\" \/> chung c\u1ee7a hai tr\u1ee5c g\u1ecdi l\u00e0 g\u1ed1c t\u1ecda \u0111\u1ed9. Tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"37\" class=\"wp-image-18815\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-2.png\" alt=\"IMG_294\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tr\u1ee5c ho\u00e0nh v\u00e0 k\u00ed hi\u1ec7u l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18816\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-2.png\" alt=\"IMG_295\" \/> tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"37\" class=\"wp-image-18817\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-2.png\" alt=\"IMG_296\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tr\u1ee5c tung v\u00e0 k\u00ed hi\u1ec7u l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18818\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-2.png\" alt=\"IMG_297\" \/> C\u00e1c vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"25\" class=\"wp-image-18819\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-2.png\" alt=\"IMG_298\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"28\" class=\"wp-image-18820\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-2.png\" alt=\"IMG_299\" \/> l\u00e0 c\u00e1c vect\u01a1 \u0111\u01a1n v\u1ecb tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"19\" class=\"wp-image-18821\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-2.png\" alt=\"IMG_300\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"22\" class=\"wp-image-18822\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-2.png\" alt=\"IMG_301\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"37\" class=\"wp-image-18823\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-2.png\" alt=\"IMG_302\" \/> H\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"37\" class=\"wp-image-18824\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-2.png\" alt=\"IMG_303\" \/> c\u00f2n \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"28\" class=\"wp-image-18826\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-2.png\" alt=\"IMG_305\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"538\" height=\"143\" class=\"wp-image-18825\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-2.png\" alt=\"IMG_304\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_304-2.png 538w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_304-2-300x80.png 300w\" sizes=\"(max-width: 538px) 100vw, 538px\" \/><\/p>\n<p>M\u1eb7t ph\u1eb3ng m\u00e0 tr\u00ean \u0111\u00f3 \u0111\u00e3 cho m\u1ed9t h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18827\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-2.png\" alt=\"IMG_306\" \/> c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18828\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-2.png\" alt=\"IMG_307\" \/> hay g\u1ecdi t\u1eaft l\u00e0 m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"28\" class=\"wp-image-18829\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-2.png\" alt=\"IMG_308\" \/><\/p>\n<p><strong>b) T\u1ecda \u0111\u1ed9 c\u1ee7a vect\u01a1<\/strong><\/p>\n<p>Trong m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18830\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-2.png\" alt=\"IMG_309\" \/> cho m\u1ed9t vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-18831\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-2.png\" alt=\"IMG_310\" \/> t\u00f9y \u00fd. V\u1ebd <img loading=\"lazy\" decoding=\"async\" width=\"63\" height=\"30\" class=\"wp-image-18832\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-2.png\" alt=\"IMG_311\" \/> v\u00e0 g\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"32\" class=\"wp-image-18833\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-2.png\" alt=\"IMG_312\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_312-2.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_312-2-50x32.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 h\u00ecnh chi\u1ebfu c\u1ee7a vu\u00f4ng g\u00f3c c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"19\" class=\"wp-image-18834\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-2.png\" alt=\"IMG_313\" \/> l\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-18835\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-2.png\" alt=\"IMG_314\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18836\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-2.png\" alt=\"IMG_315\" \/> Ta c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"132\" height=\"34\" class=\"wp-image-18837\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-2.png\" alt=\"IMG_316\" \/> v\u00e0 c\u1eb7p s\u1ed1 duy nh\u1ea5t <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"34\" class=\"wp-image-18838\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-2.png\" alt=\"IMG_317\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_317-2.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_317-2-50x34.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> \u0111\u1ec3 <img loading=\"lazy\" decoding=\"async\" width=\"170\" height=\"34\" class=\"wp-image-18839\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-2.png\" alt=\"IMG_318\" \/> Nh\u01b0 v\u1eady <img loading=\"lazy\" decoding=\"async\" width=\"95\" height=\"28\" class=\"wp-image-18840\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-2.png\" alt=\"IMG_319\" \/><\/p>\n<p>C\u1eb7p s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"28\" class=\"wp-image-18841\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-2.png\" alt=\"IMG_320\" \/> duy nh\u1ea5t \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u1ecda \u0111\u1ed9 c\u1ee7a vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18842\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-2.png\" alt=\"IMG_321\" \/> \u0111\u1ed1i v\u1edbi h\u1ec7 t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-18843\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-2.png\" alt=\"IMG_322\" \/> v\u00e0 vi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"84\" height=\"34\" class=\"wp-image-18844\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-2.png\" alt=\"IMG_323\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"34\" class=\"wp-image-18845\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-2.png\" alt=\"IMG_324\" \/> S\u1ed1 th\u1ee9 nh\u1ea5t <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"19\" class=\"wp-image-18846\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-2.png\" alt=\"IMG_325\" \/> g\u1ecdi l\u00e0 ho\u00e0nh \u0111\u1ed9, s\u1ed1 th\u1ee9 hai <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-18847\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-2.png\" alt=\"IMG_326\" \/> g\u1ecdi l\u00e0 tung \u0111\u1ed9 c\u1ee7a ve \u00a0ct\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"24\" class=\"wp-image-18849\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-2.png\" alt=\"IMG_328\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"187\" class=\"wp-image-18848\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-2.png\" alt=\"IMG_327\" \/><\/p>\n<p>Nh\u01b0 v\u1eady<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"257\" height=\"43\" class=\"wp-image-18850\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-2.png\" alt=\"IMG_329\" \/><\/p>\n<p><strong>Nh\u1eadn x\u00e9t.<\/strong> T\u1eeb \u0111\u1ecbnh ngh\u0129a t\u1ecda \u0111\u1ed9 c\u1ee7a vect\u01a1, ta th\u1ea5y hai vect\u01a1 b\u1eb1ng nhau khi v\u00e0 ch\u1ec9 khi ch\u00fang c\u00f3 ho\u00e0nh \u0111\u1ed9 b\u1eb1ng nhau v\u00e0 tung \u0111\u1ed9 b\u1eb1ng nhau.<\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"84\" height=\"34\" class=\"wp-image-18851\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-2.png\" alt=\"IMG_330\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"95\" height=\"37\" class=\"wp-image-18852\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-2.png\" alt=\"IMG_331\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"69\" class=\"wp-image-18853\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-2.png\" alt=\"IMG_332\" \/><\/p>\n<p>Nh\u01b0 v\u1eady, m\u1ed7i vect\u01a1 \u0111\u01b0\u1ee3c ho\u00e0n to\u00e0n x\u00e1c \u0111\u1ecbnh khi bi\u1ebft t\u1ecda \u0111\u1ed9 c\u1ee7a n\u00f3.<\/p>\n<p><strong>c) T\u1ecda \u0111\u1ed9 c\u1ee7a m\u1ed9t \u0111i\u1ec3m<\/strong><\/p>\n<p>Trong m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18854\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-2.png\" alt=\"IMG_333\" \/> cho m\u1ed9t \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18855\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-2.png\" alt=\"IMG_334\" \/> t\u00f9y \u00fd. T\u1ecda \u0111\u1ed9 c\u1ee7a vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"30\" class=\"wp-image-18856\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-2.png\" alt=\"IMG_335\" \/> \u0111\u1ed1i v\u1edbi h\u1ec7 tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18857\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-2.png\" alt=\"IMG_336\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18858\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-2.png\" alt=\"IMG_337\" \/> \u0111\u1ed1i v\u1edbi h\u1ec7 tr\u1ee5c \u0111\u00f3.<\/p>\n<p>Nh\u01b0 v\u1eady, c\u1eb7p s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"34\" class=\"wp-image-18859\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-2.png\" alt=\"IMG_338\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_338-2.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_338-2-50x34.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> l\u00e0 t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18860\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-2.png\" alt=\"IMG_339\" \/> khi v\u00e0 ch\u1ec9 khi <img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"34\" class=\"wp-image-18861\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-2.png\" alt=\"IMG_340\" \/> Khi \u0111\u00f3 ta vi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"75\" height=\"34\" class=\"wp-image-18862\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-2.png\" alt=\"IMG_341\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"34\" class=\"wp-image-18863\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-2.png\" alt=\"IMG_342\" \/> S\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"19\" class=\"wp-image-18864\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-2.png\" alt=\"IMG_343\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ho\u00e0nh \u0111\u1ed9, c\u00f2n s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-18865\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-2.png\" alt=\"IMG_344\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tung \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-18866\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-2.png\" alt=\"IMG_345\" \/> Ho\u00e0nh \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18867\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-2.png\" alt=\"IMG_346\" \/> c\u00f2n \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"32\" class=\"wp-image-18868\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-2.png\" alt=\"IMG_347\" \/> tung \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"19\" class=\"wp-image-18869\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-2.png\" alt=\"IMG_348\" \/> c\u00f2n \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"32\" class=\"wp-image-18870\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-2.png\" alt=\"IMG_349\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"265\" height=\"44\" class=\"wp-image-18871\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-2.png\" alt=\"IMG_350\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"212\" class=\"wp-image-18872\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-2.png\" alt=\"IMG_351\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"219\" class=\"wp-image-18873\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-2.png\" alt=\"IMG_352\" \/><\/p>\n<p>Ch\u00fa \u00fd r\u1eb1ng, n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"197\" height=\"32\" class=\"wp-image-18874\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-2.png\" alt=\"IMG_353\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"167\" height=\"34\" class=\"wp-image-18875\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-2.png\" alt=\"IMG_354\" \/><\/p>\n<p><strong>d) Li\u00ean h\u1ec7 gi\u1eefa t\u1ecda \u0111\u1ed9 c\u1ee7a \u0111i\u1ec3m v\u00e0 t\u1ecda \u0111\u1ed9 c\u1ee7a vect\u01a1 trong m\u1eb7t ph\u1eb3ng<\/strong><\/p>\n<p>Cho hai \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"34\" class=\"wp-image-18876\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-2.png\" alt=\"IMG_355\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"34\" class=\"wp-image-18877\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_356-2.png\" alt=\"IMG_356\" \/> Ta c\u00f3<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"45\" class=\"wp-image-18878\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-2.png\" alt=\"IMG_357\" \/><\/p>\n<p><strong>3. T\u1ecda \u0111\u1ed9 c\u1ee7a c\u00e1c vect\u01a1 <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"129\" height=\"28\" class=\"wp-image-18879\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-2.png\" alt=\"IMG_358\" \/><\/p>\n<p>Ta c\u00f3 c\u00e1c c\u00f4ng th\u1ee9c sau:<\/p>\n<table>\n<tbody>\n<tr>\n<td>Cho <img loading=\"lazy\" decoding=\"async\" width=\"192\" height=\"34\" class=\"wp-image-18880\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_359-2.png\" alt=\"IMG_359\" \/><\/p>\n<p>Khi \u0111\u00f3:<\/p>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"189\" height=\"34\" class=\"wp-image-18881\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_360-2.png\" alt=\"IMG_360\" \/> ;<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"189\" height=\"34\" class=\"wp-image-18882\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_361-2.png\" alt=\"IMG_361\" \/> ;<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"194\" height=\"34\" class=\"wp-image-18883\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_362-2.png\" alt=\"IMG_362\" \/><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Nh\u1eadn x\u00e9t.<\/strong> Hai vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"164\" height=\"28\" class=\"wp-image-18884\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_363-2.png\" alt=\"IMG_363\" \/> v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"28\" class=\"wp-image-18885\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_364-2.png\" alt=\"IMG_364\" \/> c\u00f9ng ph\u01b0\u01a1ng khi v\u00e0 ch\u1ec9 khi c\u00f3 m\u1ed9t s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18886\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_365-2.png\" alt=\"IMG_365\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"25\" class=\"wp-image-18887\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_366-2.png\" alt=\"IMG_366\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"25\" class=\"wp-image-18888\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_367-2.png\" alt=\"IMG_367\" \/><\/p>\n<p><strong>4. T\u1ecda \u0111\u1ed9 trung \u0111i\u1ec3m c\u1ee7a \u0111o\u1ea1n th\u1eb3ng. T\u1ecda \u0111\u1ed9 tr\u1ecdng t\u00e2m c\u1ee7a tam gi\u00e1c<\/strong><\/p>\n<p><strong>a)<\/strong> Cho \u0111o\u1ea1n th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"19\" class=\"wp-image-18889\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_368-2.png\" alt=\"IMG_368\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"152\" height=\"28\" class=\"wp-image-18890\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_369-2.png\" alt=\"IMG_369\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_369-2.png 152w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_369-2-150x28.png 150w\" sizes=\"(max-width: 152px) 100vw, 152px\" \/> Ta d\u1ec5 d\u00e0ng ch\u1ee9ng minh \u0111\u01b0\u1ee3c t\u1ecda \u0111\u1ed9 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"66\" height=\"28\" class=\"wp-image-18891\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_370-2.png\" alt=\"IMG_370\" \/> c\u1ee7a \u0111o\u1ea1n th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"19\" class=\"wp-image-18892\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_371-2.png\" alt=\"IMG_371\" \/> l\u00e0<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"255\" height=\"62\" class=\"wp-image-18893\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_372-2.png\" alt=\"IMG_372\" \/><\/p>\n<p><strong>b)<\/strong> Cho tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"19\" class=\"wp-image-18894\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_373-2.png\" alt=\"IMG_373\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"280\" height=\"34\" class=\"wp-image-18895\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_374-2.png\" alt=\"IMG_374\" \/> Khi \u0111\u00f3 t\u1ecda \u0111\u1ed9 c\u1ee7a tr\u1ecdng t\u00e2m <img loading=\"lazy\" decoding=\"async\" width=\"89\" height=\"34\" class=\"wp-image-18896\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_375-2.png\" alt=\"IMG_375\" \/> c\u1ee7a tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"19\" class=\"wp-image-18897\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_376-2.png\" alt=\"IMG_376\" \/> \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"337\" height=\"62\" class=\"wp-image-18898\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_377-1.png\" alt=\"IMG_377\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_377-1.png 337w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_377-1-300x55.png 300w\" sizes=\"(max-width: 337px) 100vw, 337px\" \/><\/p>\n<p><strong>II \u2013 DA\u0323NG TOA\u0301N<\/strong><\/p>\n<ul>\n<li><strong>1. Da\u0323ng 1: T\u00ecm t\u1ecda \u0111\u1ed9 c\u1ee7a m\u1ed9t \u0111i\u1ec3m; t\u1ecda \u0111\u1ed9 vect\u01a1; \u0111\u1ed9 d\u00e0i \u0111\u1ea1i s\u1ed1 c\u1ee7a vect\u01a1 v\u00e0 ch\u1ee9ng minh h\u1ec7 th\u1ee9c li\u00ean quan tr\u00ean tr\u1ee5c <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"40\" class=\"wp-image-18899\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_378-1.png\" alt=\"IMG_378\" \/><\/li>\n<li><strong>Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i<\/strong>.<\/li>\n<\/ul>\n<p>S\u1eed d\u1ee5ng c\u00e1c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<\/a> sau:<\/p>\n<ul>\n<li>Tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"39\" class=\"wp-image-18900\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_379-1.png\" alt=\"IMG_379\" \/> , \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18901\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_380-1.png\" alt=\"IMG_380\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"124\" height=\"28\" class=\"wp-image-18902\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_381-1.png\" alt=\"IMG_381\" \/><\/li>\n<li>Tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"39\" class=\"wp-image-18903\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_382-1.png\" alt=\"IMG_382\" \/> , vecto <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-18904\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_383-1.png\" alt=\"IMG_383\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"124\" height=\"28\" class=\"wp-image-18905\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_384-1.png\" alt=\"IMG_384\" \/><\/li>\n<li>Vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18906\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_385-1.png\" alt=\"IMG_385\" \/> c\u00f3 \u0111\u1ed9 d\u00e0i \u0111\u1ea1i s\u1ed1 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"167\" height=\"28\" class=\"wp-image-18907\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_386-1.png\" alt=\"IMG_386\" \/><\/li>\n<li>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18908\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_387-1.png\" alt=\"IMG_387\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 t\u1ecda \u0111\u1ed9 c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18909\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_388-1.png\" alt=\"IMG_388\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"89\" height=\"28\" class=\"wp-image-18910\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_389-1.png\" alt=\"IMG_389\" \/><\/li>\n<li>T\u1ecda \u0111\u1ed9 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-18911\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_390-1.png\" alt=\"IMG_390\" \/> c\u1ee7a \u0111o\u1ea1n <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-18912\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_391-1.png\" alt=\"IMG_391\" \/> l\u00e0: <img loading=\"lazy\" decoding=\"async\" width=\"104\" height=\"52\" class=\"wp-image-18913\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_392-1.png\" alt=\"IMG_392\" \/><\/li>\n<li>C\u00e1c t\u00ednh ch\u1ea5t:<\/li>\n<\/ul>\n<p>+ <img loading=\"lazy\" decoding=\"async\" width=\"89\" height=\"28\" class=\"wp-image-18914\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_393-1.png\" alt=\"IMG_393\" \/><\/p>\n<p>+ <img loading=\"lazy\" decoding=\"async\" width=\"185\" height=\"28\" class=\"wp-image-18915\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_394-1.png\" alt=\"IMG_394\" \/><\/p>\n<p>+ <img loading=\"lazy\" decoding=\"async\" width=\"289\" height=\"32\" class=\"wp-image-18916\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_395-1.png\" alt=\"IMG_395\" \/><\/p>\n<p><strong>A. V\u00cd D\u1ee4 MINH H\u1eccA<\/strong><\/p>\n<p><strong>Vi\u0301 du\u0323 1: <\/strong>Tr\u00ean tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"40\" class=\"wp-image-18917\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_396-1.png\" alt=\"IMG_396\" \/> cho 2 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"28\" class=\"wp-image-18918\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_397-1.png\" alt=\"IMG_397\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 l\u1ea7n l\u01b0\u1ee3t l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"28\" class=\"wp-image-18919\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_398-1.png\" alt=\"IMG_398\" \/> T\u1ecda \u0111\u1ed9 c\u1ee7a vecto <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18920\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_399-1.png\" alt=\"IMG_399\" \/> l\u00e0:<\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"24\" class=\"wp-image-18921\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_400-1.png\" alt=\"IMG_400\" \/> . <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"24\" class=\"wp-image-18922\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_401-1.png\" alt=\"IMG_401\" \/><strong>.<\/strong> <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"12\" height=\"22\" class=\"wp-image-18923\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_402-1.png\" alt=\"IMG_402\" \/><strong>.<\/strong> <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"22\" class=\"wp-image-18924\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_403-1.png\" alt=\"IMG_403\" \/><strong>.<\/strong><\/p>\n<p><strong>L\u01a1\u0300i gia\u0309i<\/strong><\/p>\n<p><strong>Cho\u0323n B.<\/strong><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"209\" height=\"28\" class=\"wp-image-18925\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_404-1.png\" alt=\"IMG_404\" \/><\/p>\n<p><strong>Vi\u0301 du\u0323 2: <\/strong>Tr\u00ean tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"40\" class=\"wp-image-18926\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_405-1.png\" alt=\"IMG_405\" \/> cho 2 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"28\" class=\"wp-image-18927\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_406-1.png\" alt=\"IMG_406\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 l\u1ea7n l\u01b0\u1ee3t <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"24\" class=\"wp-image-18928\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_407-1.png\" alt=\"IMG_407\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"24\" class=\"wp-image-18929\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_408-1.png\" alt=\"IMG_408\" \/> . T\u1ecda \u0111\u1ed9 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18930\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_409-1.png\" alt=\"IMG_409\" \/> c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"22\" class=\"wp-image-18931\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_410-1.png\" alt=\"IMG_410\" \/> l\u00e0 :<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18932\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_411-1.png\" alt=\"IMG_411\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18933\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_412-1.png\" alt=\"IMG_412\" \/><strong>.<\/strong> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"12\" height=\"22\" class=\"wp-image-18934\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_413-1.png\" alt=\"IMG_413\" \/><strong>.<\/strong> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"22\" class=\"wp-image-18935\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_414-1.png\" alt=\"IMG_414\" \/><strong>.<\/strong><\/p>\n<p><strong>L\u01a1\u0300i gia\u0309i<\/strong><\/p>\n<p><strong>Cho\u0323n D.<\/strong><\/p>\n<p>T\u1ecda \u0111\u1ed9 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18936\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_415-1.png\" alt=\"IMG_415\" \/> l\u00e0: <img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"52\" class=\"wp-image-18937\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_416-1.png\" alt=\"IMG_416\" \/><\/p>\n<p><strong>Vi\u0301 du\u0323 3: <\/strong>Tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"40\" class=\"wp-image-18938\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_417-1.png\" alt=\"IMG_417\" \/> cho 3 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"28\" class=\"wp-image-18939\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_418-1.png\" alt=\"IMG_418\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 l\u1ea7n l\u01b0\u1ee3t l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"28\" class=\"wp-image-18940\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_419-1.png\" alt=\"IMG_419\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_419-1.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_419-1-50x28.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> . T\u00ecm \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18941\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_420-1.png\" alt=\"IMG_420\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"170\" height=\"44\" class=\"wp-image-18942\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_421-1.png\" alt=\"IMG_421\" \/><\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"52\" class=\"wp-image-18943\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_422-1.png\" alt=\"IMG_422\" \/> <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"52\" class=\"wp-image-18944\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_423-1.png\" alt=\"IMG_423\" \/> <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"52\" class=\"wp-image-18945\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_424-1.png\" alt=\"IMG_424\" \/> <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"52\" class=\"wp-image-18946\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_425-1.png\" alt=\"IMG_425\" \/><\/p>\n<p><strong>L\u01a1\u0300i gia\u0309i<\/strong><\/p>\n<p><strong>Cho\u0323n D.<\/strong><\/p>\n<p>G\u1ecdi \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-18947\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_426-1.png\" alt=\"IMG_426\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"19\" class=\"wp-image-18948\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_427-1.png\" alt=\"IMG_427\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"222\" height=\"102\" class=\"wp-image-18949\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_428-1.png\" alt=\"IMG_428\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"322\" height=\"87\" class=\"wp-image-18950\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_429-1.png\" alt=\"IMG_429\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_429-1.png 322w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_429-1-300x81.png 300w\" sizes=\"(max-width: 322px) 100vw, 322px\" \/><\/p>\n<p><strong>V\u00ed d\u1ee5 4: <\/strong>Tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"40\" class=\"wp-image-18951\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_430-1.png\" alt=\"IMG_430\" \/> , cho ba \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"28\" class=\"wp-image-18952\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_431-1.png\" alt=\"IMG_431\" \/> l\u1ea7n l\u01b0\u1ee3t c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"28\" class=\"wp-image-18953\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_432-1.png\" alt=\"IMG_432\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18954\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_433-1.png\" alt=\"IMG_433\" \/> th\u1ecfa m\u00e3n <img loading=\"lazy\" decoding=\"async\" width=\"192\" height=\"28\" class=\"wp-image-18955\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_434-1.png\" alt=\"IMG_434\" \/> .<\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"52\" class=\"wp-image-18956\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_435-1.png\" alt=\"IMG_435\" \/><strong>.<\/strong> <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"43\" height=\"52\" class=\"wp-image-18957\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_436-1.png\" alt=\"IMG_436\" \/><strong>.<\/strong> <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"52\" class=\"wp-image-18958\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_437-1.png\" alt=\"IMG_437\" \/> <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"52\" class=\"wp-image-18959\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_438-1.png\" alt=\"IMG_438\" \/><strong>.<\/strong><\/p>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p><strong>Ch\u1ecdn C.<\/strong><\/p>\n<p>G\u1ecdi \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-18960\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_439-1.png\" alt=\"IMG_439\" \/> c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"19\" class=\"wp-image-18961\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_440-1.png\" alt=\"IMG_440\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"259\" height=\"102\" class=\"wp-image-18962\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_441-1.png\" alt=\"IMG_441\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"527\" height=\"37\" class=\"wp-image-18963\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_442-1.png\" alt=\"IMG_442\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_442-1.png 527w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_442-1-300x21.png 300w\" sizes=\"(max-width: 527px) 100vw, 527px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"52\" class=\"wp-image-18964\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_443-1.png\" alt=\"IMG_443\" \/><\/p>\n<p><strong>B. B\u00c0I T\u1eacP T\u1ef0 LUY\u1ec6N<\/strong><\/p>\n<ol>\n<li>Tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"40\" class=\"wp-image-18965\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_444-1.png\" alt=\"IMG_444\" \/> , cho ba \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"25\" class=\"wp-image-18966\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_445-1.png\" alt=\"IMG_445\" \/> l\u1ea7n l\u01b0\u1ee3t c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"28\" class=\"wp-image-18967\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_446-1.png\" alt=\"IMG_446\" \/><strong>. <\/strong>T\u00ecm t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-18968\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_447-1.png\" alt=\"IMG_447\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"28\" class=\"wp-image-18969\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_448-1.png\" alt=\"IMG_448\" \/> .<\/li>\n<\/ol>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"22\" class=\"wp-image-18970\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_449-1.png\" alt=\"IMG_449\" \/><strong>.<\/strong> <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-18971\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_450-1.png\" alt=\"IMG_450\" \/> <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-18972\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_451-1.png\" alt=\"IMG_451\" \/> <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"23\" class=\"wp-image-18973\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_452-1.png\" alt=\"IMG_452\" \/><\/p>\n<ol>\n<li>Tr\u00ean tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"53\" height=\"40\" class=\"wp-image-18974\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_453-1.png\" alt=\"IMG_453\" \/> , cho ba \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"25\" class=\"wp-image-18975\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_454-1.png\" alt=\"IMG_454\" \/> l\u1ea7n l\u01b0\u1ee3t c\u00f3 t\u1ecda \u0111\u1ed9 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"28\" class=\"wp-image-18976\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_455-1.png\" alt=\"IMG_455\" \/><strong>. <\/strong>\u0110\u1ed9 d\u00e0i \u0111\u1ea1i s\u1ed1 c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18977\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_456-1.png\" alt=\"IMG_456\" \/> l\u00e0:<\/li>\n<\/ol>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"24\" class=\"wp-image-18978\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_457-1.png\" alt=\"IMG_457\" \/><strong>.<\/strong> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-18979\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_458-1.png\" alt=\"IMG_458\" \/> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-18980\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_459-1.png\" alt=\"IMG_459\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-18981\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_460-1.png\" alt=\"IMG_460\" \/><\/p>\n<ul>\n<li><strong>2. D\u1ea0NG 2: T\u00ecm t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m, t\u1ecda \u0111\u1ed9 vect\u01a1 tr\u00ean m\u1eb7t ph\u1eb3ng <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-18982\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_461-1.png\" alt=\"IMG_461\" \/><strong>.<\/strong><\/li>\n<li><strong>Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i<\/strong>.<\/li>\n<li>\u0110\u1ec3 t\u00ecm t\u1ecda \u0111\u1ed9 c\u1ee7a vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"28\" class=\"wp-image-18983\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_462-1.png\" alt=\"IMG_462\" \/> ta l\u00e0m nh\u01b0 sau<\/li>\n<\/ul>\n<p>D\u1ef1ng vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"28\" class=\"wp-image-18984\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_463-1.png\" alt=\"IMG_463\" \/> . G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"28\" class=\"wp-image-18985\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_464-1.png\" alt=\"IMG_464\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_464-1.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_464-1-50x28.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 h\u00ecnh chi\u1ebfu vu\u00f4ng g\u00f3c c\u1ee7a M l\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"28\" class=\"wp-image-18986\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_465-1.png\" alt=\"IMG_465\" \/> . Khi \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"34\" class=\"wp-image-18987\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_466-1.png\" alt=\"IMG_466\" \/> v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"152\" height=\"34\" class=\"wp-image-18988\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_467-1.png\" alt=\"IMG_467\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_467-1.png 152w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_467-1-150x34.png 150w\" sizes=\"(max-width: 152px) 100vw, 152px\" \/><\/p>\n<ul>\n<li>\u0110\u1ec3 t\u00ecm t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m A ta \u0111i t\u00ecm t\u1ecda \u0111\u1ed9 vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-18989\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_468-1.png\" alt=\"IMG_468\" \/><\/li>\n<li>N\u1ebfu bi\u1ebft t\u1ecda \u0111\u1ed9 hai \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"179\" height=\"30\" class=\"wp-image-18990\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_469-1.png\" alt=\"IMG_469\" \/> suy ra t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"28\" class=\"wp-image-18991\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_470-1.png\" alt=\"IMG_470\" \/> \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh theo c\u00f4ng<\/li>\n<\/ul>\n<p>th\u1ee9c <img loading=\"lazy\" decoding=\"async\" width=\"192\" height=\"34\" class=\"wp-image-18992\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_471-1.png\" alt=\"IMG_471\" \/><\/p>\n<p><strong><em>Ch\u00fa \u00fd<\/em><\/strong><em>:<\/em> <img loading=\"lazy\" decoding=\"async\" width=\"89\" height=\"28\" class=\"wp-image-18993\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_472-1.png\" alt=\"IMG_472\" \/> n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"22\" class=\"wp-image-18994\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_473-1.png\" alt=\"IMG_473\" \/> n\u1eb1m tr\u00ean tia <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"22\" class=\"wp-image-18995\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_474-1.png\" alt=\"IMG_474\" \/> (ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"28\" class=\"wp-image-18996\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_475-1.png\" alt=\"IMG_475\" \/> ) v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"107\" height=\"28\" class=\"wp-image-18997\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_476-1.png\" alt=\"IMG_476\" \/> n\u1ebfu H n\u1eb1m tr\u00ean tia \u0111\u1ed1i tia <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-18998\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_477-1.png\" alt=\"IMG_477\" \/> (ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"28\" class=\"wp-image-18999\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_478-1.png\" alt=\"IMG_478\" \/> ).<\/p>\n<p><strong>A. V\u00cd D\u1ee4 MINH H\u1eccA<\/strong><\/p>\n<p><strong>Vi\u0301 du\u0323 1: <\/strong>Trong m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-19000\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_479-1.png\" alt=\"IMG_479\" \/> . Cho \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"75\" height=\"34\" class=\"wp-image-19001\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_480-1.png\" alt=\"IMG_480\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 c\u1ee7a c\u00e1c \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"28\" class=\"wp-image-19002\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_481-1.png\" alt=\"IMG_481\" \/> \u0111\u1ed1i x\u1ee9ng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-19003\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_482-1.png\" alt=\"IMG_482\" \/> qua tr\u1ee5c ho\u00e0nh?<\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"34\" class=\"wp-image-19004\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_483-1.png\" alt=\"IMG_483\" \/> . <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"34\" class=\"wp-image-19005\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_484-1.png\" alt=\"IMG_484\" \/> . <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"34\" class=\"wp-image-19006\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_485-1.png\" alt=\"IMG_485\" \/> . <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"34\" class=\"wp-image-19007\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_486-1.png\" alt=\"IMG_486\" \/> .<\/p>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p><strong>Ch\u1ecdn A.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"28\" class=\"wp-image-19008\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_487-1.png\" alt=\"IMG_487\" \/> \u0111\u1ed1i x\u1ee9ng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-19009\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_488-1.png\" alt=\"IMG_488\" \/> qua tr\u1ee5c ho\u00e0nh suy ra <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"34\" class=\"wp-image-19010\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_489-1.png\" alt=\"IMG_489\" \/> .<\/p>\n<p><strong>V\u00ed d\u1ee5 2:<\/strong>Vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"34\" class=\"wp-image-19011\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_490-1.png\" alt=\"IMG_490\" \/> \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch theo hai vect\u01a1 \u0111\u01a1n v\u1ecb nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"32\" class=\"wp-image-19012\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_491-1.png\" alt=\"IMG_491\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"32\" class=\"wp-image-19013\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_492-1.png\" alt=\"IMG_492\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-19014\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_493-1.png\" alt=\"IMG_493\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"28\" class=\"wp-image-19015\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_494-1.png\" alt=\"IMG_494\" \/> .<\/p>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p><strong>Ch\u1ecdn D<\/strong><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"264\" height=\"34\" class=\"wp-image-19016\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_495-1.png\" alt=\"IMG_495\" \/> .<\/p>\n<p><strong>V\u00ed d\u1ee5 3:<\/strong>M\u1ec7nh \u0111\u1ec1 n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n<p><strong>A. <\/strong>Hai vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"203\" height=\"34\" class=\"wp-image-19017\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_496-1.png\" alt=\"IMG_496\" \/> \u0111\u1ed1i nhau.<\/p>\n<p><strong>B. <\/strong>Hai vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"213\" height=\"34\" class=\"wp-image-19018\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_497-1.png\" alt=\"IMG_497\" \/> \u0111\u1ed1i nhau.<\/p>\n<p><strong>C. <\/strong>Hai vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"34\" class=\"wp-image-19019\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_498-1.png\" alt=\"IMG_498\" \/> \u0111\u1ed1i nhau.<\/p>\n<p><strong>D. <\/strong>Hai vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"189\" height=\"34\" class=\"wp-image-19020\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_499-1.png\" alt=\"IMG_499\" \/> \u0111\u1ed1i nhau.<\/p>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p><strong>Ch\u1ecdn C<\/strong><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"268\" height=\"34\" class=\"wp-image-19021\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_500-1.png\" alt=\"IMG_500\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"28\" class=\"wp-image-19022\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_501-1.png\" alt=\"IMG_501\" \/> \u0111\u1ed1i nhau.<\/p>\n<p><strong>Vi\u0301 du\u0323 4:<\/strong>Trong h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-19023\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_502-1.png\" alt=\"IMG_502\" \/> , cho h\u00ecnh vu\u00f4ng <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"22\" class=\"wp-image-19024\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_503-1.png\" alt=\"IMG_503\" \/> t\u00e2m I v\u00e0 c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"57\" height=\"28\" class=\"wp-image-19025\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_504-1.png\" alt=\"IMG_504\" \/> . Bi\u1ebft \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-19026\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_505-1.png\" alt=\"IMG_505\" \/> thu\u1ed9c tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-19027\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_506-1.png\" alt=\"IMG_506\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-19028\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_507-1.png\" alt=\"IMG_507\" \/> c\u00f9ng h\u01b0\u1edbng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"28\" class=\"wp-image-19029\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_508-1.png\" alt=\"IMG_508\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 c\u00e1c vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-19030\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_509-1.png\" alt=\"IMG_509\" \/> ?<\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"34\" class=\"wp-image-19031\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_510-1.png\" alt=\"IMG_510\" \/> . <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"34\" class=\"wp-image-19032\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_511-1.png\" alt=\"IMG_511\" \/> . <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-19033\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_512-1.png\" alt=\"IMG_512\" \/> . <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"34\" class=\"wp-image-19034\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_513-1.png\" alt=\"IMG_513\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"224\" height=\"214\" class=\"wp-image-19035\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_514-1.png\" alt=\"IMG_514\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p><strong>Ch\u1ecdn C.<\/strong><\/p>\n<p>T\u1eeb gi\u1ea3 thi\u1ebft ta x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c h\u00ecnh vu\u00f4ng tr\u00ean m\u1eb7t<\/p>\n<p>ph\u1eb3ng t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-19036\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_515-1.png\" alt=\"IMG_515\" \/> nh\u01b0 h\u00ecnh v\u1ebd b\u00ean.<\/p>\n<p>V\u00ec \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"28\" class=\"wp-image-19037\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_516-1.png\" alt=\"IMG_516\" \/> suy ra <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"28\" class=\"wp-image-19038\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_517-1.png\" alt=\"IMG_517\" \/><\/p>\n<p>Do \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"34\" class=\"wp-image-19039\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_518-1.png\" alt=\"IMG_518\" \/><\/p>\n<p>V\u1eady <img loading=\"lazy\" decoding=\"async\" width=\"114\" height=\"34\" class=\"wp-image-19040\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_519-1.png\" alt=\"IMG_519\" \/><\/p>\n<p><strong>Vi\u0301 du\u0323 5: <\/strong>Trong m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-19041\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_520-1.png\" alt=\"IMG_520\" \/> . Cho h\u00ecnh thoi <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-19042\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_521-1.png\" alt=\"IMG_521\" \/> c\u1ea1nh a v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"32\" class=\"wp-image-19043\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_522-1.png\" alt=\"IMG_522\" \/> . Bi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-19044\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_523-1.png\" alt=\"IMG_523\" \/> tr\u00f9ng v\u1edbi g\u1ed1c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-19045\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_524-1.png\" alt=\"IMG_524\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-19046\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_525-1.png\" alt=\"IMG_525\" \/> thu\u1ed9c tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"24\" class=\"wp-image-19047\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_526-1.png\" alt=\"IMG_526\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"32\" class=\"wp-image-19048\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_527-1.png\" alt=\"IMG_527\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 c\u00e1c \u0111\u1ec9nh <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"22\" class=\"wp-image-19049\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_528-1.png\" alt=\"IMG_528\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-19050\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_529-1.png\" alt=\"IMG_529\" \/> c\u1ee7a h\u00ecnh thoi <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-19051\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_530-1.png\" alt=\"IMG_530\" \/> .<\/p>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"202\" height=\"68\" class=\"wp-image-19052\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_531-1.png\" alt=\"IMG_531\" \/> . <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"215\" height=\"68\" class=\"wp-image-19053\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_532-1.png\" alt=\"IMG_532\" \/> .<\/p>\n<p><strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"68\" class=\"wp-image-19054\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_533-1.png\" alt=\"IMG_533\" \/> . <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"238\" height=\"68\" class=\"wp-image-19055\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_534-1.png\" alt=\"IMG_534\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"201\" height=\"203\" class=\"wp-image-19056\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_535-1.png\" alt=\"IMG_535\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_535-1.png 201w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_535-1-150x150.png 150w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_535-1-50x50.png 50w\" sizes=\"(max-width: 201px) 100vw, 201px\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p><strong>Ch\u1ecdn A.<\/strong><\/p>\n<p>T\u1eeb gi\u1ea3 thi\u1ebft ta x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c h\u00ecnh thoi tr\u00ean m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-19057\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_536-1.png\" alt=\"IMG_536\" \/><\/p>\n<p>G\u1ecdi I l\u00e0 t\u00e2m h\u00ecnh thoi ta c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"259\" height=\"52\" class=\"wp-image-19058\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_537-1.png\" alt=\"IMG_537\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"299\" height=\"59\" class=\"wp-image-19059\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_538-1.png\" alt=\"IMG_538\" \/><\/p>\n<p>Suy ra <img loading=\"lazy\" decoding=\"async\" width=\"398\" height=\"68\" class=\"wp-image-19060\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_539-1.png\" alt=\"IMG_539\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_539-1.png 398w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_539-1-300x51.png 300w\" sizes=\"(max-width: 398px) 100vw, 398px\" \/> .<\/p>\n<p><strong>B. B\u00c0I T\u1eacP T\u1ef0 LUY\u1ec6N<\/strong><\/p>\n<ol>\n<li>Trong m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"28\" class=\"wp-image-19061\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_540-1.png\" alt=\"IMG_540\" \/> . Cho \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"84\" height=\"34\" class=\"wp-image-19062\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_541-1.png\" alt=\"IMG_541\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 c\u1ee7a c\u00e1c \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"28\" class=\"wp-image-19063\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_542-1.png\" alt=\"IMG_542\" \/> \u0111\u1ed1i x\u1ee9ng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"22\" class=\"wp-image-19064\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_543-1.png\" alt=\"IMG_543\" \/> qua tr\u1ee5c tung?<\/li>\n<\/ol>\n<p><strong>A.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"84\" height=\"34\" class=\"wp-image-19065\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_544-1.png\" alt=\"IMG_544\" \/> . <strong>B.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"34\" class=\"wp-image-19066\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_545-1.png\" alt=\"IMG_545\" \/> . <strong>C.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"34\" class=\"wp-image-19067\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_546-1.png\" alt=\"IMG_546\" \/> . <strong>D.<\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"34\" class=\"wp-image-19068\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_547-1.png\" alt=\"IMG_547\" \/> .<\/p>\n<ol>\n<li>Trong h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"39\" class=\"wp-image-19069\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_548-1.png\" alt=\"IMG_548\" \/> , cho tam gi\u00e1c \u0111\u1ec1u <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-19070\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_549-1.png\" alt=\"IMG_549\" \/> c\u1ea1nh <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-19071\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_550-1.png\" alt=\"IMG_550\" \/> , bi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-19072\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_551-1.png\" alt=\"IMG_551\" \/> l\u00e0 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-19073\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_552-1.png\" alt=\"IMG_552\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"28\" class=\"wp-image-19074\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_553-1.png\" alt=\"IMG_553\" \/> c\u00f9ng h\u01b0\u1edbng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"28\" class=\"wp-image-19075\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_554-1.png\" alt=\"IMG_554\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"32\" class=\"wp-image-19076\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_555-1.png\" alt=\"IMG_555\" \/> c\u00f9ng h\u01b0\u1edbng <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"28\" class=\"wp-image-19077\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_556-1.png\" alt=\"IMG_556\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 c\u1ee7a c\u00e1c \u0111\u1ec9nh c\u1ee7a tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-19078\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_557-1.png\" alt=\"IMG_557\" \/> . <img loading=\"lazy\" decoding=\"async\" width=\"268\" height=\"62\" class=\"wp-image-19079\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_558-1.png\" alt=\"IMG_558\" \/><\/li>\n<li>Trong h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"39\" class=\"wp-image-19080\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_559-1.png\" alt=\"IMG_559\" \/> , cho tam gi\u00e1c \u0111\u1ec1u <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-19081\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_560-1.png\" alt=\"IMG_560\" \/> c\u1ea1nh <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-19082\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_561-1.png\" alt=\"IMG_561\" \/> , bi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-19083\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_562-1.png\" alt=\"IMG_562\" \/> l\u00e0 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-19084\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_563-1.png\" alt=\"IMG_563\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"28\" class=\"wp-image-19085\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_564-1.png\" alt=\"IMG_564\" \/> c\u00f9ng h\u01b0\u1edbng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"28\" class=\"wp-image-19086\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_565-1.png\" alt=\"IMG_565\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"32\" class=\"wp-image-19087\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_566-1.png\" alt=\"IMG_566\" \/> c\u00f9ng h\u01b0\u1edbng <img loading=\"lazy\" decoding=\"async\" width=\"32\" height=\"28\" class=\"wp-image-19088\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_567-1.png\" alt=\"IMG_567\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 t\u00e2m \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"22\" class=\"wp-image-19089\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_568-1.png\" alt=\"IMG_568\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_568-1.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_568-1-50x22.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> .<\/li>\n<\/ol>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p>T\u00e2m \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp tam gi\u00e1c \u0111\u1ec1u tr\u00f9ng v\u1edbi tr\u1ecdng t\u00e2m <img loading=\"lazy\" decoding=\"async\" width=\"98\" height=\"68\" class=\"wp-image-19090\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_569-1.png\" alt=\"IMG_569\" \/><\/p>\n<ol>\n<li>Trong h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"39\" class=\"wp-image-19091\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_570-1.png\" alt=\"IMG_570\" \/> , cho h\u00ecnh thoi <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"24\" class=\"wp-image-19092\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_571-1.png\" alt=\"IMG_571\" \/> t\u00e2m O c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"132\" height=\"28\" class=\"wp-image-19093\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_572-1.png\" alt=\"IMG_572\" \/> . Bi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"28\" class=\"wp-image-19094\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_573-1.png\" alt=\"IMG_573\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"28\" class=\"wp-image-19095\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_574-1.png\" alt=\"IMG_574\" \/> c\u00f9ng h\u01b0\u1edbng, <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-19096\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_575-1.png\" alt=\"IMG_575\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"32\" class=\"wp-image-19097\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_576-1.png\" alt=\"IMG_576\" \/> c\u00f9ng h\u01b0\u1edbng. T\u00ednh t\u1ecda \u0111\u1ed9 tr\u1ecdng t\u00e2m tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-19098\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_577-1.png\" alt=\"IMG_577\" \/><\/li>\n<\/ol>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"409\" height=\"32\" class=\"wp-image-19099\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_578-1.png\" alt=\"IMG_578\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_578-1.png 409w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_578-1-300x23.png 300w\" sizes=\"(max-width: 409px) 100vw, 409px\" \/> .<\/p>\n<ol>\n<li>Cho h\u00ecnh b\u00ecnh h\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"22\" class=\"wp-image-19100\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_579-1.png\" alt=\"IMG_579\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"22\" class=\"wp-image-19101\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_580-1.png\" alt=\"IMG_580\" \/> v\u00e0 chi\u1ec1u cao \u1ee9ng v\u1edbi c\u1ea1nh <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"24\" class=\"wp-image-19102\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_581-1.png\" alt=\"IMG_581\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"32\" class=\"wp-image-19103\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_582-1.png\" alt=\"IMG_582\" \/> . Ch\u1ecdn h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"39\" class=\"wp-image-19104\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_583-1.png\" alt=\"IMG_583\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"28\" class=\"wp-image-19105\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_584-1.png\" alt=\"IMG_584\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"28\" class=\"wp-image-19106\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_585-1.png\" alt=\"IMG_585\" \/> c\u00f9ng h\u01b0\u1edbng, <img loading=\"lazy\" decoding=\"async\" width=\"57\" height=\"32\" class=\"wp-image-19107\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_586-1.png\" alt=\"IMG_586\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 c\u00e1c vecto <img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"32\" class=\"wp-image-19108\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_587-1.png\" alt=\"IMG_587\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"28\" class=\"wp-image-19109\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_588-1.png\" alt=\"IMG_588\" \/><\/li>\n<li>Cho l\u1ee5c gi\u00e1c \u0111\u1ec1u <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"24\" class=\"wp-image-19110\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_589-1.png\" alt=\"IMG_589\" \/> . Ch\u1ecdn h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"39\" class=\"wp-image-19111\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_590-1.png\" alt=\"IMG_590\" \/> , trong \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-19112\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_591-1.png\" alt=\"IMG_591\" \/> l\u00e0 t\u00e2m l\u1ee5c gi\u00e1c \u0111\u1ec1u , <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"28\" class=\"wp-image-19113\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_592-1.png\" alt=\"IMG_592\" \/> c\u00f9ng h\u01b0\u1edbng v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"28\" class=\"wp-image-19114\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_593-1.png\" alt=\"IMG_593\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"32\" class=\"wp-image-19115\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_594-1.png\" alt=\"IMG_594\" \/> c\u00f9ng h\u01b0\u1edbng <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"28\" class=\"wp-image-19116\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_595-1.png\" alt=\"IMG_595\" \/> . T\u00ednh t\u1ecda \u0111\u1ed9 c\u00e1c \u0111\u1ec9nh l\u1ee5c gi\u00e1c \u0111\u1ec1u , bi\u1ebft c\u1ea1nh c\u1ee7a l\u1ee5c gi\u00e1c l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-19117\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_596-1.png\" alt=\"IMG_596\" \/> .<\/li>\n<\/ol>\n<p><strong>L\u1eddi gi\u1ea3i<\/strong><\/p>\n<p>\u0110S: <img loading=\"lazy\" decoding=\"async\" width=\"285\" height=\"34\" class=\"wp-image-19118\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_597-1.png\" alt=\"IMG_597\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"338\" height=\"34\" class=\"wp-image-19119\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_598-1.png\" alt=\"IMG_598\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_598-1.png 338w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_598-1-300x30.png 300w\" sizes=\"(max-width: 338px) 100vw, 338px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I \u2013 LY\u0301 THUY\u00ca\u0301T 1. Tr\u1ee5c v\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u1ea1i s\u1ed1 tr\u00ean tr\u1ee5c a)\u0110\u1ecbnh ngh\u0129a Tr\u1ee5c t\u1ecda \u0111\u1ed9 (hay g\u1ecdi t\u1eaft l\u00e0 tr\u1ee5c) l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng tr\u00ean \u0111\u00f3 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh m\u1ed9t \u0111i\u1ec3m g\u1ecdi l\u00e0 \u0111i\u1ec3m g\u1ed1c v\u00e0 m\u1ed9t vect\u01a1 \u0111\u01a1n v\u1ecb \u0110i\u1ec3m g\u1ecdi l\u00e0 g\u1ed1c t\u1ecda \u0111\u1ed9. H\u01b0\u1edbng c\u1ee7a vecto \u0111\u01a1n v\u1ecb l\u00e0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[41],"tags":[],"class_list":["post-18776","post","type-post","status-publish","format-standard","hentry","category-toan-lop-10"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/18776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=18776"}],"version-history":[{"count":3,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/18776\/revisions"}],"predecessor-version":[{"id":19248,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/18776\/revisions\/19248"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=18776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=18776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=18776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}