{"id":23710,"date":"2021-12-17T17:06:43","date_gmt":"2021-12-17T10:06:43","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=23710"},"modified":"2021-12-17T17:06:46","modified_gmt":"2021-12-17T10:06:46","slug":"toa-do-cua-diem-va-vecto-trong-khong-gian","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/toa-do-cua-diem-va-vecto-trong-khong-gian\/","title":{"rendered":"T\u1eccA \u0110\u1ed8 C\u1ee6A \u0110I\u1ec2M V\u00c0 V\u00c9CT\u01a0 TRONG KH\u00d4NG GIAN"},"content":{"rendered":"<h2><a id=\"post-23710-_Toc492701526\"><\/a><a id=\"post-23710-_Toc493273876\"><\/a><strong>A &#8211; L\u00dd THUY\u1ebeT CHUNG<\/strong><\/h2>\n<h3><strong>1. V\u00e9c t\u01a1 trong kh\u00f4ng gian<\/strong><\/h3>\n<p><strong>* \u0110\u1ecbnh ngh\u0129a<\/strong><\/p>\n<p>Trong kh\u00f4ng gian, vecto l\u00e0 m\u1ed9t \u0111o\u1ea1n th\u1eb3ng c\u00f3 \u0111\u1ecbnh h\u01b0\u1edbng t\u1ee9c l\u00e0 \u0111o\u1ea1n th\u1eb3ng c\u00f3 quy \u0111\u1ecbnh th\u1ee9 t\u1ef1 c\u1ee7a hai \u0111\u1ea7u<\/p>\n<p>\u00fc <strong>Ch\u00fa \u00fd: <\/strong>C\u00e1c \u0111\u1ecbnh ngh\u0129a v\u1ec1 hai vecto b\u1eb1ng nhau, \u0111\u1ed1i nhau v\u00e0 c\u00e1c ph\u00e9p to\u00e1n tr\u00ean c\u00e1c vecto trong kh\u00f4ng gian \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh t\u01b0\u01a1ng t\u1ef1 nh\u01b0 trong m\u1eb7t ph\u1eb3ng.<\/p>\n<h3><strong>2. Vecto \u0111\u1ed3ng ph\u1eb3ng<\/strong><\/h3>\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"375\" height=\"318\" class=\"wp-image-23711\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-40.png\" alt=\"IMG_256\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_256-40.png 375w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_256-40-300x254.png 300w\" sizes=\"(max-width: 375px) 100vw, 375px\" \/><\/p>\n<p><strong>* \u0110\u1ecbnh ngh\u0129a: <\/strong>Ba vecto <img decoding=\"async\" width=\"51\" height=\"33\" class=\"wp-image-23712\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-39.png\" alt=\"IMG_257\" \/> kh\u00e1c <img decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23713\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-40.png\" alt=\"IMG_258\" \/> g\u1ecdi l\u00e0 \u0111\u1ed3ng ph\u1eb3ng khi gi\u00e1 c\u1ee7a ch\u00fang c\u00f9ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng.<\/p>\n<p><strong>Ch\u00fa \u00fd<\/strong>:<\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-23714\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-38.png\" alt=\"IMG_259\" \/> vecto kh\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23715\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-40.png\" alt=\"IMG_260\" \/> g\u1ecdi l\u00e0 \u0111\u1ed3ng ph\u1eb3ng khi gi\u00e1\u3000c\u1ee7a ch\u00fang c\u00f9ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng.<\/p>\n<p>\u00b7 C\u00e1c gi\u00e1 c\u1ee7a c\u00e1c vecto \u0111\u1ed3ng ph\u1eb3ng c\u00f3 th\u1ec3 l\u00e0 c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng ch\u00e9o nhau.<\/p>\n<p><strong>* \u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 3 vecto kh\u00e1c <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23716\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-37.png\" alt=\"IMG_261\" \/><strong>\u0111\u1ed3ng ph\u1eb3ng<\/strong><\/p>\n<p>\u0110\u1ecbnh l\u00fd 1:<\/p>\n<table>\n<tbody>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"51\" height=\"33\" class=\"wp-image-23717\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-38.png\" alt=\"IMG_262\" \/> \u00a0\u0111\u1ed3ng ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"111\" height=\"27\" class=\"wp-image-23718\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-39.png\" alt=\"IMG_263\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"101\" height=\"28\" class=\"wp-image-23719\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-38.png\" alt=\"IMG_264\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>* Ph\u00e2n t\u00edch m\u1ed9t vecto theo ba vecto kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng<\/strong><\/p>\n<p>\u00b7 \u0110\u1ecbnh l\u00fd 2: Cho 3 vecto <img loading=\"lazy\" decoding=\"async\" width=\"67\" height=\"34\" class=\"wp-image-23720\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-38.png\" alt=\"IMG_265\" \/> kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng. B\u1ea5t k\u00ec m\u1ed9t vecto <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23721\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-38.png\" alt=\"IMG_266\" \/> n\u00e0o trong kh\u00f4ng gian c\u0169ng c\u00f3 th\u1ec3 ph\u00e2n t\u00edch theo ba vecto \u0111\u00f3, ngh\u0129a la c\u00f3 m\u1ed9t b\u1ed9 ba s\u1ed1 th\u1ef1c <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"34\" class=\"wp-image-23722\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-39.png\" alt=\"IMG_267\" \/> duy nh\u1ea5t<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"34\" class=\"wp-image-23723\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-39.png\" alt=\"IMG_268\" \/><\/p>\n<p>\u00fc <strong>Ch\u00fa \u00fd<\/strong>: Cho vecto <img loading=\"lazy\" decoding=\"async\" width=\"51\" height=\"33\" class=\"wp-image-23724\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-39.png\" alt=\"IMG_269\" \/> kh\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23725\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-37.png\" alt=\"IMG_270\" \/> :<\/p>\n<p>1. <img loading=\"lazy\" decoding=\"async\" width=\"51\" height=\"33\" class=\"wp-image-23726\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-39.png\" alt=\"IMG_271\" \/> \u0111\u1ed3ng ph\u1eb3ng n\u1ebfu c\u00f3 ba s\u1ed1 th\u1ef1c <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"23\" class=\"wp-image-23727\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-39.png\" alt=\"IMG_272\" \/> kh\u00f4ng \u0111\u1ed3ng th\u1eddi b\u1eb1ng 0 sao cho: <img loading=\"lazy\" decoding=\"async\" width=\"140\" height=\"33\" class=\"wp-image-23728\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-37.png\" alt=\"IMG_273\" \/><\/p>\n<p>2. <img loading=\"lazy\" decoding=\"async\" width=\"51\" height=\"33\" class=\"wp-image-23729\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-38.png\" alt=\"IMG_274\" \/> kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng n\u1ebfu t\u1eeb <img loading=\"lazy\" decoding=\"async\" width=\"277\" height=\"33\" class=\"wp-image-23730\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-37.png\" alt=\"IMG_275\" \/><\/p>\n<p><strong>3. T\u1ecda \u0111\u1ed9 c\u1ee7a vecto<\/strong><\/p>\n<p>Trong kh\u00f4ng gian x\u00e9t h\u1ec7 tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"27\" class=\"wp-image-23731\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-38.png\" alt=\"IMG_276\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_276-38.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_276-38-50x27.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> c\u00f3 tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"24\" class=\"wp-image-23732\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-38.png\" alt=\"IMG_277\" \/> vu\u00f4ng g\u00f3c v\u1edbi tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"31\" height=\"27\" class=\"wp-image-23733\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-39.png\" alt=\"IMG_278\" \/> t\u1ea1i O, v\u00e0 tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"24\" class=\"wp-image-23734\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-37.png\" alt=\"IMG_279\" \/> vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"34\" class=\"wp-image-23735\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-39.png\" alt=\"IMG_280\" \/> t\u1ea1i O. C\u00e1c vecto \u0111\u01a1n v\u1ecb tr\u00ean t\u1eebng tr\u1ee5c <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"27\" class=\"wp-image-23736\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-38.png\" alt=\"IMG_281\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"285\" height=\"35\" class=\"wp-image-23737\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-39.png\" alt=\"IMG_282\" \/><\/p>\n<p><strong>a) <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"293\" height=\"35\" class=\"wp-image-23738\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-38.png\" alt=\"IMG_283\" \/><\/p>\n<p><strong>b) <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"349\" height=\"35\" class=\"wp-image-23739\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-38.png\" alt=\"IMG_284\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_284-38.png 349w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_284-38-300x30.png 300w\" sizes=\"(max-width: 349px) 100vw, 349px\" \/><\/p>\n<p><strong>c) <\/strong>Cho <img loading=\"lazy\" decoding=\"async\" width=\"225\" height=\"34\" class=\"wp-image-23740\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-39.png\" alt=\"IMG_285\" \/> ta c\u00f3:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"254\" height=\"35\" class=\"wp-image-23741\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-38.png\" alt=\"IMG_286\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"351\" height=\"44\" class=\"wp-image-23742\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-39.png\" alt=\"IMG_287\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_287-39.png 351w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_287-39-300x38.png 300w\" sizes=\"(max-width: 351px) 100vw, 351px\" \/><\/p>\n<p><strong>d) <\/strong>M l\u00e0 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"23\" class=\"wp-image-23743\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-39.png\" alt=\"IMG_288\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"249\" height=\"58\" class=\"wp-image-23744\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-40.png\" alt=\"IMG_289\" \/><\/p>\n<p><strong>e) <\/strong>Cho <img loading=\"lazy\" decoding=\"async\" width=\"119\" height=\"35\" class=\"wp-image-23745\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-39.png\" alt=\"IMG_290\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"35\" class=\"wp-image-23746\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-38.png\" alt=\"IMG_291\" \/> ta c\u00f3:<\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"143\" height=\"94\" class=\"wp-image-23747\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-39.png\" alt=\"IMG_292\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"246\" height=\"35\" class=\"wp-image-23748\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-39.png\" alt=\"IMG_293\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"158\" height=\"35\" class=\"wp-image-23749\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-38.png\" alt=\"IMG_294\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"314\" height=\"41\" class=\"wp-image-23750\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-37.png\" alt=\"IMG_295\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_295-37.png 314w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_295-37-300x39.png 300w\" sizes=\"(max-width: 314px) 100vw, 314px\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"165\" height=\"42\" class=\"wp-image-23751\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-37.png\" alt=\"IMG_296\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"405\" height=\"62\" class=\"wp-image-23752\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-37.png\" alt=\"IMG_297\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_297-37.png 405w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_297-37-300x46.png 300w\" sizes=\"(max-width: 405px) 100vw, 405px\" \/> (v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"94\" height=\"33\" class=\"wp-image-23753\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-37.png\" alt=\"IMG_298\" \/> )<\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23754\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-38.png\" alt=\"IMG_299\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23755\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-38.png\" alt=\"IMG_300\" \/> vu\u00f4ng g\u00f3c: <img loading=\"lazy\" decoding=\"async\" width=\"275\" height=\"34\" class=\"wp-image-23756\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-38.png\" alt=\"IMG_301\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23757\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-38.png\" alt=\"IMG_302\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23758\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-38.png\" alt=\"IMG_303\" \/> c\u00f9ng ph\u01b0\u01a1ng: <img loading=\"lazy\" decoding=\"async\" width=\"254\" height=\"94\" class=\"wp-image-23759\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-38.png\" alt=\"IMG_304\" \/><\/p>\n<h3><strong>4. T\u00edch c\u00f3 h\u01b0\u1edbng v\u00e0 \u1ee9ng d\u1ee5ng<\/strong><\/h3>\n<p>T\u00edch c\u00f3 h\u01b0\u1edbng c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"119\" height=\"35\" class=\"wp-image-23760\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-38.png\" alt=\"IMG_305\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"35\" class=\"wp-image-23761\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-38.png\" alt=\"IMG_306\" \/> l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"517\" height=\"67\" class=\"wp-image-23762\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-38.png\" alt=\"IMG_307\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_307-38.png 517w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_307-38-300x39.png 300w\" sizes=\"(max-width: 517px) 100vw, 517px\" \/><\/p>\n<p><strong>a. T\u00ednh ch\u1ea5t:<\/strong><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"41\" class=\"wp-image-23763\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-38.png\" alt=\"IMG_308\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"190\" height=\"44\" class=\"wp-image-23764\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-37.png\" alt=\"IMG_309\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23765\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-38.png\" alt=\"IMG_310\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"28\" class=\"wp-image-23766\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-37.png\" alt=\"IMG_311\" \/> c\u00f9ng ph\u01b0\u01a1ng: <img loading=\"lazy\" decoding=\"async\" width=\"83\" height=\"41\" class=\"wp-image-23767\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-37.png\" alt=\"IMG_312\" \/><\/p>\n<p>\u00b7 <img loading=\"lazy\" decoding=\"async\" width=\"51\" height=\"33\" class=\"wp-image-23768\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-36.png\" alt=\"IMG_313\" \/> \u0111\u1ed3ng ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"122\" height=\"41\" class=\"wp-image-23769\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-36.png\" alt=\"IMG_314\" \/><\/p>\n<p><strong>b. C\u00e1c \u1ee9ng d\u1ee5ng t\u00edch c\u00f3 h\u01b0\u1edbng<\/strong><\/p>\n<p>\u00b7 Di\u1ec7n t\u00edch tam gi\u00e1c: <img loading=\"lazy\" decoding=\"async\" width=\"165\" height=\"52\" class=\"wp-image-23770\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-36.png\" alt=\"IMG_315\" \/><\/p>\n<p>\u00b7 Th\u1ec3 t\u00edch t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"52\" class=\"wp-image-23771\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-36.png\" alt=\"IMG_316\" \/><\/p>\n<p>\u00b7 Th\u1ec3 t\u00edch kh\u1ed1i h\u1ed9p: <img loading=\"lazy\" decoding=\"async\" width=\"243\" height=\"44\" class=\"wp-image-23772\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-36.png\" alt=\"IMG_317\" \/><\/p>\n<h3><strong>5. M\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c kh\u00e1c<\/strong><\/h3>\n<table>\n<tbody>\n<tr>\n<td><strong>a) <\/strong>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"21\" class=\"wp-image-23773\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-36.png\" alt=\"IMG_318\" \/> \u00a0chia \u0111o\u1ea1n AB theo t\u1ec9 s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"125\" height=\"41\" class=\"wp-image-23774\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-36.png\" alt=\"IMG_319\" \/> \u00a0th\u00ec ta c\u00f3:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"360\" height=\"52\" class=\"wp-image-23775\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-36.png\" alt=\"IMG_320\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_320-36.png 360w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_320-36-300x43.png 300w\" sizes=\"(max-width: 360px) 100vw, 360px\" \/> \u00a0v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"44\" height=\"24\" class=\"wp-image-23776\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-35.png\" alt=\"IMG_321\" \/><\/p>\n<p><strong>b) <\/strong>G l\u00e0 tr\u1ecdng t\u00e2m tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"514\" height=\"52\" class=\"wp-image-23777\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-35.png\" alt=\"IMG_322\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_322-35.png 514w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_322-35-300x30.png 300w\" sizes=\"(max-width: 514px) 100vw, 514px\" \/><\/p>\n<p><strong>c) <\/strong>G l\u00e0 tr\u1ecdng t\u00e2m t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"284\" height=\"30\" class=\"wp-image-23778\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-33.png\" alt=\"IMG_323\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><strong>B &#8211; C\u00c1C D\u1ea0NG TO\u00c1N C\u01a0 B\u1ea2N<\/strong><\/h2>\n<p><strong><em>D\u1ea1ng 1. <\/em><\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"27\" class=\"wp-image-23779\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-33.png\" alt=\"IMG_324\" \/> th\u1eb3ng h\u00e0ng <img loading=\"lazy\" decoding=\"async\" width=\"95\" height=\"31\" class=\"wp-image-23780\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-33.png\" alt=\"IMG_325\" \/> c\u00f9ng ph\u01b0\u01a1ng <img loading=\"lazy\" decoding=\"async\" width=\"141\" height=\"41\" class=\"wp-image-23781\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-33.png\" alt=\"IMG_326\" \/> .<\/p>\n<p><strong><em>D\u1ea1ng 2. <\/em><\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"27\" class=\"wp-image-23782\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-33.png\" alt=\"IMG_327\" \/> l\u00e0 ba \u0111\u1ec9nh tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"20\" class=\"wp-image-23783\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-32.png\" alt=\"IMG_328\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"27\" class=\"wp-image-23784\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-32.png\" alt=\"IMG_329\" \/> kh\u00f4ng th\u1eb3ng h\u00e0ng <img loading=\"lazy\" decoding=\"async\" width=\"95\" height=\"31\" class=\"wp-image-23785\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-32.png\" alt=\"IMG_330\" \/> kh\u00f4ng c\u00f9ng ph\u01b0\u01a1ng <img loading=\"lazy\" decoding=\"async\" width=\"146\" height=\"44\" class=\"wp-image-23786\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-32.png\" alt=\"IMG_331\" \/> .<\/p>\n<p><strong><em>D\u1ea1ng 3. <\/em><\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"115\" height=\"34\" class=\"wp-image-23787\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-32.png\" alt=\"IMG_332\" \/> l\u00e0 tr\u1ecdng t\u00e2m tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-23788\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-32.png\" alt=\"IMG_333\" \/> th\u00ec:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"444\" height=\"52\" class=\"wp-image-23789\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-31.png\" alt=\"IMG_334\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_334-31.png 444w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_334-31-300x35.png 300w\" sizes=\"(max-width: 444px) 100vw, 444px\" \/><\/p>\n<p><strong><em>D\u1ea1ng 4. <\/em><\/strong>Cho <img loading=\"lazy\" decoding=\"async\" width=\"56\" height=\"24\" class=\"wp-image-23790\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-31.png\" alt=\"IMG_335\" \/> c\u00f3 c\u00e1c ch\u00e2n <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"27\" class=\"wp-image-23791\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-31.png\" alt=\"IMG_336\" \/> c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c trong v\u00e0 ngo\u00e0i c\u1ee7a g\u00f3c <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"21\" class=\"wp-image-23792\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-31.png\" alt=\"IMG_337\" \/> c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"56\" height=\"24\" class=\"wp-image-23793\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-31.png\" alt=\"IMG_338\" \/> tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-23794\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-30.png\" alt=\"IMG_339\" \/> . Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"52\" class=\"wp-image-23795\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-30.png\" alt=\"IMG_340\" \/><em>, <\/em> <img loading=\"lazy\" decoding=\"async\" width=\"116\" height=\"52\" class=\"wp-image-23796\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-30.png\" alt=\"IMG_341\" \/><\/p>\n<p><strong><em>D\u1ea1ng 5. <\/em><\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"172\" height=\"52\" class=\"wp-image-23797\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-30.png\" alt=\"IMG_342\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"20\" class=\"wp-image-23798\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-29.png\" alt=\"IMG_343\" \/> di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23799\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-29.png\" alt=\"IMG_344\" \/> l\u00e0: <img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"44\" class=\"wp-image-23800\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-29.png\" alt=\"IMG_345\" \/><\/p>\n<p><strong><em>D\u1ea1ng 6. <\/em><\/strong>\u0110\u01b0\u1eddng cao <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"21\" class=\"wp-image-23801\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-28.png\" alt=\"IMG_346\" \/> c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"56\" height=\"24\" class=\"wp-image-23802\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-27.png\" alt=\"IMG_347\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"147\" height=\"52\" class=\"wp-image-23803\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-26.png\" alt=\"IMG_348\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"20\" class=\"wp-image-23804\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-26.png\" alt=\"IMG_349\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"227\" height=\"66\" class=\"wp-image-23805\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-26.png\" alt=\"IMG_350\" \/><\/p>\n<p><strong><em>D\u1ea1ng 7. <\/em><\/strong>T\u00ecm <img loading=\"lazy\" decoding=\"async\" width=\"21\" height=\"21\" class=\"wp-image-23806\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-26.png\" alt=\"IMG_351\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23807\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-26.png\" alt=\"IMG_352\" \/> l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh: T\u1eeb t\/c hbh c\u00f3 4 c\u1eb7p vecto b\u1eb1ng nhau <img loading=\"lazy\" decoding=\"async\" width=\"94\" height=\"31\" class=\"wp-image-23808\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-26.png\" alt=\"IMG_353\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"126\" height=\"31\" class=\"wp-image-23809\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-26.png\" alt=\"IMG_354\" \/> t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"21\" height=\"21\" class=\"wp-image-23810\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-26.png\" alt=\"IMG_355\" \/> .<\/p>\n<p><strong><em>D\u1ea1ng 8. <\/em><\/strong>Ch\u1ee9ng minh <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23811\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_356-26.png\" alt=\"IMG_356\" \/> l\u00e0 m\u1ed9t t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"30\" height=\"20\" class=\"wp-image-23812\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-26.png\" alt=\"IMG_357\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"105\" height=\"31\" class=\"wp-image-23813\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-26.png\" alt=\"IMG_358\" \/> kh\u00f4ng \u0111\u1ed3ng ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"176\" height=\"41\" class=\"wp-image-23814\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_359-25.png\" alt=\"IMG_359\" \/> .<\/p>\n<p><strong><em>D\u1ea1ng 9. <\/em><\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"115\" height=\"34\" class=\"wp-image-23815\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_360-24.png\" alt=\"IMG_360\" \/> l\u00e0 tr\u1ecdng t\u00e2m t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23816\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_361-23.png\" alt=\"IMG_361\" \/> th\u00ec:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"560\" height=\"52\" class=\"wp-image-23817\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_362-23.png\" alt=\"IMG_362\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_362-23.png 560w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_362-23-300x28.png 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><\/p>\n<p><strong><em>D\u1ea1ng 10. <\/em><\/strong>Th\u1ec3 t\u00edch kh\u1ed1i t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23818\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_363-20.png\" alt=\"IMG_363\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"52\" class=\"wp-image-23819\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_364-22.png\" alt=\"IMG_364\" \/><\/p>\n<p><strong><em>D\u1ea1ng 11. <\/em><\/strong>\u0110\u01b0\u1eddng cao <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"21\" class=\"wp-image-23820\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_365-22.png\" alt=\"IMG_365\" \/> c\u1ee7a t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23821\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_366-22.png\" alt=\"IMG_366\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"259\" height=\"56\" class=\"wp-image-23822\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_367-22.png\" alt=\"IMG_367\" \/><\/p>\n<p><strong><em>D\u1ea1ng 12. <\/em><\/strong>Th\u1ec3 t\u00edch h\u00ecnh h\u1ed9p: <img loading=\"lazy\" decoding=\"async\" width=\"245\" height=\"44\" class=\"wp-image-23823\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_368-21.png\" alt=\"IMG_368\" \/> .<\/p>\n<p><strong><em>D\u1ea1ng 13. <\/em><\/strong>H\u00ecnh chi\u1ebfu c\u1ee7a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"112\" height=\"34\" class=\"wp-image-23824\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_369-21.png\" alt=\"IMG_369\" \/> l\u00ean c\u00e1c m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 v\u00e0 c\u00e1c tr\u1ee5c:<br \/>\nXem l\u1ea1i m\u1ee5c 1, c\u00f4ng th\u1ee9c 17, 18.<\/p>\n<p><strong><em>D\u1ea1ng 14. <\/em><\/strong>T\u00ecm \u0111i\u1ec3m \u0111\u1ed1i x\u1ee9ng v\u1edbi \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"34\" class=\"wp-image-23825\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_370-21.png\" alt=\"IMG_370\" \/> qua c\u00e1c m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9, c\u00e1c tr\u1ee5c v\u00e0 g\u1ed1c t\u1ecda \u0111\u1ed9:<br \/>\n(<strong><em>Thi\u1ebfu t\u1ecda \u0111\u1ed9 n\u00e0o th\u00ec \u0111\u1ed5i d\u1ea5u t\u1ecda \u0111\u1ed9 \u0111\u00f3, c\u00f3 m\u1eb7t t\u1ecda \u0111\u1ed9 n\u00e0o th\u00ec \u0111\u1ec3 nguy\u00ean t\u1ecda \u0111\u1ed9 \u0111\u00f3)<\/em><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-23826\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_371-21.png\" alt=\"IMG_371\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"34\" class=\"wp-image-23827\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_372-21.png\" alt=\"IMG_372\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"34\" class=\"wp-image-23828\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_373-20.png\" alt=\"IMG_373\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"34\" class=\"wp-image-23829\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_374-19.png\" alt=\"IMG_374\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"34\" class=\"wp-image-23830\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_375-19.png\" alt=\"IMG_375\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"129\" height=\"34\" class=\"wp-image-23831\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_376-18.png\" alt=\"IMG_376\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"34\" class=\"wp-image-23832\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_377-17.png\" alt=\"IMG_377\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_377-17.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_377-17-50x34.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"143\" height=\"34\" class=\"wp-image-23833\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_378-16.png\" alt=\"IMG_378\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"34\" class=\"wp-image-23834\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_379-16.png\" alt=\"IMG_379\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"140\" height=\"34\" class=\"wp-image-23835\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_380-16.png\" alt=\"IMG_380\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"34\" class=\"wp-image-23836\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_381-16.png\" alt=\"IMG_381\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"143\" height=\"34\" class=\"wp-image-23837\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_382-16.png\" alt=\"IMG_382\" \/><br \/>\nQua g\u1ed1c <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-23838\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_383-16.png\" alt=\"IMG_383\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"154\" height=\"34\" class=\"wp-image-23839\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_384-16.png\" alt=\"IMG_384\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_384-16.png 154w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_384-16-150x34.png 150w\" sizes=\"(max-width: 154px) 100vw, 154px\" \/><\/p>\n<h2><strong>C \u2013 B\u00c0I T\u1eacP TR\u1eaeC NGHI\u1ec6M<\/strong><\/h2>\n<p><strong>C\u00e2u 1: <\/strong>Cho 4 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"326\" height=\"34\" class=\"wp-image-23840\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_385-16.png\" alt=\"IMG_385\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_385-16.png 326w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_385-16-300x31.png 300w\" sizes=\"(max-width: 326px) 100vw, 326px\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"24\" class=\"wp-image-23841\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_386-16.png\" alt=\"IMG_386\" \/> l\u00e0:<\/p>\n<p><strong>A. <\/strong>T\u1ee9 di\u1ec7n. <strong>B. <\/strong>H\u00ecnh ch\u00f3p \u0111\u1ec1u.<\/p>\n<p><strong>C. <\/strong>T\u1ee9 di\u1ec7n \u0111\u1ec1u. <strong>D. <\/strong>H\u00ecnh thang vu\u00f4ng<\/p>\n<p><strong>C\u00e2u 2: <\/strong>Cho b\u1ed1n \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"326\" height=\"34\" class=\"wp-image-23842\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_387-14.png\" alt=\"IMG_387\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_387-14.png 326w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_387-14-300x31.png 300w\" sizes=\"(max-width: 326px) 100vw, 326px\" \/> G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"27\" class=\"wp-image-23843\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_388-12.png\" alt=\"IMG_388\" \/> l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"66\" height=\"27\" class=\"wp-image-23844\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_389-10.png\" alt=\"IMG_389\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"27\" class=\"wp-image-23845\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_390-11.png\" alt=\"IMG_390\" \/> Khi \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23846\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_391-10.png\" alt=\"IMG_391\" \/> l\u00e0:<\/p>\n<p><strong>A. <\/strong>H\u00ecnh ch\u00f3p. <strong>B. <\/strong>H\u00ecnh ch\u00f3p \u0111\u1ec1u. <strong>C. <\/strong>T\u1ee9 di\u1ec7n \u0111\u1ec1u. <strong>D. <\/strong>Tam di\u1ec7n vu\u00f4ng<\/p>\n<p><strong>C\u00e2u 3: <\/strong>Cho b\u1ed1n \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"326\" height=\"34\" class=\"wp-image-23847\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_392-11.png\" alt=\"IMG_392\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_392-11.png 326w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_392-11-300x31.png 300w\" sizes=\"(max-width: 326px) 100vw, 326px\" \/> X\u00e1c \u0111\u1ecbnh t\u1ecda \u0111\u1ed9 tr\u1ecdng t\u00e2m G c\u1ee7a h\u00ecnh ch\u00f3p <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"24\" class=\"wp-image-23848\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_393-11.png\" alt=\"IMG_393\" \/><\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"34\" class=\"wp-image-23849\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_394-11.png\" alt=\"IMG_394\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"84\" height=\"56\" class=\"wp-image-23850\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_395-11.png\" alt=\"IMG_395\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"76\" height=\"56\" class=\"wp-image-23851\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_396-11.png\" alt=\"IMG_396\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"91\" height=\"56\" class=\"wp-image-23852\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_397-11.png\" alt=\"IMG_397\" \/><\/p>\n<p><strong>C\u00e2u 4: <\/strong>Cho 3 vect\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"331\" height=\"35\" class=\"wp-image-23853\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_398-12.png\" alt=\"IMG_398\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_398-12.png 331w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_398-12-300x32.png 300w\" sizes=\"(max-width: 331px) 100vw, 331px\" \/> X\u00e1c \u0111\u1ecbnh vec t\u01a1 <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"30\" class=\"wp-image-23854\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_399-12.png\" alt=\"IMG_399\" \/> th\u1ecfa m\u00e3n <img loading=\"lazy\" decoding=\"async\" width=\"190\" height=\"31\" class=\"wp-image-23855\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_400-12.png\" alt=\"IMG_400\" \/><\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"34\" class=\"wp-image-23856\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_401-12.png\" alt=\"IMG_401\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"87\" height=\"34\" class=\"wp-image-23857\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_402-12.png\" alt=\"IMG_402\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"56\" class=\"wp-image-23858\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_403-12.png\" alt=\"IMG_403\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"72\" height=\"56\" class=\"wp-image-23859\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_404-12.png\" alt=\"IMG_404\" \/> .<\/p>\n<p><strong>C\u00e2u 5: <\/strong>Trong kh\u00f4ng gian Oxyz, cho \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"287\" height=\"34\" class=\"wp-image-23860\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_405-12.png\" alt=\"IMG_405\" \/> . \u0110i\u1ec3m D trong m\u1eb7t ph\u1eb3ng (Oyz) c\u00f3 cao \u0111\u1ed9 \u00e2m sao cho th\u1ec3 t\u00edch c\u1ee7a kh\u1ed1i t\u1ee9 di\u1ec7n ABCD b\u1eb1ng 2 v\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb D \u0111\u1ebfn m\u1eb7t ph\u1eb3ng (Oxy) b\u1eb1ng 1 c\u00f3 th\u1ec3 l\u00e0:<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"34\" class=\"wp-image-23861\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_406-12.png\" alt=\"IMG_406\" \/> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"91\" height=\"34\" class=\"wp-image-23862\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_407-12.png\" alt=\"IMG_407\" \/> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"34\" class=\"wp-image-23863\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_408-12.png\" alt=\"IMG_408\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"91\" height=\"34\" class=\"wp-image-23864\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_409-12.png\" alt=\"IMG_409\" \/><\/p>\n<p><strong>C\u00e2u 6: <\/strong>Trong kh\u00f4ng gian v\u1edbi h\u1ec7 t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"27\" class=\"wp-image-23865\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_410-12.png\" alt=\"IMG_410\" \/> , cho ba \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"34\" class=\"wp-image-23866\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_411-12.png\" alt=\"IMG_411\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"34\" class=\"wp-image-23867\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_412-12.png\" alt=\"IMG_412\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"93\" height=\"34\" class=\"wp-image-23868\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_413-12.png\" alt=\"IMG_413\" \/> . T\u00ecm t\u1ecda \u0111\u1ed9 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-23869\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_414-12.png\" alt=\"IMG_414\" \/> sao cho <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23870\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_415-12.png\" alt=\"IMG_415\" \/> l\u00e0 h\u00ecnh thang c\u00f3 hai c\u1ea1nh \u0111\u00e1y <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"23\" class=\"wp-image-23871\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_416-12.png\" alt=\"IMG_416\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"24\" class=\"wp-image-23872\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_417-12.png\" alt=\"IMG_417\" \/> v\u00e0 c\u00f3 g\u00f3c <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-23873\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_418-12.png\" alt=\"IMG_418\" \/> b\u1eb1ng <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"24\" class=\"wp-image-23874\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_419-11.png\" alt=\"IMG_419\" \/><\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"34\" class=\"wp-image-23875\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_420-11.png\" alt=\"IMG_420\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"34\" class=\"wp-image-23876\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_421-11.png\" alt=\"IMG_421\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"86\" height=\"34\" class=\"wp-image-23877\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_422-11.png\" alt=\"IMG_422\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"83\" height=\"34\" class=\"wp-image-23878\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_423-11.png\" alt=\"IMG_423\" \/> .<\/p>\n<p><strong>C\u00e2u 7: <\/strong>Trong kh\u00f4ng gian v\u1edbi h\u1ec7 t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"27\" class=\"wp-image-23879\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_424-11.png\" alt=\"IMG_424\" \/> , cho h\u00ecnh h\u1ed9p ch\u1eef nh\u1eadt <img loading=\"lazy\" decoding=\"async\" width=\"137\" height=\"24\" class=\"wp-image-23880\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_425-11.png\" alt=\"IMG_425\" \/> c\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-23881\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_426-11.png\" alt=\"IMG_426\" \/> tr\u00f9ng v\u1edbi g\u1ed1c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"24\" class=\"wp-image-23882\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_427-11.png\" alt=\"IMG_427\" \/> , c\u00e1c \u0111\u1ec9nh <img loading=\"lazy\" decoding=\"async\" width=\"83\" height=\"27\" class=\"wp-image-23883\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_428-11.png\" alt=\"IMG_428\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"86\" height=\"27\" class=\"wp-image-23884\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_429-11.png\" alt=\"IMG_429\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"83\" height=\"27\" class=\"wp-image-23885\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_430-10.png\" alt=\"IMG_430\" \/> v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"27\" class=\"wp-image-23886\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_431-9.png\" alt=\"IMG_431\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"24\" class=\"wp-image-23887\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_432-9.png\" alt=\"IMG_432\" \/> . G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"23\" class=\"wp-image-23888\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_433-9.png\" alt=\"IMG_433\" \/> l\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u1ea1nh <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"24\" class=\"wp-image-23889\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_434-9.png\" alt=\"IMG_434\" \/> . Khi \u0111\u00f3 th\u1ec3 t\u00edch t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"23\" class=\"wp-image-23890\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_435-9.png\" alt=\"IMG_435\" \/> \u0111\u1ea1t gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t b\u1eb1ng<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"52\" class=\"wp-image-23891\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_436-9.png\" alt=\"IMG_436\" \/> . <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"52\" class=\"wp-image-23892\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_437-10.png\" alt=\"IMG_437\" \/> . <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"31\" height=\"52\" class=\"wp-image-23893\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_438-10.png\" alt=\"IMG_438\" \/> . <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"28\" height=\"52\" class=\"wp-image-23894\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_439-10.png\" alt=\"IMG_439\" \/> .<\/p>\n<p><strong>C\u00e2u 8: <\/strong>Cho ba \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"267\" height=\"34\" class=\"wp-image-23895\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_440-10.png\" alt=\"IMG_440\" \/> . N\u1ebfu tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"24\" class=\"wp-image-23896\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_441-10.png\" alt=\"IMG_441\" \/> th\u1ecfa m\u00e3n h\u1ec7 th\u1ee9c <img loading=\"lazy\" decoding=\"async\" width=\"164\" height=\"28\" class=\"wp-image-23897\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_442-10.png\" alt=\"IMG_442\" \/> th\u00ec c\u00f3 t\u1ecda \u0111\u1ed9 tr\u1ecdng t\u00e2m l\u00e0:<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"34\" class=\"wp-image-23898\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_443-8.png\" alt=\"IMG_443\" \/> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"83\" height=\"34\" class=\"wp-image-23899\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_444-8.png\" alt=\"IMG_444\" \/> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"34\" class=\"wp-image-23900\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_445-8.png\" alt=\"IMG_445\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"34\" class=\"wp-image-23901\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_446-7.png\" alt=\"IMG_446\" \/><\/p>\n<p><strong>C\u00e2u 9: <\/strong>Trong kh\u00f4ng gian v\u1edbi h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"27\" class=\"wp-image-23902\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_447-7.png\" alt=\"IMG_447\" \/> , cho ba \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"267\" height=\"34\" class=\"wp-image-23903\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_448-7.png\" alt=\"IMG_448\" \/> . Bi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"192\" height=\"34\" class=\"wp-image-23904\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_449-6.png\" alt=\"IMG_449\" \/> , th\u1ec3 t\u00edch t\u1ee9 di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"63\" height=\"24\" class=\"wp-image-23905\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_450-6.png\" alt=\"IMG_450\" \/> b\u1eb1ng 3. Gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c <img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"31\" class=\"wp-image-23906\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_451-6.png\" alt=\"IMG_451\" \/> b\u1eb1ng<\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"31\" height=\"24\" class=\"wp-image-23907\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_452-6.png\" alt=\"IMG_452\" \/> <strong>B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"31\" height=\"24\" class=\"wp-image-23908\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_453-6.png\" alt=\"IMG_453\" \/> <strong>C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"31\" height=\"24\" class=\"wp-image-23909\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_454-6.png\" alt=\"IMG_454\" \/> <strong>D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"31\" height=\"24\" class=\"wp-image-23910\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_455-5.png\" alt=\"IMG_455\" \/><\/p>\n<p><strong>C\u00e2u 10: <\/strong>Cho h\u00ecnh ch\u00f3p <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"24\" class=\"wp-image-23911\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_456-5.png\" alt=\"IMG_456\" \/> bi\u1ebft <img loading=\"lazy\" decoding=\"async\" width=\"360\" height=\"34\" class=\"wp-image-23912\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_457-5.png\" alt=\"IMG_457\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_457-5.png 360w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_457-5-300x28.png 300w\" sizes=\"(max-width: 360px) 100vw, 360px\" \/> . G\u1ecdi <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"23\" class=\"wp-image-23913\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_458-5.png\" alt=\"IMG_458\" \/> l\u00e0 trung \u0111i\u1ec3m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"27\" class=\"wp-image-23914\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_459-5.png\" alt=\"IMG_459\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"126\" height=\"34\" class=\"wp-image-23915\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_460-5.png\" alt=\"IMG_460\" \/> . \u0110\u1ec3 kh\u1ed1i ch\u00f3p <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"24\" class=\"wp-image-23916\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_461-5.png\" alt=\"IMG_461\" \/> c\u00f3 th\u1ec3 t\u00edch b\u1eb1ng <img loading=\"lazy\" decoding=\"async\" width=\"31\" height=\"52\" class=\"wp-image-23917\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_462-4.png\" alt=\"IMG_462\" \/> (\u0111vtt) th\u00ec c\u00f3 hai \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"31\" class=\"wp-image-23918\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_463-4.png\" alt=\"IMG_463\" \/> th\u1ecfa m\u00e3n y\u00eau c\u1ea7u b\u00e0i to\u00e1n. T\u00ecm t\u1ecda \u0111\u1ed9 trung \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"23\" class=\"wp-image-23919\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_464-4.png\" alt=\"IMG_464\" \/> c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"38\" height=\"31\" class=\"wp-image-23920\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_465-4.png\" alt=\"IMG_465\" \/><\/p>\n<p><strong>A. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"97\" height=\"34\" class=\"wp-image-23921\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_466-4.png\" alt=\"IMG_466\" \/><strong>. B. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"34\" class=\"wp-image-23922\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_467-4.png\" alt=\"IMG_467\" \/><strong> C. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"34\" class=\"wp-image-23923\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_468-4.png\" alt=\"IMG_468\" \/><strong>. D. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"104\" height=\"34\" class=\"wp-image-23924\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_469-4.png\" alt=\"IMG_469\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A &#8211; L\u00dd THUY\u1ebeT CHUNG 1. V\u00e9c t\u01a1 trong kh\u00f4ng gian * \u0110\u1ecbnh ngh\u0129a Trong kh\u00f4ng gian, vecto l\u00e0 m\u1ed9t \u0111o\u1ea1n th\u1eb3ng c\u00f3 \u0111\u1ecbnh h\u01b0\u1edbng t\u1ee9c l\u00e0 \u0111o\u1ea1n th\u1eb3ng c\u00f3 quy \u0111\u1ecbnh th\u1ee9 t\u1ef1 c\u1ee7a hai \u0111\u1ea7u \u00fc Ch\u00fa \u00fd: C\u00e1c \u0111\u1ecbnh ngh\u0129a v\u1ec1 hai vecto b\u1eb1ng nhau, \u0111\u1ed1i nhau v\u00e0 c\u00e1c ph\u00e9p to\u00e1n tr\u00ean [&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":[43],"tags":[],"class_list":["post-23710","post","type-post","status-publish","format-standard","hentry","category-toan-lop-12"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/23710","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=23710"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/23710\/revisions"}],"predecessor-version":[{"id":23925,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/23710\/revisions\/23925"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=23710"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=23710"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=23710"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}