{"id":24393,"date":"2021-12-17T17:21:18","date_gmt":"2021-12-17T10:21:18","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=24393"},"modified":"2021-12-17T17:21:19","modified_gmt":"2021-12-17T10:21:19","slug":"khao-sat-su-bien-thien-va-ve-do-thi-cua-ham-so","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/khao-sat-su-bien-thien-va-ve-do-thi-cua-ham-so\/","title":{"rendered":"KH\u1ea2O S\u00c1T S\u1ef0 BI\u1ebeN THI\u00caN V\u00c0 V\u1ebc \u0110\u1ed2 TH\u1eca C\u1ee6A H\u00c0M S\u1ed0"},"content":{"rendered":"\n<p><\/p>\n\n\n<p><a id=\"post-24393-_Toc493273876\"><\/a><a id=\"post-24393-_Toc492701526\"><\/a><strong>A. CHU\u1ea8N KI\u1ebeN TH\u1ee8C<\/strong><\/p>\n<p><strong>S\u01a0 \u0110\u1ed2 KH\u1ea2O S\u00c1T H\u00c0M S\u1ed0 <\/strong><\/p>\n<p><strong> 1. T\u1eadp x\u00e1c \u0111\u1ecbnh <\/strong><\/p>\n<p>T\u00ecm t\u1eadp x\u00e1c \u0111\u1ecbnh c\u1ee7a h\u00e0m s\u1ed1<\/p>\n<p><strong>2.<\/strong> <strong>S\u1ef1 bi\u1ebfn thi\u00ean<\/strong><\/p>\n<p>* X\u00e9t chi\u1ec1u bi\u1ebfn thi\u00ean c\u1ee7a h\u00e0m s\u1ed1 :<\/p>\n<p>+ T\u00ednh \u0111\u1ea1o h\u00e0m y\u2019;<\/p>\n<p>+ T\u00ecm c\u00e1c \u0111i\u1ec3m t\u1ea1i \u0111\u00f3 \u0111\u1ea1o h\u00e0m y\u2019 b\u1eb1ng 0 ho\u1eb7c kh\u00f4ng x\u00e1c \u0111\u1ecbnh ;<\/p>\n<p>+ X\u00e9t d\u1ea5u \u0111\u1ea1o h\u00e0m y\u2019 v\u00e0 suy ra chi\u1ec1u bi\u1ebfn thi\u00ean c\u1ee7a h\u00e0m s\u1ed1<\/p>\n<p>* T\u00ecm c\u1ef1c tr\u1ecb<\/p>\n<p>* T\u00ecm c\u00e1c gi\u1edbi h\u1ea1n t\u1ea1i v\u00f4 c\u1ef1c ,c\u00e1c gi\u1edbi h\u1ea1n v\u00f4 c\u1ef1c v\u00e0 t\u00ecm ti\u1ec7m c\u1eadn (n\u1ebfu c\u00f3 )<\/p>\n<p>* L\u1eadp b\u1ea3ng bi\u1ebfn thi\u00ean. (Ghi c\u00e1c k\u1ebft qu\u1ea3 t\u00ecm \u0111\u01b0\u1ee3c v\u00e0o b\u1ea3ng bi\u1ebfn thi\u00ean )<\/p>\n<p><strong>3. T\u00ecm c\u00e1c kho\u1ea3ng l\u1ed3i ,l\u00f5m v\u00e0 \u0111i\u1ec3m u\u1ed1n c\u1ee7a \u0111\u1ed3 th\u1ecb h\u00e0m <\/strong>(b\u01b0\u1edbc n\u00e0y ch\u1ec9 th\u1ef1c hi\u1ec7n v\u1edbi h\u00e0m b\u1eadc ba )<\/p>\n<p>+ T\u00ednh y\u2019\u2019<\/p>\n<p>+ Gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh y\u2019\u2019=0<\/p>\n<p>+ L\u1eadp b\u1ea3ng x\u00e9t d\u1ea5u y\u2019\u2019<\/p>\n<p><strong>4. \u0110\u1ed3 th\u1ecb <\/strong><\/p>\n<p>D\u1ef1a v\u00e0o b\u1ea3ng bi\u1ebfn thi\u00ean v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 x\u00e1c \u0111\u1ecbnh \u1edf tr\u00ean \u0111\u1ec3 v\u1ebd<\/p>\n<p><strong><em>CH\u00da \u00dd.<\/em><\/strong><\/p>\n<ul>\n<li>\n<ol>\n<li>N\u1ebfu h\u00e0m s\u1ed1 tu\u1ea7n ho\u00e0n v\u1edbi chu k\u00ec T th\u00ec ch\u1ec9 c\u1ea7n kh\u1ea3o s\u00e1t s\u1ef1 bi\u1ebfn thi\u00ean v\u00e0 v\u1ebd \u0111\u1ed3 th\u1ecb tr\u00ean m\u1ed9t chu k\u00ec ,sau \u0111\u00f3 t\u1ecbnh ti\u1ebfn \u0111\u1ed3 th\u1ecb song song v\u1edbi tr\u1ee5c Ox<\/li>\n<li>N\u00ean t\u00ednh th\u00eam to\u1ea1 \u0111\u1ed9 m\u1ed9t s\u1ed1 \u0111i\u1ec3m ,\u0111\u1eb7c bi\u1ec7t l\u00e0 giao \u0111i\u1ec3m c\u1ee7a \u0111\u1ed3 th\u1ecb v\u1edbi c\u00e1c tr\u1ee5c to\u1ea1 \u0111\u1ed9<\/li>\n<li>N\u00ean l\u01b0u \u00fd \u0111\u1ebfn t\u00ednh \u0111\u1ed1i x\u1ee9ng c\u1ee7a \u0111\u1ed3 th\u1ecb \u0111\u1ec3 v\u1ebd cho ch\u00ednh x\u00e1c<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<p><strong>B. LUY\u1ec6N K\u0128 N\u0102NG GI\u1ea2I C\u00c1C D\u1ea0NG B\u00c0I T\u1eacP.<\/strong><\/p>\n<p><strong>H\u00c0M S\u1ed0 B\u1eacC BA : <\/strong> <img decoding=\"async\" width=\"167\" height=\"32\" class=\"wp-image-24394\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-44.png\" alt=\"IMG_256\" \/><\/p>\n<p><strong>1<\/strong>. T\u1eadp x\u00e1c \u0111\u1ecbnh: <img decoding=\"async\" width=\"54\" height=\"20\" class=\"wp-image-24395\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-43.png\" alt=\"IMG_257\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_257-43.png 54w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_257-43-50x20.png 50w\" sizes=\"(max-width: 54px) 100vw, 54px\" \/><\/p>\n<p><strong>2<\/strong>. \u0110\u1ea1o h\u00e0m: <img decoding=\"async\" width=\"145\" height=\"32\" class=\"wp-image-24396\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-44.png\" alt=\"IMG_258\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"100\" height=\"29\" class=\"wp-image-24397\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-41.png\" alt=\"IMG_259\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"22\" class=\"wp-image-24398\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-43.png\" alt=\"IMG_260\" \/> : H\u00e0m s\u1ed1 c\u00f3 2 c\u1ef1c tr\u1ecb.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"22\" class=\"wp-image-24399\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-41.png\" alt=\"IMG_261\" \/> : H\u00e0m s\u1ed1 lu\u00f4n t\u0103ng ho\u1eb7c lu\u00f4n gi\u1ea3m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"20\" class=\"wp-image-24400\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-42.png\" alt=\"IMG_262\" \/> .<\/p>\n<p><strong>3<\/strong>. \u0110\u1ea1o h\u00e0m c\u1ea5p 2: <img loading=\"lazy\" decoding=\"async\" width=\"105\" height=\"25\" class=\"wp-image-24401\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-43.png\" alt=\"IMG_263\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"137\" height=\"49\" class=\"wp-image-24402\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-42.png\" alt=\"IMG_264\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"49\" class=\"wp-image-24403\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-42.png\" alt=\"IMG_265\" \/> l\u00e0 ho\u00e0nh \u0111\u1ed9 \u0111i\u1ec3m u\u1ed1n, \u0111\u1ed3 th\u1ecb nh\u1eadn \u0111i\u1ec3m u\u1ed1n l\u00e0m t\u00e2m \u0111\u1ed1i x\u1ee9ng.<\/p>\n<p><strong>4<\/strong>. Gi\u1edbi h\u1ea1n: N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24404\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-42.png\" alt=\"IMG_266\" \/> th\u00ec: <img loading=\"lazy\" decoding=\"async\" width=\"195\" height=\"37\" class=\"wp-image-24405\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-43.png\" alt=\"IMG_267\" \/><\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24406\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-43.png\" alt=\"IMG_268\" \/> th\u00ec: <img loading=\"lazy\" decoding=\"async\" width=\"195\" height=\"37\" class=\"wp-image-24407\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-43.png\" alt=\"IMG_269\" \/><\/p>\n<p><strong>5<\/strong>. B\u1ea3ng bi\u1ebfn thi\u00ean v\u00e0 \u0111\u1ed3 th\u1ecb:<\/p>\n<p><strong><em>Tr\u01b0\u1eddng h\u1ee3p<\/em><\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24408\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-41.png\" alt=\"IMG_270\" \/> :<\/p>\n<p>* <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"29\" class=\"wp-image-24409\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-43.png\" alt=\"IMG_271\" \/> : H\u00e0m s\u1ed1 c\u00f3 2 c\u1ef1c tr\u1ecb<\/p>\n<p>* <img loading=\"lazy\" decoding=\"async\" width=\"252\" height=\"32\" class=\"wp-image-24410\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-43.png\" alt=\"IMG_272\" \/> : H\u00e0m s\u1ed1 lu\u00f4n t\u0103ng tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"20\" class=\"wp-image-24411\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-41.png\" alt=\"IMG_273\" \/> .<\/p>\n<p><strong><em> Tr\u01b0\u1eddng h\u1ee3p <\/em><\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24412\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-42.png\" alt=\"IMG_274\" \/> :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"166\" height=\"166\" class=\"wp-image-24413\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-41.png\" alt=\"IMG_275\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_275-41.png 166w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_275-41-150x150.png 150w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_275-41-50x50.png 50w\" sizes=\"(max-width: 166px) 100vw, 166px\" \/> * <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"29\" class=\"wp-image-24414\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-42.png\" alt=\"IMG_276\" \/> : H\u00e0m s\u1ed1 c\u00f3 2 c\u1ef1c tr\u1ecb.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"166\" height=\"166\" class=\"wp-image-24415\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-42.png\" alt=\"IMG_277\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_277-42.png 166w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_277-42-150x150.png 150w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_277-42-50x50.png 50w\" sizes=\"(max-width: 166px) 100vw, 166px\" \/> * <img loading=\"lazy\" decoding=\"async\" width=\"252\" height=\"32\" class=\"wp-image-24416\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-43.png\" alt=\"IMG_278\" \/> : H\u00e0m s\u1ed1 lu\u00f4n gi\u1ea3m tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"22\" height=\"20\" class=\"wp-image-24417\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-41.png\" alt=\"IMG_279\" \/> .<\/p>\n<p><strong>M\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t c\u1ee7a h\u00e0m s\u1ed1 b\u1eadc ba<\/strong><\/p>\n<p><strong>1<\/strong>. H\u00e0m s\u1ed1 c\u00f3 c\u1ef1c \u0111\u1ea1i v\u00e0 c\u1ef1c ti\u1ec3u khi v\u00e0 ch\u1ec9 khi: <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"29\" class=\"wp-image-24418\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-43.png\" alt=\"IMG_280\" \/> .<\/p>\n<p><strong>2<\/strong>. H\u00e0m s\u1ed1 lu\u00f4n \u0111\u1ed3ng bi\u1ebfn tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"179\" height=\"62\" class=\"wp-image-24419\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-42.png\" alt=\"IMG_281\" \/><\/p>\n<p><strong>3<\/strong>. H\u00e0m s\u1ed1 lu\u00f4n ngh\u1ecbch bi\u1ebfn tr\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"179\" height=\"62\" class=\"wp-image-24420\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-43.png\" alt=\"IMG_282\" \/><\/p>\n<p><strong>4<\/strong>. \u0110\u1ec3 t\u00ecm gi\u00e1 c\u1ef1c tr\u1ecb ta l\u1ea5y <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"25\" class=\"wp-image-24421\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-42.png\" alt=\"IMG_283\" \/> chia cho <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"25\" class=\"wp-image-24422\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-42.png\" alt=\"IMG_284\" \/> : <img loading=\"lazy\" decoding=\"async\" width=\"177\" height=\"25\" class=\"wp-image-24423\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-43.png\" alt=\"IMG_285\" \/><\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"29\" class=\"wp-image-24424\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-42.png\" alt=\"IMG_286\" \/> l\u00e0 hai nghi\u1ec7m c\u1ee7a <img loading=\"lazy\" decoding=\"async\" width=\"39\" height=\"25\" class=\"wp-image-24425\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-43.png\" alt=\"IMG_287\" \/> th\u00ec: <img loading=\"lazy\" decoding=\"async\" width=\"229\" height=\"29\" class=\"wp-image-24426\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-43.png\" alt=\"IMG_288\" \/><\/p>\n<p>Khi \u0111\u00f3 \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua c\u00e1c \u0111i\u1ec3m c\u1ef1c tr\u1ecb l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"77\" height=\"22\" class=\"wp-image-24427\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-44.png\" alt=\"IMG_289\" \/> .<\/p>\n<p><strong>5<\/strong>. \u0110\u1ed3 th\u1ecb lu\u00f4n c\u00f3 \u0111i\u1ec3m u\u1ed1n I v\u00e0 l\u00e0 t\u00e2m \u0111\u1ed1i x\u1ee9ng c\u1ee7a \u0111\u1ed3 th\u1ecb.<\/p>\n<p><strong>6<\/strong>. \u0110\u1ed3 th\u1ecb c\u1eaft Ox t\u1ea1i 3 \u0111i\u1ec3m ph\u00e2n bi\u1ec7t <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"19\" class=\"wp-image-24428\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-43.png\" alt=\"IMG_290\" \/> h\u00e0m s\u1ed1 c\u00f3 hai c\u1ef1c tr\u1ecb tr\u00e1i d\u1ea5u nhau.<\/p>\n<p><strong>7<\/strong>. \u0110\u1ed3 th\u1ecb c\u1eaft Ox t\u1ea1i hai \u0111i\u1ec3m ph\u00e2n bi\u1ec7t <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"19\" class=\"wp-image-24429\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-42.png\" alt=\"IMG_291\" \/> \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1 c\u00f3 hai c\u1ef1c tr\u1ecb v\u00e0 m\u1ed9t c\u1ef1c tr\u1ecb n\u1eb1m tr\u00ean Ox.<\/p>\n<p><strong>8<\/strong>. \u0110\u1ed3 th\u1ecb c\u1eaft Ox t\u1ea1i m\u1ed9t \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"25\" height=\"19\" class=\"wp-image-24430\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-43.png\" alt=\"IMG_292\" \/> ho\u1eb7c h\u00e0m s\u1ed1 kh\u00f4ng c\u00f3 c\u1ef1c tr\u1ecb ho\u1eb7c h\u00e0m s\u1ed1 c\u00f3 hai c\u1ef1c tr\u1ecb c\u00f9ng d\u1ea5u.<\/p>\n<p><strong>9<\/strong>. Ti\u00ea\u0301p tuy\u00ea\u0301n: Go\u0323i I la\u0300 \u0111i\u00ea\u0309m u\u00f4\u0301n. Cho <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"25\" class=\"wp-image-24431\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-43.png\" alt=\"IMG_293\" \/><\/p>\n<p>* N\u00ea\u0301u <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"22\" class=\"wp-image-24432\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-42.png\" alt=\"IMG_294\" \/> thi\u0300 ta co\u0301 \u0111u\u0301ng m\u00f4\u0323t ti\u00ea\u0301p tuy\u00ea\u0301n \u0111i qua <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"22\" class=\"wp-image-24433\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-41.png\" alt=\"IMG_295\" \/> v\u00e0 ti\u1ebfp tuy\u1ebfn n\u00e0y c\u00f3 h\u1ec7 s\u1ed1 g\u00f3c nh\u1ecf nh\u1ea5t ( n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24434\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-41.png\" alt=\"IMG_296\" \/> ), l\u1edbn nh\u1ea5t (n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24435\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-41.png\" alt=\"IMG_297\" \/> ).<\/p>\n<p>* N\u00ea\u0301u <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"22\" class=\"wp-image-24436\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-41.png\" alt=\"IMG_298\" \/> kha\u0301c <em>I<\/em> thi\u0300 co\u0301 \u0111u\u0301ng 2 ti\u00ea\u0301p tuy\u00ea\u0301n \u0111i qua <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"22\" class=\"wp-image-24437\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-42.png\" alt=\"IMG_299\" \/> .<\/p>\n<p><strong>C\u00e1c v\u00ed d\u1ee5<\/strong><\/p>\n<p><strong>V\u00ed d\u1ee5 1. <\/strong>Kh\u1ea3o s\u00e1t s\u1ef1 bi\u1ebfn thi\u00ean v\u00e0 v\u1ebd \u0111\u1ed3 th\u1ecb ( C ) c\u1ee7a h\u00e0m s\u1ed1:<\/p>\n<p><strong>1. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"137\" height=\"32\" class=\"wp-image-24438\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-42.png\" alt=\"IMG_300\" \/> <strong>2. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"105\" height=\"32\" class=\"wp-image-24439\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-42.png\" alt=\"IMG_301\" \/> <strong>3. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"147\" height=\"49\" class=\"wp-image-24440\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-42.png\" alt=\"IMG_302\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i.<\/strong><\/p>\n<p>1. T\u1eadp x\u00e1c \u0111\u1ecbnh : <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"20\" class=\"wp-image-24441\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-42.png\" alt=\"IMG_303\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_303-42.png 54w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_303-42-50x20.png 50w\" sizes=\"(max-width: 54px) 100vw, 54px\" \/><\/p>\n<ul>\n<li>Chi\u1ec1u bi\u1ebfn thi\u00ean :\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"212\" height=\"35\" class=\"wp-image-24442\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-42.png\" alt=\"IMG_304\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"240\" height=\"32\" class=\"wp-image-24443\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-42.png\" alt=\"IMG_305\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"20\" class=\"wp-image-24444\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-42.png\" alt=\"IMG_306\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>H\u00e0m s\u1ed1 ngh\u1ecbch bi\u1ebfn tr\u00ean c\u00e1c kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24445\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-42.png\" alt=\"IMG_307\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24446\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-42.png\" alt=\"IMG_308\" \/> , \u0111\u1ed3ng bi\u1ebfn tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"32\" class=\"wp-image-24447\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-41.png\" alt=\"IMG_309\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_309-41.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_309-41-50x32.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> .<\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"20\" class=\"wp-image-24448\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-42.png\" alt=\"IMG_310\" \/> ; gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i c\u1ee7a h\u00e0m s\u1ed1 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24449\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-41.png\" alt=\"IMG_311\" \/> .<\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24450\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-41.png\" alt=\"IMG_312\" \/> ; gi\u00e1 tr\u1ecb c\u1ef1c ti\u1ec3u c\u1ee7a h\u00e0m s\u1ed1 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"32\" class=\"wp-image-24451\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-40.png\" alt=\"IMG_313\" \/><\/p>\n<ul>\n<li>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"249\" height=\"270\" class=\"wp-image-24452\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-40.png\" alt=\"IMG_314\" \/> Gi\u1edbi h\u1ea1n c\u1ee7a h\u00e0m s\u1ed1 t\u1ea1i v\u00f4 c\u1ef1c : <img loading=\"lazy\" decoding=\"async\" width=\"222\" height=\"40\" class=\"wp-image-24453\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-40.png\" alt=\"IMG_315\" \/>\n<ul>\n<li>B\u1ea3ng bi\u1ebfn thi\u00ean :<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td>\n<p><strong>x<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>-\u00a5 0 2 +\u00a5<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>y&#8217;<\/strong><\/p>\n<\/td>\n<td>\n<p><strong> &#8211; 0 + 0 &#8211;<\/strong><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><strong>y<\/strong><\/p>\n<\/td>\n<td>\n<p><strong><img loading=\"lazy\" decoding=\"async\" width=\"325\" height=\"28\" class=\"wp-image-24454\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-40.png\" alt=\"IMG_316\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_316-40.png 325w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_316-40-300x26.png 300w\" sizes=\"(max-width: 325px) 100vw, 325px\" \/>+\u00a5 0<\/strong><\/p>\n<p><strong> -4 -\u00a5<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u0110\u1ed3 th\u1ecb :<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<ul>\n<li>\n<ul>\n<li>Cho <img loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"27\" class=\"wp-image-24455\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-40.png\" alt=\"IMG_317\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<p><strong>2<\/strong>. T\u1eadp x\u00e1c \u0111\u1ecbnh : <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"20\" class=\"wp-image-24456\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-40.png\" alt=\"IMG_318\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_318-40.png 54w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_318-40-50x20.png 50w\" sizes=\"(max-width: 54px) 100vw, 54px\" \/><\/p>\n<ul>\n<li>Chi\u1ec1u bi\u1ebfn thi\u00ean:\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"35\" class=\"wp-image-24457\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-40.png\" alt=\"IMG_319\" \/> ; <img loading=\"lazy\" decoding=\"async\" width=\"240\" height=\"32\" class=\"wp-image-24458\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-40.png\" alt=\"IMG_320\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"20\" class=\"wp-image-24459\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-39.png\" alt=\"IMG_321\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>H\u00e0m s\u1ed1 ngh\u1ecbch bi\u1ebfn tr\u00ean c\u00e1c kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24460\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-39.png\" alt=\"IMG_322\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24461\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-37.png\" alt=\"IMG_323\" \/> , \u0111\u1ed3ng bi\u1ebfn tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"32\" class=\"wp-image-24462\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-37.png\" alt=\"IMG_324\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_324-37.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_324-37-50x32.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> .<\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"20\" class=\"wp-image-24463\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-37.png\" alt=\"IMG_325\" \/> ; gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i c\u1ee7a h\u00e0m s\u1ed1 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24464\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-37.png\" alt=\"IMG_326\" \/><\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24465\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-37.png\" alt=\"IMG_327\" \/> ; gi\u00e1 tr\u1ecb c\u1ef1c ti\u1ec3u c\u1ee7a h\u00e0m s\u1ed1 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"67\" height=\"32\" class=\"wp-image-24466\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-36.png\" alt=\"IMG_328\" \/> .<\/p>\n<ul>\n<li>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"274\" height=\"276\" class=\"wp-image-24467\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329.jpeg\" alt=\"IMG_329\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_329.jpeg 274w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_329-150x150.jpeg 150w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_329-50x50.jpeg 50w\" sizes=\"(max-width: 274px) 100vw, 274px\" \/> Gi\u1edbi h\u1ea1n c\u1ee7a h\u00e0m s\u1ed1 t\u1ea1i v\u00f4 c\u1ef1c: <img loading=\"lazy\" decoding=\"async\" width=\"222\" height=\"40\" class=\"wp-image-24468\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-36.png\" alt=\"IMG_330\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>B\u1ea3ng bi\u1ebfn thi\u00ean:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"417\" height=\"157\" class=\"wp-image-24469\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331.jpeg\" alt=\"IMG_331\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_331.jpeg 417w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_331-300x113.jpeg 300w\" sizes=\"(max-width: 417px) 100vw, 417px\" \/><\/p>\n<ul>\n<li>\u0110\u1ed3 th\u1ecb :<\/li>\n<\/ul>\n<p>Cho <img loading=\"lazy\" decoding=\"async\" width=\"225\" height=\"27\" class=\"wp-image-24470\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-36.png\" alt=\"IMG_332\" \/><\/p>\n<p>3. T\u1eadp x\u00e1c \u0111\u1ecbnh: <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"20\" class=\"wp-image-24471\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-36.png\" alt=\"IMG_333\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_333-36.png 54w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_333-36-50x20.png 50w\" sizes=\"(max-width: 54px) 100vw, 54px\" \/><\/p>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"197\" height=\"295\" class=\"wp-image-24472\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334.jpeg\" alt=\"IMG_334\" \/> Chi\u1ec1u bi\u1ebfn thi\u00ean:\n<ul>\n<li>Gi\u1edbi h\u1ea1n c\u1ee7a h\u00e0m s\u1ed1 t\u1ea1i v\u00f4 c\u1ef1c: <img loading=\"lazy\" decoding=\"async\" width=\"222\" height=\"40\" class=\"wp-image-24473\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-35.png\" alt=\"IMG_335\" \/><\/li>\n<li>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"282\" height=\"39\" class=\"wp-image-24474\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-35.png\" alt=\"IMG_336\" \/><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>H\u00e0m s\u1ed1 \u0111\u1ed3ng bi\u1ebfn tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"32\" class=\"wp-image-24475\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-35.png\" alt=\"IMG_337\" \/> ,<\/p>\n<p>h\u00e0m s\u1ed1 kh\u00f4ng c\u00f3 c\u1ef1c tr\u1ecb .<\/p>\n<ul>\n<li>\n<ul>\n<li>B\u1ea3ng bi\u1ebfn thi\u00ean:<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"390\" height=\"156\" class=\"wp-image-24476\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338.jpeg\" alt=\"IMG_338\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_338.jpeg 390w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_338-300x120.jpeg 300w\" sizes=\"(max-width: 390px) 100vw, 390px\" \/><\/p>\n<ul>\n<li>\u0110\u1ed3 th\u1ecb : Cho <img loading=\"lazy\" decoding=\"async\" width=\"104\" height=\"25\" class=\"wp-image-24477\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-34.png\" alt=\"IMG_339\" \/><\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5 2. <\/strong>Cho h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"142\" height=\"34\" class=\"wp-image-24478\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-34.png\" alt=\"IMG_340\" \/> c\u00f3 \u0111\u1ed3 th\u1ecb ( C )<\/p>\n<p><strong>1. <\/strong> Kh\u1ea3o s\u00e1t s\u1ef1 bi\u1ebfn thi\u00ean v\u00e0 v\u1ebd \u0111\u1ed3 th\u1ecb ( C ) c\u1ee7a h\u00e0m s\u1ed1;<\/p>\n<p><strong>2. <\/strong>Vi\u1ebft ph\u01b0\u01a1ng tr\u00ecnh ti\u1ebfp tuy\u1ebfn c\u1ee7a \u0111\u1ed3 th\u1ecb <em>(C)<\/em> t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"64\" height=\"32\" class=\"wp-image-24479\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-34.png\" alt=\"IMG_341\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i.<\/strong><\/p>\n<p><strong>1. <\/strong>Kh\u1ea3o s\u00e1t s\u1ef1 bi\u1ebfn thi\u00ean v\u00e0 v\u1ebd \u0111\u1ed3 th\u1ecb:<\/p>\n<ul>\n<li>T\u1eadp x\u00e1c \u0111\u1ecbnh: <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"20\" class=\"wp-image-24480\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-34.png\" alt=\"IMG_342\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_342-34.png 54w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_342-34-50x20.png 50w\" sizes=\"(max-width: 54px) 100vw, 54px\" \/><\/li>\n<li>Chi\u1ec1u bi\u1ebfn thi\u00ean :<\/li>\n<\/ul>\n<p>Ta c\u00f3 : <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"35\" class=\"wp-image-24481\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-33.png\" alt=\"IMG_343\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"32\" class=\"wp-image-24482\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-33.png\" alt=\"IMG_344\" \/> ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"20\" class=\"wp-image-24483\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-33.png\" alt=\"IMG_345\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"404\" height=\"32\" class=\"wp-image-24484\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-32.png\" alt=\"IMG_346\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_346-32.png 404w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_346-32-300x24.png 300w\" sizes=\"(max-width: 404px) 100vw, 404px\" \/><\/p>\n<p>H\u00e0m s\u1ed1 ngh\u1ecbch bi\u1ebfn tr\u00ean m\u1ed7i kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24485\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-31.png\" alt=\"IMG_347\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24486\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-30.png\" alt=\"IMG_348\" \/> , \u0111\u1ed3ng bi\u1ebfn tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"52\" height=\"32\" class=\"wp-image-24487\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-30.png\" alt=\"IMG_349\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_349-30.png 52w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_349-30-50x32.png 50w\" sizes=\"(max-width: 52px) 100vw, 52px\" \/> .<\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"20\" class=\"wp-image-24488\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-30.png\" alt=\"IMG_350\" \/> ; gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i c\u1ee7a h\u00e0m s\u1ed1 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"32\" class=\"wp-image-24489\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-30.png\" alt=\"IMG_351\" \/> . H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-24490\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-30.png\" alt=\"IMG_352\" \/> ; gi\u00e1 tr\u1ecb c\u1ef1c ti\u1ec3u c\u1ee7a h\u00e0m s\u1ed1 l\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"32\" class=\"wp-image-24491\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-30.png\" alt=\"IMG_353\" \/><\/p>\n<ul>\n<li>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" width=\"262\" height=\"229\" class=\"wp-image-24492\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-30.png\" alt=\"IMG_354\" \/> Gi\u1edbi h\u1ea1n c\u1ee7a h\u00e0m s\u1ed1 t\u1ea1i v\u00f4 c\u1ef1c : <img loading=\"lazy\" decoding=\"async\" width=\"225\" height=\"40\" class=\"wp-image-24493\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-30.png\" alt=\"IMG_355\" \/><\/li>\n<li>B\u1ea3ng bi\u1ebfn thi\u00ean:<\/li>\n<\/ul>\n<\/li>\n<li>\u0110\u1ed3 th\u1ecb :<\/li>\n<\/ul>\n<p>Cho <em>x<\/em> = -1 \u00de <em>y<\/em> = 5;<\/p>\n<p><em>x<\/em> = 3 \u00de <em>y<\/em> = 1.<\/p>\n<p><strong>2. <\/strong>Ph\u01b0\u01a1ng tr\u00ecnh ti\u1ebfp tuy\u1ebfn c\u1ee7a <em>(C)<\/em> t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"67\" height=\"32\" class=\"wp-image-24494\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-30.png\" alt=\"IMG_357\" \/> c\u00f3 d\u1ea1ng :<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"415\" height=\"32\" class=\"wp-image-24495\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-30.png\" alt=\"IMG_358\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_358-30.png 415w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_358-30-300x23.png 300w\" sizes=\"(max-width: 415px) 100vw, 415px\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>A. CHU\u1ea8N KI\u1ebeN TH\u1ee8C S\u01a0 \u0110\u1ed2 KH\u1ea2O S\u00c1T H\u00c0M S\u1ed0 1. T\u1eadp x\u00e1c \u0111\u1ecbnh T\u00ecm t\u1eadp x\u00e1c \u0111\u1ecbnh c\u1ee7a h\u00e0m s\u1ed1 2. S\u1ef1 bi\u1ebfn thi\u00ean * X\u00e9t chi\u1ec1u bi\u1ebfn thi\u00ean c\u1ee7a h\u00e0m s\u1ed1 : + T\u00ednh \u0111\u1ea1o h\u00e0m y\u2019; + T\u00ecm c\u00e1c \u0111i\u1ec3m t\u1ea1i \u0111\u00f3 \u0111\u1ea1o h\u00e0m y\u2019 b\u1eb1ng 0 ho\u1eb7c kh\u00f4ng x\u00e1c \u0111\u1ecbnh ; [&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-24393","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\/24393","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=24393"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/24393\/revisions"}],"predecessor-version":[{"id":24496,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/24393\/revisions\/24496"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=24393"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=24393"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=24393"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}