{"id":23291,"date":"2021-12-17T16:58:35","date_gmt":"2021-12-17T09:58:35","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=23291"},"modified":"2021-12-17T16:58:37","modified_gmt":"2021-12-17T09:58:37","slug":"cuc-tri-cua-ham-so","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/cuc-tri-cua-ham-so\/","title":{"rendered":"C\u1ef0C TR\u1eca C\u1ee6A H\u00c0M S\u1ed0"},"content":{"rendered":"<p><a id=\"post-23291-_Toc492701526\"><\/a><a id=\"post-23291-_Toc493273876\"><\/a><strong>A. CHU\u1ea8N KI\u1ebeN TH\u1ee8C<\/strong><\/p>\n<p><strong>1. Kh\u00e1i ni\u1ec7m c\u1ef1c tr\u1ecb h\u00e0m s\u1ed1 : <\/strong><\/p>\n<p>Gi\u1ea3 s\u1eed h\u00e0m s\u1ed1 x\u00e1c \u0111\u1ecbnh tr\u00ean t\u1eadp h\u1ee3p <img decoding=\"async\" width=\"85\" height=\"32\" class=\"wp-image-23292\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-37.png\" alt=\"IMG_256\" \/> v\u00e0 <img decoding=\"async\" width=\"55\" height=\"29\" class=\"wp-image-23293\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-36.png\" alt=\"IMG_257\" \/><\/p>\n<p><img decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23294\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-37.png\" alt=\"IMG_258\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t <strong>\u0111i\u1ec3m c\u1ef1c \u0111\u1ea1i<\/strong> c\u1ee7a h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23295\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-35.png\" alt=\"IMG_259\" \/> n\u1ebfu t\u1ed3n t\u1ea1i m\u1ed9t kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"32\" class=\"wp-image-23296\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-37.png\" alt=\"IMG_260\" \/> ch\u1ee9a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23297\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-34.png\" alt=\"IMG_261\" \/> sao cho: <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23298\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-35.png\" alt=\"IMG_262\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"65\" class=\"wp-image-23299\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-36.png\" alt=\"IMG_263\" \/> .<\/p>\n<p>Khi \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"32\" class=\"wp-image-23300\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-35.png\" alt=\"IMG_264\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <strong>gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i<\/strong> c\u1ee7a h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23301\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-35.png\" alt=\"IMG_265\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23302\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-35.png\" alt=\"IMG_266\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t <strong>\u0111i\u1ec3m c\u1ef1c ti\u1ec3u<\/strong> c\u1ee7a h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23303\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-36.png\" alt=\"IMG_267\" \/> n\u1ebfu t\u1ed3n t\u1ea1i m\u1ed9t kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"32\" class=\"wp-image-23304\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-36.png\" alt=\"IMG_268\" \/> ch\u1ee9a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23305\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-36.png\" alt=\"IMG_269\" \/> sao cho: <img loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"65\" class=\"wp-image-23306\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-34.png\" alt=\"IMG_270\" \/> .<\/p>\n<p>Khi \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"32\" class=\"wp-image-23307\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-36.png\" alt=\"IMG_271\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <strong>gi\u00e1 tr\u1ecb c\u1ef1c ti\u1ec3u<\/strong> c\u1ee7a h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23308\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-36.png\" alt=\"IMG_272\" \/> .<\/p>\n<p>Gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i v\u00e0 gi\u00e1 tr\u1ecb c\u1ef1c ti\u1ec3u \u0111\u01b0\u1ee3c g\u1ecdi chung l\u00e0 <strong>c\u1ef1c tr\u1ecb<\/strong><\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23309\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-34.png\" alt=\"IMG_273\" \/> l\u00e0 m\u1ed9t \u0111i\u1ec3m c\u1ef1c tr\u1ecb c\u1ee7a h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23310\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-35.png\" alt=\"IMG_274\" \/> th\u00ec ng\u01b0=\u1eddi ta n\u00f3i r\u1eb1ng h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23311\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-34.png\" alt=\"IMG_275\" \/> \u0111\u1ea1t c\u1ef1c tr\u1ecb t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23312\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-35.png\" alt=\"IMG_276\" \/> .<\/p>\n<p><strong><em>Nh\u01b0 v\u1eady<\/em><\/strong> : \u0110i\u1ec3m c\u1ef1c tr\u1ecb ph\u1ea3i l\u00e0 m\u1ed9t \u0111i\u1ec3m trong c\u1ee7a t\u1eadp h\u1ee3p <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"20\" class=\"wp-image-23313\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-35.png\" alt=\"IMG_277\" \/><\/p>\n<p>\u0110i\u1ec3m c\u1ef1c \u0111\u1ea1i , c\u1ef1c ti\u1ec3u g\u1ecdi chung l\u00e0 \u0111i\u1ec3m c\u1ef1c tr\u1ecb c\u1ee7a h\u00e0m s\u1ed1 , f(x<sub>0<\/sub> ) l\u00e0 gi\u00e1 tr\u1ecb c\u1ef1c tr\u1ecb (hay c\u1ef1c tr\u1ecb ) c\u1ee7a h\u00e0m s\u1ed1.<\/p>\n<p><strong><em>Ch\u00fa \u00fd.<\/em><\/strong><\/p>\n<p><strong><em>a)<\/em><\/strong><em>Gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i (c\u1ef1c ti\u1ec3u ) f(x<sub>0<\/sub>) c\u1ee7a h\u00e0m s\u1ed1 f ch\u01b0a h\u1eb3n \u0111\u00e3 l\u00e0 GTLN (GTNN) c\u1ee7a h\u00e0m s\u1ed1 f tr\u00ean t\u1eadp x\u00e1c \u0111\u1ecbnh D m\u00e0 f(x<sub>0<\/sub>) ch\u1ec9 l\u00e0 GTLN (GTNN) c\u1ee7a h\u00e0m s\u1ed1 f tr\u00ean kho\u1ea3ng (a,b) <\/em> <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"17\" class=\"wp-image-23314\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-36.png\" alt=\"IMG_278\" \/><em>D v\u00e0 (a;b) ch\u1ee9a x<sub>0 <\/sub>.<\/em><\/p>\n<p><strong><em>b)<\/em><\/strong><em>N\u1ebfu f\u2019(x) kh\u00f4ng \u0111\u1ed5i d\u1ea5u tr\u00ean t\u1eadp x\u00e1c \u0111\u1ecbnh D c\u1ee7a h\u00e0m s\u1ed1 f th\u00ec h\u00e0m s\u1ed1 f kh\u00f4ng c\u00f3 c\u1ef1c tr\u1ecb .<\/em><\/p>\n<p><strong>2. \u0110i\u1ec1u ki\u1ec7n c\u1ea7n \u0111\u1ec3 h\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c tr\u1ecb: <\/strong><\/p>\n<p><strong>\u0110\u1ecbnh l\u00fd 1<\/strong>: Gi\u1ea3 s\u1eed h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23315\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-34.png\" alt=\"IMG_279\" \/> \u0111\u1ea1t c\u1ef1c tr\u1ecb t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23316\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-36.png\" alt=\"IMG_280\" \/> . Khi \u0111\u00f3 , n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23317\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-35.png\" alt=\"IMG_281\" \/> c\u00f3 \u0111\u1ea1o h\u00e0m t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23318\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-36.png\" alt=\"IMG_282\" \/> th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"32\" class=\"wp-image-23319\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-35.png\" alt=\"IMG_283\" \/> .<\/p>\n<p><strong>Ch\u00fa \u00fd <\/strong>:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"15\" class=\"wp-image-23320\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-35.png\" alt=\"IMG_284\" \/> \u0110\u1ea1o h\u00e0m <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"20\" class=\"wp-image-23321\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-36.png\" alt=\"IMG_285\" \/><strong><em>c\u00f3 th\u1ec3<\/em><\/strong> tri\u1ec7t ti\u00eau t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23322\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-35.png\" alt=\"IMG_286\" \/> nh\u01b0ng h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23323\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-36.png\" alt=\"IMG_287\" \/> kh\u00f4ng \u0111\u1ea1t c\u1ef1c tr\u1ecb t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23324\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-36.png\" alt=\"IMG_288\" \/> .<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"15\" class=\"wp-image-23325\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-37.png\" alt=\"IMG_289\" \/> H\u00e0m s\u1ed1 <strong><em>c\u00f3 th\u1ec3<\/em><\/strong> \u0111\u1ea1t c\u1ef1c tr\u1ecb t\u1ea1i m\u1ed9t \u0111i\u1ec3m m\u00e0 t\u1ea1i \u0111\u00f3 h\u00e0m s\u1ed1 kh\u00f4ng c\u00f3 \u0111\u1ea1o h\u00e0m<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"15\" class=\"wp-image-23326\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-36.png\" alt=\"IMG_290\" \/> H\u00e0m s\u1ed1 ch\u1ec9 <strong><em>c\u00f3 th\u1ec3<\/em><\/strong> \u0111\u1ea1t c\u1ef1c tr\u1ecb t\u1ea1i m\u1ed9t \u0111i\u1ec3m m\u00e0 t\u1ea1i \u0111\u00f3 \u0111\u1ea1o h\u00e0m c\u1ee7a h\u00e0m s\u1ed1 b\u1eb1ng <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-23327\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-36.png\" alt=\"IMG_291\" \/> , ho\u1eb7c t\u1ea1i \u0111\u00f3 h\u00e0m s\u1ed1 kh\u00f4ng c\u00f3 \u0111\u1ea1o h\u00e0m .<\/p>\n<p><strong>3. \u0110i\u1ec1u ki\u1ec7n \u0111\u1ee7 \u0111\u1ec3 h\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c tr\u1ecb:<\/strong><\/p>\n<p><strong>\u0110\u1ecbnh l\u00fd 2<\/strong>: Gi\u1ea3 s\u1eed h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23328\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-36.png\" alt=\"IMG_292\" \/> li\u00ean t\u1ee5c tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"32\" class=\"wp-image-23329\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-36.png\" alt=\"IMG_293\" \/> ch\u1ee9a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23330\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-35.png\" alt=\"IMG_294\" \/> v\u00e0 c\u00f3 \u0111\u1ea1o h\u00e0m tr\u00ean c\u00e1c kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"32\" class=\"wp-image-23331\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-34.png\" alt=\"IMG_295\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"32\" class=\"wp-image-23332\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-34.png\" alt=\"IMG_296\" \/> . Khi \u0111\u00f3 :<\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"65\" class=\"wp-image-23333\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-34.png\" alt=\"IMG_297\" \/> th\u00ec h\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23334\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-34.png\" alt=\"IMG_298\" \/> .<\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"169\" height=\"65\" class=\"wp-image-23335\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-35.png\" alt=\"IMG_299\" \/> th\u00ec h\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23336\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-35.png\" alt=\"IMG_300\" \/> .<\/p>\n<p><strong>\u0110\u1ecbnh l\u00fd 3<\/strong>: Gi\u1ea3 s\u1eed h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23337\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-35.png\" alt=\"IMG_301\" \/> c\u00f3 \u0111\u1ea1o h\u00e0m c\u1ea5p m\u1ed9t tr\u00ean kho\u1ea3ng <img loading=\"lazy\" decoding=\"async\" width=\"45\" height=\"32\" class=\"wp-image-23338\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-35.png\" alt=\"IMG_302\" \/> ch\u1ee9a \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23339\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-35.png\" alt=\"IMG_303\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"32\" class=\"wp-image-23340\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-35.png\" alt=\"IMG_304\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23341\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-35.png\" alt=\"IMG_305\" \/> c\u00f3 \u0111\u1ea1o h\u00e0m c\u1ea5p hai kh\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"22\" class=\"wp-image-23342\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-35.png\" alt=\"IMG_306\" \/> t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23343\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-35.png\" alt=\"IMG_307\" \/> .<\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"32\" class=\"wp-image-23344\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-35.png\" alt=\"IMG_308\" \/> th\u00ec h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23345\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-34.png\" alt=\"IMG_309\" \/> \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23346\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-35.png\" alt=\"IMG_310\" \/> .<\/p>\n<p>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"32\" class=\"wp-image-23347\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-34.png\" alt=\"IMG_311\" \/> th\u00ec h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23348\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-34.png\" alt=\"IMG_312\" \/> \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23349\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-33.png\" alt=\"IMG_313\" \/> .<\/p>\n<p><strong>Ch\u00fa \u00fd :<\/strong><\/p>\n<p><strong>1. <\/strong>N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23350\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-33.png\" alt=\"IMG_314\" \/> l\u00e0 m\u1ed9t \u0111i\u1ec3m c\u1ef1c tr\u1ecb c\u1ee7a h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23351\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-33.png\" alt=\"IMG_315\" \/> th\u00ec \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"80\" height=\"29\" class=\"wp-image-23352\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-33.png\" alt=\"IMG_316\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 <em>\u0111i\u1ec3m c\u1ef1c tr\u1ecb c\u1ee7a \u0111\u1ed3 th\u1ecb<\/em> h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"14\" height=\"20\" class=\"wp-image-23353\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-33.png\" alt=\"IMG_317\" \/> .<\/p>\n<p><strong>2. <\/strong>Trong tr\u01b0\u1eddng h\u1ee3p <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"30\" class=\"wp-image-23354\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-33.png\" alt=\"IMG_318\" \/> kh\u00f4ng t\u1ed3n t\u1ea1i ho\u1eb7c <img loading=\"lazy\" decoding=\"async\" width=\"96\" height=\"63\" class=\"wp-image-23355\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-33.png\" alt=\"IMG_319\" \/> th\u00ec <strong><em>\u0111\u1ecbnh l\u00fd 3<\/em> <\/strong>kh\u00f4ng d\u00f9ng \u0111\u01b0\u1ee3c.<\/p>\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>D\u1ea1ng 1: T\u00ccM C\u1ef0C TR\u1eca C\u1ee6A H\u00c0M S\u1ed0<\/strong><\/p>\n<p><strong>B\u00e0i to\u00e1n 01: T\u00ccM C\u1ef0C TR\u1eca H\u00c0M S\u1ed0 TR\u00caN T\u1eacP X\u00c1C \u0110\u1ecaNH.<\/strong><\/p>\n<p><strong>Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i<\/strong><\/p>\n<p>T\u00ecm t\u1eadp x\u00e1c \u0111\u1ecbnh D c\u1ee7a h\u00e0m s\u1ed1 f.<\/p>\n<p>T\u00ednh f\u2019(x).<\/p>\n<p>T\u00ecm nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh f\u2019(x) = 0 (n\u1ebfu c\u00f3) v\u00e0 t\u00ecm c\u00e1c \u0111i\u1ec3m x<sub>0<\/sub> <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"17\" class=\"wp-image-23356\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-33.png\" alt=\"IMG_320\" \/> D m\u00e0 t\u1ea1i \u0111\u00f3 h\u00e0m f li\u00ean t\u1ee5c nh\u01b0ng f\u2019(x<sub>0<\/sub>) kh\u00f4ng t\u1ed3n t\u1ea1i.<\/p>\n<p>V\u1eadn d\u1ee5ng \u0111\u1ecbnh l\u00fd 2 (l\u1eadp b\u1ea3ng x\u00e9t d\u1ea5u f\u2019(x) ) hay \u0111\u1ecbnh l\u00fd 3 (t\u00ednh f\u2019\u2019(x)) \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m c\u1ef1c tr\u1ecb c\u1ee7a h\u00e0m s\u1ed1.<\/p>\n<p><strong><em>Ch\u00fa \u00fd:<\/em><\/strong> Cho h\u00e0m s\u1ed1 <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"25\" class=\"wp-image-23357\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-32.png\" alt=\"IMG_321\" \/> x\u00e1c \u0111\u1ecbnh tr\u00ean D.<\/p>\n<p>\u0110i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"29\" class=\"wp-image-23358\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-32.png\" alt=\"IMG_322\" \/> l\u00e0 \u0111i\u1ec3m c\u1ef1c tr\u1ecb c\u1ee7a h\u00e0m s\u1ed1 khi v\u00e0 ch\u1ec9 khi hai \u0111i\u1ec1u ki\u1ec7n sau \u0111\u00e2y c\u00f9ng th\u1ea3o m\u00e3n:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"15\" class=\"wp-image-23359\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-30.png\" alt=\"IMG_323\" \/> T\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"50\" height=\"29\" class=\"wp-image-23360\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-30.png\" alt=\"IMG_324\" \/> \u0111\u1ea1o h\u00e0m tri\u1ec7t ti\u00eau ho\u1eb7c kh\u00f4ng t\u1ed3n t\u1ea1i<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"15\" class=\"wp-image-23361\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-30.png\" alt=\"IMG_325\" \/> \u0110\u1ea1o h\u00e0m \u0111\u1ed5i d\u1ea5u khi <img loading=\"lazy\" decoding=\"async\" width=\"15\" height=\"15\" class=\"wp-image-23362\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-30.png\" alt=\"IMG_326\" \/> \u0111i qua <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"29\" class=\"wp-image-23363\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-30.png\" alt=\"IMG_327\" \/> .<\/p>\n<p><strong>C\u00e1c v\u00ed d\u1ee5<\/strong><\/p>\n<p><strong>V\u00ed d\u1ee5 1 : <\/strong>T\u00ecm c\u1ef1c tr\u1ecb c\u1ee7a c\u00e1c h\u00e0m s\u1ed1 sau:<\/p>\n<p><strong>1. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"54\" class=\"wp-image-23364\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-29.png\" alt=\"IMG_328\" \/> <strong>2. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"115\" height=\"54\" class=\"wp-image-23365\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-29.png\" alt=\"IMG_329\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i.<\/strong><\/p>\n<p><strong>1. <\/strong>T\u1eadp x\u00e1c \u0111\u1ecbnh : <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"32\" class=\"wp-image-23366\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-29.png\" alt=\"IMG_330\" \/><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"124\" height=\"52\" class=\"wp-image-23367\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-29.png\" alt=\"IMG_331\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"59\" height=\"20\" class=\"wp-image-23368\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-29.png\" alt=\"IMG_332\" \/> , suy ra h\u00e0m s\u1ed1 ngh\u1ecbch bi\u1ebfn tr\u00ean m\u1ed7i kho\u1ea3ng x\u00e1c \u0111\u1ecbnh v\u00e0 kh\u00f4ng c\u00f3 \u0111i\u1ec3m c\u1ef1c tr\u1ecb.<\/p>\n<p>Gi\u1edbi h\u1ea1n : <img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"42\" class=\"wp-image-23369\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-29.png\" alt=\"IMG_333\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"219\" height=\"37\" class=\"wp-image-23370\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-28.png\" alt=\"IMG_334\" \/><\/p>\n<p>B\u1ea3ng bi\u1ebfn thi\u00ean<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"411\" height=\"258\" class=\"wp-image-23371\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-28.png\" alt=\"IMG_335\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_335-28.png 411w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_335-28-300x188.png 300w\" sizes=\"(max-width: 411px) 100vw, 411px\" \/><\/p>\n<p><strong>2. <\/strong>T\u1eadp x\u00e1c \u0111\u1ecbnh : <img loading=\"lazy\" decoding=\"async\" width=\"90\" height=\"32\" class=\"wp-image-23372\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-28.png\" alt=\"IMG_336\" \/><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"140\" height=\"60\" class=\"wp-image-23373\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-28.png\" alt=\"IMG_337\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"22\" class=\"wp-image-23374\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-28.png\" alt=\"IMG_338\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"185\" height=\"97\" class=\"wp-image-23375\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-27.png\" alt=\"IMG_339\" \/><\/p>\n<p>Gi\u1edbi h\u1ea1n : <img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"42\" class=\"wp-image-23376\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-27.png\" alt=\"IMG_340\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"219\" height=\"37\" class=\"wp-image-23377\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-27.png\" alt=\"IMG_341\" \/><\/p>\n<p>B\u1ea3ng bi\u1ebfn thi\u00ean<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"467\" height=\"256\" class=\"wp-image-23378\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-27.png\" alt=\"IMG_342\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_342-27.png 467w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_342-27-300x164.png 300w\" sizes=\"(max-width: 467px) 100vw, 467px\" \/><\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"129\" height=\"49\" class=\"wp-image-23379\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-26.png\" alt=\"IMG_343\" \/> ,h\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"125\" height=\"49\" class=\"wp-image-23380\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-26.png\" alt=\"IMG_344\" \/> .<\/p>\n<p><strong>V\u00ed d\u1ee5 2 : <\/strong>T\u00ecm c\u1ef1c tr\u1ecb c\u1ee7a c\u00e1c h\u00e0m s\u1ed1 sau:<\/p>\n<p><strong>1. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"170\" height=\"54\" class=\"wp-image-23381\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-26.png\" alt=\"IMG_345\" \/> <strong>2. <\/strong> <img loading=\"lazy\" decoding=\"async\" width=\"155\" height=\"39\" class=\"wp-image-23382\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-25.png\" alt=\"IMG_346\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_346-25.png 155w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_346-25-150x39.png 150w\" sizes=\"(max-width: 155px) 100vw, 155px\" \/><\/p>\n<p><strong>L\u1eddi gi\u1ea3i.<\/strong><\/p>\n<p><strong>1. <\/strong>T\u1eadp x\u00e1c \u0111\u1ecbnh : <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"20\" class=\"wp-image-23383\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-24.png\" alt=\"IMG_347\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_347-24.png 54w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_347-24-50x20.png 50w\" sizes=\"(max-width: 54px) 100vw, 54px\" \/><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"129\" height=\"32\" class=\"wp-image-23384\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-23.png\" alt=\"IMG_348\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"102\" height=\"25\" class=\"wp-image-23385\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-23.png\" alt=\"IMG_349\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"155\" height=\"79\" class=\"wp-image-23386\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-23.png\" alt=\"IMG_350\" \/> .<\/p>\n<p>Gi\u1edbi h\u1ea1n : <img loading=\"lazy\" decoding=\"async\" width=\"320\" height=\"55\" class=\"wp-image-23387\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-23.png\" alt=\"IMG_351\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_351-23.png 320w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_351-23-300x52.png 300w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/> ;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"320\" height=\"55\" class=\"wp-image-23388\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-23.png\" alt=\"IMG_352\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_352-23.png 320w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_352-23-300x52.png 300w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/p>\n<p>B\u1ea3ng bi\u1ebfn thi\u00ean<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"465\" height=\"208\" class=\"wp-image-23389\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-23.png\" alt=\"IMG_353\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_353-23.png 465w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_353-23-300x134.png 300w\" sizes=\"(max-width: 465px) 100vw, 465px\" \/><\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"20\" class=\"wp-image-23390\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-23.png\" alt=\"IMG_354\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"79\" height=\"49\" class=\"wp-image-23391\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-23.png\" alt=\"IMG_355\" \/> ,h\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-23392\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_356-23.png\" alt=\"IMG_356\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"29\" class=\"wp-image-23393\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-23.png\" alt=\"IMG_357\" \/> .<\/p>\n<p><strong>2. <\/strong>T\u1eadp x\u00e1c \u0111\u1ecbnh : <img loading=\"lazy\" decoding=\"async\" width=\"54\" height=\"20\" class=\"wp-image-23394\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-23.png\" alt=\"IMG_358\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_358-23.png 54w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_358-23-50x20.png 50w\" sizes=\"(max-width: 54px) 100vw, 54px\" \/><\/p>\n<p>Ta c\u00f3: <img loading=\"lazy\" decoding=\"async\" width=\"132\" height=\"39\" class=\"wp-image-23395\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_359-23.png\" alt=\"IMG_359\" \/> , <img loading=\"lazy\" decoding=\"async\" width=\"62\" height=\"22\" class=\"wp-image-23396\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_360-22.png\" alt=\"IMG_360\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"419\" height=\"59\" class=\"wp-image-23397\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_361-21.png\" alt=\"IMG_361\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_361-21.png 419w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_361-21-300x42.png 300w\" sizes=\"(max-width: 419px) 100vw, 419px\" \/><\/p>\n<p>Gi\u1edbi h\u1ea1n : <img loading=\"lazy\" decoding=\"async\" width=\"209\" height=\"37\" class=\"wp-image-23398\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_362-21.png\" alt=\"IMG_362\" \/><\/p>\n<p>B\u1ea3ng bi\u1ebfn thi\u00ean<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"435\" height=\"215\" class=\"wp-image-23399\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_363-18.png\" alt=\"IMG_363\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_363-18.png 435w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_363-18-300x148.png 300w\" sizes=\"(max-width: 435px) 100vw, 435px\" \/><\/p>\n<p>H\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c ti\u1ec3u t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"22\" class=\"wp-image-23400\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_364-20.png\" alt=\"IMG_364\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"29\" class=\"wp-image-23401\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_365-20.png\" alt=\"IMG_365\" \/> ,h\u00e0m s\u1ed1 \u0111\u1ea1t c\u1ef1c \u0111\u1ea1i t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"40\" height=\"20\" class=\"wp-image-23402\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_366-20.png\" alt=\"IMG_366\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"70\" height=\"29\" class=\"wp-image-23403\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_367-20.png\" alt=\"IMG_367\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A. CHU\u1ea8N KI\u1ebeN TH\u1ee8C 1. Kh\u00e1i ni\u1ec7m c\u1ef1c tr\u1ecb h\u00e0m s\u1ed1 : Gi\u1ea3 s\u1eed h\u00e0m s\u1ed1 x\u00e1c \u0111\u1ecbnh tr\u00ean t\u1eadp h\u1ee3p v\u00e0 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t \u0111i\u1ec3m c\u1ef1c \u0111\u1ea1i c\u1ee7a h\u00e0m s\u1ed1 n\u1ebfu t\u1ed3n t\u1ea1i m\u1ed9t kho\u1ea3ng ch\u1ee9a \u0111i\u1ec3m sao cho: . Khi \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i c\u1ee7a h\u00e0m s\u1ed1 . [&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-23291","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\/23291","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=23291"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/23291\/revisions"}],"predecessor-version":[{"id":23404,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/23291\/revisions\/23404"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=23291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=23291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=23291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}