{"id":993,"date":"2021-10-08T12:59:12","date_gmt":"2021-10-08T12:59:12","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=993"},"modified":"2022-02-16T18:42:32","modified_gmt":"2022-02-16T11:42:32","slug":"he-thuc-vi-et-va-ung-dung-phuong-phap-hoc-hieu-qua","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/he-thuc-vi-et-va-ung-dung-phuong-phap-hoc-hieu-qua\/","title":{"rendered":"H\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng \u2013 ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc hi\u1ec7u qu\u1ea3"},"content":{"rendered":"\n<script type=\"text\/javascript\">\nimg_numb = 10;\nauto_convert_bool = false;\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\">Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"L\u1edbp 9| To\u00e1n |H\u1ec7 th\u1ee9c Vi- \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng | L\u1edbp h\u1ecdc kh\u00f4ng kho\u1ea3ng c\u00e1ch | HOCMAI - VTC\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/0cWG7poUvWQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>H\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trong <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n<\/a> h\u1ecdc l\u1edbp 9, h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng l\u00e0 ki\u1ebfn th\u1ee9c quan tr\u1ecdng \u0111\u1ec3 \u00e1p d\u1ee5ng trong h\u1ea7u h\u1ebft c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp. \u0110\u1ec3 \u00f4n t\u1eadp c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t l\u1edbp 9 n\u00e0y v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3. H\u00e3y c\u00f9ng Vietlearn.org theo d\u00f5i b\u00e0i gi\u1ea3ng chi ti\u1ebft ngay sau \u0111\u00e2y.<\/p>\n\n\n\n<br><br>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-ly-thuy\u1ebft-v\u1ec1-h\u1ec7-th\u1ee9c-vi-et-va-\u1ee9ng-d\u1ee5ng\">I. L\u00fd thuy\u1ebft v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<\/h2>\n\n\n\n<br>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-h\u1ec7-th\u1ee9c-vi-et\">1. H\u1ec7 th\u1ee9c vi \u00e9t:<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">X\u00e9t ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai m\u1ed9t \u1ea9n ax\u00b2 + bx + c = 0 (Trong \u0111\u00f3 a \u22600), n\u1ebfu x\u2081 v\u00e0 x\u2082 l\u00e0 hai nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh, d\u00f9 nghi\u1ec7m \u0111\u00f3 l\u00e0 nghi\u1ec7m k\u00e9p hay hai nghi\u1ec7m ph\u00e2n bi\u1ec7t \u0111\u1ec1u c\u00f3 th\u1ec3 vi\u1ebft \u0111\u01b0\u1ee3c d\u01b0\u1edbi d\u1ea1ng sau:<\/p>\n\n\n<p>[latexpage] x\u2081 = ${(-b + \\sqrt{\\Delta}) \\over 2a}$ v\u00e0 x\u2082 =  ${(-b &#8211; \\sqrt{\\Delta}) \\over 2a}$<\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\">Khi \u0111\u00f3 n\u1ebfu x\u2081 v\u00e0 x\u2082 l\u00e0 2 nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai ax\u00b2 + bx + c = 0 (Trong \u0111\u00f3 a \u22600), ta c\u00f3 h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh sau:<\/p>\n\n\n<p>[latexpage] x\u2081 + x\u2082 = -b\/a  v\u00e0 x\u2081 . x\u2082 = c\/a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1edbi l\u00fd thuy\u1ebft tr\u00ean c\u00f3 th\u1ec3 th\u1ea5y h\u1ec7 th\u1ee9c vi \u00e9t l\u00e0 ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 c\u00f3 th\u1ec3 gi\u1ea3i \u0111\u01b0\u1ee3c t\u1ea5t c\u1ea3 c\u00e1c d\u1ea1ng to\u00e1n t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao trong <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n<\/a> h\u1ecdc l\u1edbp 9 v\u00e0 c\u00e1c l\u1edbp kh\u00e1c.<\/p>\n\n\n\n<br>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-h\u1ec7-th\u1ee9c-vi-et-va-\u1ee9ng-d\u1ee5ng\">2. H\u1ec7 th\u1ee9c Vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<\/h3>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"a-tinh-nh\u1ea9m-nghi\u1ec7m\">a. T\u00ednh nh\u1ea9m nghi\u1ec7m:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u1ee8ng d\u1ee5ng \u0111\u1ecbnh l\u00fd vi \u00e9t t\u00ednh nh\u1ea9m nghi\u1ec7m nh\u01b0 sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai m\u1ed9t \u1ea9n ax\u00b2 <strong>+ bx + c = 0<\/strong> (Trong \u0111\u00f3 a \u22600) v\u1edbi <strong>a + b + c = 0<\/strong> th\u00ec ta c\u00f3 m\u1ed9t nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh n\u00e0y l\u00e0 <strong>x\u2081 = 1<\/strong> v\u00e0 m\u1ed9t nghi\u1ec7m c\u00f2n l\u1ea1i l\u00e0 <strong>x\u2082 = c\/a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai m\u1ed9t \u1ea9n <strong>ax\u00b2 + bx + c = 0 <\/strong>(Trong \u0111\u00f3 a \u22600) v\u1edbi <strong>a \u2013 b + c = 0 <\/strong>th\u00ec ta c\u00f3 m\u1ed9t nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh n\u00e0y l\u00e0 <strong>x\u2081 = -1 <\/strong>v\u00e0 m\u1ed9t nghi\u1ec7m c\u00f2n l\u1ea1i l\u00e0 <strong>x\u2082 = -c\/a<\/strong><\/p>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"b-tim-2-s\u1ed1-khi-bi\u1ebft-tich-va-t\u1ed5ng\">b. T\u00ecm 2 s\u1ed1 khi bi\u1ebft t\u00edch v\u00e0 t\u1ed5ng:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u1ee8ng d\u1ee5ng \u0111\u1ecbnh l\u00fd vi \u00e9t cho b\u00e0i to\u00e1n t\u00ecm 2 s\u1ed1 khi bi\u1ebft t\u00edch v\u00e0 t\u1ed5ng nh\u01b0 sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu 2 s\u1ed1 c\u00f3 t\u1ed5ng l\u00e0 S v\u00e0 t\u00edch l\u00e0 P th\u00ec 2 s\u1ed1 \u0111\u00f3 s\u1ebd l\u00e0 2 nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t \u1ea9n sau: <strong>x\u00b2 \u2013 Sx + P = 0<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 hai s\u1ed1 n\u00e0y t\u1ed3n t\u1ea1i l\u00e0<strong> S\u00b2 \u2013 4P \u2265 0<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i gi\u1ea3ng tr\u00ean \u0111\u00e2y l\u00e0 to\u00e0n b\u1ed9 nh\u1eefng <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<\/a> v\u1ec1 c\u00f4ng th\u1ee9c vi \u00e9t, h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u00e1p d\u1ee5ng b\u00e0i t\u1eadp chi ti\u1ebft nh\u1ea5t. \u0110\u1ec3 c\u1ee7ng c\u1ed1 l\u1ea1i to\u00e0n b\u1ed9 ki\u1ebfn th\u1ee9c v\u1ec1 n\u1ed9i dung quan tr\u1ecdng n\u00e0y, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 s\u01a1 \u0111\u1ed3 t\u01b0 duy v\u1ec1 h\u1ec7 th\u1ee9c.<\/p>\n\n\n\n<br>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ii-cac-d\u1ea1ng-bai-t\u1eadp-v\u1ec1-h\u1ec7-th\u1ee9c-vi-et-va-\u1ee9ng-d\u1ee5ng\">II. C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng:<\/h2>\n\n\n\n<br>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"d\u1ea1ng-1-nh\u1ea9m-nghi\u1ec7m-c\u1ee7a-ph\u01b0\u01a1ng-trinh-b\u1eadc-hai\"><strong>D\u1ea1ng 1: Nh\u1ea9m nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai<\/strong><\/h3>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"d\u1ea1ng-d\u1eb7c-bi\u1ec7t-ph\u01b0\u01a1ng-trinh-b\u1eadc-hai-co-m\u1ed9t-nghi\u1ec7m-la-1-ho\u1eb7c-1\"><strong>D\u1ea1ng \u0111\u1eb7c bi\u1ec7t:<\/strong>&nbsp;Ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 m\u1ed9t nghi\u1ec7m l\u00e0 1 ho\u1eb7c -1 <\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00ed d\u1ee5 1:<\/strong> Nh\u1ea9m nghi\u1ec7m c\u1ee7a c\u00e1c ph\u01b0\u01a1ng tr\u00ecnh sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a. 3x<sup>2<\/sup> + 8x &#8211; 11 = 0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b. 2x<sup>2<\/sup> + 5x + 3 = 0<\/p>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"cho-ph\u01b0\u01a1ng-trinh-b\u1eadc-hai-co-m\u1ed9t-h\u1ec7-s\u1ed1-cho-bi\u1ebft-cho-tru\u1edbc-m\u1ed9t-nghi\u1ec7m-tim-nghi\u1ec7m-con-l\u1ea1i-va-ch\u1ec9-ra-h\u1ec7-s\u1ed1-ch\u01b0a-bi\u1ebft-c\u1ee7a-ph\u01b0\u01a1ng-trinh\"><strong>Cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai, c\u00f3 m\u1ed9t h\u1ec7 s\u1ed1 cho bi\u1ebft, cho tru\u1edbc m\u1ed9t nghi\u1ec7m, t\u00ecm nghi\u1ec7m c\u00f2n l\u1ea1i v\u00e0 ch\u1ec9 ra h\u1ec7 s\u1ed1 ch\u01b0a bi\u1ebft c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh:<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00ed d\u1ee5 2:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a) Ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_256.png\" alt=\"IMG_256\"> c\u00f3 m\u1ed9t nghi\u1ec7m b\u1eb1ng 2, t\u00ecm p v\u00e0 nghi\u1ec7m c\u00f2n l\u1ea1i c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b) Ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_257.png\" alt=\"IMG_257\"> c\u00f3 m\u1ed9t nghi\u1ec7m b\u1eb1ng 5, t\u00ecm q v\u00e0 nghi\u1ec7m c\u00f2n l\u1ea1i c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">c) Ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_258.png\" alt=\"IMG_258\"> bi\u1ebft hi\u1ec7u hai nghi\u1ec7m b\u1eb1ng 11 . T\u00ecm q v\u00e0 hai nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">d) Ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_259.png\" alt=\"IMG_259\"> c\u00f3 hai nghi\u1ec7m trong \u0111\u00f3 m\u1ed9t nghi\u1ec7m g\u1ea5p \u0111\u00f4i nghi\u1ec7m kia, t\u00ecm q v\u00e0 hai nghi\u1ec7m \u0111\u00f3<\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 1:<\/strong> T\u00ecm nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a) 5 <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_260.png\" alt=\"IMG_260\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b) <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_261.png\" alt=\"IMG_261\"><\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 2:<\/strong> X\u00e1c \u0111\u1ecbnh m v\u00e0 t\u00ecm nghi\u1ec7m c\u00f2n l\u1ea1i c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a) <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_262.png\" alt=\"IMG_262\"> bi\u1ebft m\u1ed9t nghi\u1ec7m b\u1eb1ng -3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b) <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_263.png\" alt=\"IMG_263\"> bi\u1ebft m\u1ed9t nghi\u1ec7m b\u1eb1ng 3<\/p>\n\n\n\n<br>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"d\u1ea1ng-2-l\u1eadp-ph\u01b0\u01a1ng-trinh-b\u1eadc-hai\"><strong>D\u1ea1ng 2: L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai<\/strong><\/h3>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"l\u1eadp-ph\u01b0\u01a1ng-trinh-b\u1eadc-hai-bi\u1ebft-hai-nghi\u1ec7m\"><strong>L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai bi\u1ebft hai nghi\u1ec7m<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00ed d\u1ee5 :<\/strong> L\u1eadp m\u1ed9t ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai ch\u1ee9a hai nghi\u1ec7m l\u00e0 3 v\u00e0 2<\/p>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"l\u1eadp-ph\u01b0\u01a1ng-trinh-b\u1eadc-hai-co-hai-nghi\u1ec7m-tho\u1ea3-man-bi\u1ec3u-th\u1ee9c-ch\u1ee9a-hai-nghi\u1ec7m-c\u1ee7a-m\u1ed9t-ph\u01b0\u01a1ng-trinh-cho-tr\u01b0\u1edbc\"><strong>L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 hai nghi\u1ec7m tho\u1ea3 m\u00e3n bi\u1ec3u th\u1ee9c ch\u1ee9a hai nghi\u1ec7m c\u1ee7a m\u1ed9t ph\u01b0\u01a1ng tr\u00ecnh cho tr\u01b0\u1edbc.<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00ed d\u1ee5 : <\/strong>Cho ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_264.png\" alt=\"IMG_264\"> c\u00f3 hai nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_265.png\" alt=\"IMG_265\"><\/p>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"bai-t\u1eadp-ap-d\u1ee5ng\"><strong>B\u00e0i t\u1eadp \u00e1p d\u1ee5ng:<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 1:<\/strong> L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 c\u00e1c nghi\u1ec7m l\u00e0:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a) 8 v\u00e0 -3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b) 36 v\u00e0 -104<\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 2:<\/strong> Cho ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_266.png\" alt=\"IMG_266\"> c\u00f3 hai nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_267.png\" alt=\"IMG_267\"> . H\u00e3y l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 c\u00e1c nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_268.png\" alt=\"IMG_268\"><\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 3:<\/strong> Cho ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_269.png\" alt=\"IMG_269\"> c\u00f3 hai nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_270.png\" alt=\"IMG_270\"> . H\u00e3y l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 c\u00e1c nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_271.png\" alt=\"IMG_271\"><\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 4:<\/strong> L\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 c\u00e1c nghi\u1ec7m b\u1eb1ng ngh\u1ecbch \u0111\u1ea3o c\u00e1c nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_272.png\" alt=\"IMG_272\"><\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 5<\/strong>: Cho ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_273.png\" alt=\"IMG_273\"> c\u00f3 hai nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_274.png\" alt=\"IMG_274\"> . H\u00e3y l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai c\u00f3 c\u00e1c nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_275.png\" alt=\"IMG_275\"><\/p>\n\n\n\n<br>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"d\u1ea1ng-3-tim-hai-s\u1ed1-bi\u1ebft-t\u1ed5ng-va-tich-c\u1ee7a-chung\"><strong>D\u1ea1ng 3: T\u00ecm hai s\u1ed1 bi\u1ebft t\u1ed5ng v\u00e0 t\u00edch c\u1ee7a ch\u00fang.<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00ed d\u1ee5 1<\/strong>: T\u00ecm hai s\u1ed1 a v\u00e0 b bi\u1ebft S=a+b=-3, P=a b=-4<\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00ed d\u1ee5 2<\/strong>: T\u00ecm hai s\u1ed1 a v\u00e0 b bi\u1ebft S=a+b=3, P=a b=6<\/p>\n\n\n\n<br>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"bai-t\u1eadp-ap-d\u1ee5ng\"><strong>B\u00e0i t\u1eadp \u00e1p d\u1ee5ng:<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 1:<\/strong> T\u00ecm hai s\u1ed1 bi\u1ebft t\u1ed5ng S =9 v\u00e0 t\u00edch P=20<\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u00e0i 2:<\/strong> T\u00ecm x, y bi\u1ebft<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a) x + y = 11 ; x y = 28<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b) x \u2013 y = 5 ; x y = 66<\/p>\n\n\n\n<br>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"d\u1ea1ng-4-d\u1ea1ng-toan-v\u1ec1-bi\u1ec3u-th\u1ee9c-lien-h\u1ec7-gi\u1eefa-cac-nghi\u1ec7m-c\u1ee7a-ph\u01b0\u01a1ng-trinh-b\u1eadc-hai\"><strong>D\u1ea1ng 4: D\u1ea1ng to\u00e1n v\u1ec1 bi\u1ec3u th\u1ee9c li\u00ean h\u1ec7 gi\u1eefa c\u00e1c nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai.<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"tinh-gia-tr\u1ecb-c\u1ee7a-bi\u1ec3u-th\u1ee9c-ch\u1ee9a-nghi\u1ec7m\"><strong>T\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c ch\u1ee9a nghi\u1ec7m.<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>V\u00ed d\u1ee5:<\/strong> Cho ph\u01b0\u01a1ng tr\u00ecnh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_276.png\" alt=\"IMG_276\"> c\u00f3 hai nghi\u1ec7m <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_277.png\" alt=\"IMG_277\"> h\u00e3y t\u00ednh <img decoding=\"async\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/10\/img_278.png\" alt=\"IMG_278\"><\/p>\n\n\n\n<br>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i gi\u1ea3ng tr\u00ean \u0111\u00e3 cung c\u1ea5p cho c\u00e1c b\u1ea1n v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00f4ng th\u1ee9c vi \u00e9t c\u0169ng nh\u01b0 c\u00e1c d\u1ea1ng to\u00e1n th\u01b0\u1eddng g\u1eb7p. Hy v\u1ecdng \u0111\u00e2y s\u1ebd l\u00e0 nh\u1eefng ki\u1ebfn th\u1ee9c b\u1ed5 \u00edch d\u00e0nh cho c\u00e1c b\u1ea1n <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a>, \u0111\u1eb7c bi\u1ec7t l\u00e0 qu\u00fd ph\u1ee5 huynh c\u00f3 nhu c\u1ea7u \u00f4n t\u1eadp v\u00e0 gi\u1ea3ng d\u1ea1y cho c\u00e1c em. Trong qu\u00e1 tr\u00ecnh <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> v\u00e0 \u00f4n luy\u1ec7n, n\u1ebfu c\u00f3 nhu c\u1ea7u t\u00ecm ki\u1ebfm \u0111\u01a1n v\u1ecb <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> uy t\u00edn, ch\u1ea5t l\u01b0\u1ee3ng ho\u1eb7c mu\u1ed1n \u0111\u01b0\u1ee3c gi\u1ea3i \u0111\u00e1p v\u1ec1 nh\u1eefng ki\u1ebfn th\u1ee9c li\u00ean quan \u0111\u1ebfn m\u00f4n h\u1ecdc, h\u00e3y li\u00ean h\u1ec7 v\u1edbi Vietlearn.org \u0111\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i \u0111\u00e1p nhanh nh\u1ea5t c\u00f3 th\u1ec3.<\/p>\n\n\n\n<br>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"iii-xem-them-video-hay-v\u1ec1-h\u1ec7-th\u1ee9c-vi-et-va-\u1ee9ng-d\u1ee5ng\">III. Xem th\u00eam video hay v\u1ec1 h\u1ec7 th\u1ee9c Vi \u00e9t v\u00e0 \u1ee8ng d\u1ee5ng<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"To\u00e1n 9. H\u00ea\u0323 th\u01b0\u0301c Vi- e\u0301t. Bi\u00ea\u0309u th\u01b0\u0301c kh\u00f4ng \u0111\u00f4\u0301i x\u01b0\u0301ng(Hay va\u0300 \u0111\u0103\u0323c bi\u00ea\u0323t).\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/IDFYHG1aX2s?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>To\u00e1n 9. H\u1ec7 th\u1ee9c Vi- \u00e9t. Bi\u1ec3u th\u1ee9c kh\u00f4ng \u0111\u1ed1i x\u1ee9ng(Hay v\u00e0 \u0111\u1eb7c bi\u1ec7t).<\/figcaption><\/figure>\n\n\n\n<div style=\"display:none\">\nvi et<br>\nvi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi et<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi et<br>\nc\u00f4ng th\u1ee9c vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi \u00e9t thi v\u00e0o l\u1edbp 10<br>\n\u0111\u1ecbnh l\u00fd vi \u00e9t<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-\u00e9t thi v\u00e0o l\u1edbp 10<br>\nh\u1ec7 th\u1ee9c vi \u00e9t m\u1edf r\u1ed9ng<br>\nvi-et<br>\nvi \u00e9t b\u1eadc 3<br>\n\u0111\u1ecbnh l\u00fd vi et l\u1edbp 9<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t m\u1edf r\u1ed9ng<br>\n\u0111\u1ecbnh l\u00fd vi-et l\u1edbp 9<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t \u0111\u1ea3o<br>\n\u0111\u1ecbnh l\u00fd vi et<br>\nvi-\u00e9t<br>\nvi \u00e9t b\u1eadc 2<br>\nvi \u00e9t \u0111\u1ea3o<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t l\u00e0 g\u00ec<br>\nc\u00f4ng th\u1ee9c vi \u00e9t l\u1edbp 9<br>\nc\u00f4ng th\u1ee9c t\u00ednh vi \u00e9t<br>\ndinh ly vi et trong toan hoc<br>\nvi et l\u1edbp 9<br>\ndinh ly vi et<br>\n\u0111\u1ecbnh l\u00fd vi-et<br>\n\u0111\u1ecbnh lu\u1eadt vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nb\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi \u00e9t c\u00f3 \u0111\u00e1p \u00e1n<br>\nvi-\u00e9t b\u1eadc 3<br>\nhe thuc vi et<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t<br>\nvi et ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nvi et nam net<br>\n\u0111\u1ecbnh l\u00ed vi-\u00e9t cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2<br>\nb\u00e0i 6 h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\n\u0111\u1ecbnh l\u00ed vi-\u00e9t cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\n\u0111\u1ecbnh l\u00ed vi-\u00e9t<br>\n\u0111\u1ecbnh l\u00fd vi \u00e9t to\u00e1n 9<br>\nd\u0111\u1ecbnh l\u00fd vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi-et<br>\ndinh li vi et<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t b\u1eadc 3<br>\nc\u00f4ng th\u1ee9c vi et<br>\n\u0111\u1ecbnh l\u00fd vi \u00e9t to\u00e1n<br>\nto\u00e1n 9 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\n\u1ee9ng d\u1ee5ng \u0111\u1ecbnh l\u00fd vi et trong gi\u1ea3i to\u00e1n<br>\nb\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi-\u00e9t c\u00f3 \u0111\u00e1p \u00e1n<br>\nvi-et l\u1edbp 9<br>\nd\u0111\u1ecbnh l\u00ed vi \u00e9t<br>\nc\u00e1c c\u00f4ng th\u1ee9c vi \u00e9t<br>\nc\u00f4ng th\u1ee9c vi-\u00e9t<br>\nb\u00e0i t\u1eadp n\u00e2ng cao v\u1ec1 h\u1ec7 th\u1ee9c vi-\u00e9t<br>\nvi \u00e9t x1-x2<br>\nct vi \u00e9t<br>\nc\u00e1ch t\u00ednh vi \u00e9t<br>\nvi \u00e9t l\u1edbp 9<br>\nvi \u00e9t l\u00e0 g\u00ec<br>\n\u0111\u1ecbnh l\u00fd vi-\u00e9t<br>\nc\u00f4ng th\u1ee9c vi-\u00e9t l\u1edbp 9<br>\n\u1ee9ng d\u1ee5ng \u0111\u1ecbnh l\u00fd vi-et trong gi\u1ea3i to\u00e1n<br>\ndinh ly vi-et lop 9<br>\ngi\u1ea3i vi \u00e9t<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-\u00e9t thi l\u1edbp 10<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-\u00e9t thi v\u00e0o l\u1edbp 10 violet<br>\nvi \u00e9t h\u00e0m b\u1eadc 3<br>\nh\u1ec7 th\u1ee9c vi-et<br>\nvi \u00e9t b\u1eadc 4<br>\nc\u00e1c d\u1ea1ng b\u00e0i vi \u00e9t thi v\u00e0o l\u1edbp 10<br>\nvi \u00e9t c\u00f4ng th\u1ee9c<br>\nh\u1eb1ng \u0111\u1eb3ng th\u1ee9c vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nc\u00f4ng th\u1ee9c \u0111\u1ecbnh l\u00ed vi \u00e9t<br>\nx1^2+x2^2 vi et<br>\n\u1ee9ng d\u1ee5ng vi \u00e9t<br>\nto\u00e1n vi \u00e9t<br>\ntheo vi \u00e9t<br>\ngi\u1ea3i to\u00e1n 9 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nd\u0111\u1ecbnh l\u00ed vi et<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t l\u1edbp 10<br>\nd\u0111\u1ecbnh l\u00fd vi et<br>\nt\u00ednh vi \u00e9t<br>\nvi et b\u1eadc 3<br>\nph\u01b0\u01a1ng tr\u00ecnh vi \u00e9t<br>\n\u0111l vi \u00e9t<br>\nvi et armis<br>\ncong thuc vi et<br>\nc\u00e1ch gi\u1ea3i vi-\u00e9t<br>\nc\u00e1ch gi\u1ea3i h\u1ec7 th\u1ee9c vi et<br>\nc\u00e1c d\u1ea1ng vi \u00e9t th\u01b0\u1eddng g\u1eb7p<br>\nto\u00e1n 9 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng sbt<br>\nh\u1ec7 th\u1ee9c vi \u00e9t x1 &#8211; x2<br>\nvi \u00e9t to\u00e1n 9<br>\nc\u00e1c c\u00f4ng th\u1ee9c vi \u00e9t l\u1edbp 9<br>\nc\u00e1c d\u1ea1ng bi\u1ebfn \u0111\u1ed5i vi \u00e9t<br>\ndinh luat vi et<br>\nc\u00e1c c\u00f4ng th\u1ee9c bi\u1ebfn \u0111\u1ed5i vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng luy\u1ec7n t\u1eadp<br>\nvi \u00e9t 9<br>\ntheo vi et<br>\nc\u00e1c c\u00f4ng th\u1ee9c t\u00ednh vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t trong v\u1eadt l\u00fd<br>\nh\u1ec7 th\u1ee9c vi \u00e9t b\u1eadc 3<br>\nsex vi et nam<br>\nh\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng sbt<br>\nc\u00f4ng th\u1ee9c vi-et<br>\n\u0111\u1ecbnh l\u00ed vi-et \u0111\u1ea3o<br>\nnh\u00e0 to\u00e1n h\u1ecdc vi \u00e9t<br>\nc\u00e1c h\u1ec7 th\u1ee9c vi \u00e9t th\u01b0\u1eddng g\u1eb7p<br>\nc\u00e1ch gi\u1ea3i vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\ngi\u1ea3i b\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nc\u00e1c d\u1ea1ng vi \u00e9t<br>\nto\u00e1n vi \u00e9t l\u1edbp 9<br>\nvi- \u00e9t<br>\nto\u00e1n 9 b\u00e0i 6 h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nh\u1ec7 qu\u1ea3 vi \u00e9t<br>\nb\u00e0i t\u1eadp vi \u00e9t<br>\nvi-et \u0111\u1ea3o<br>\nc\u00e1c d\u1ea1ng b\u00e0i vi \u00e9t<br>\nh\u1ec7 qu\u1ea3 \u0111\u1ecbnh l\u00ed vi-\u00e9t<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng sbt<br>\nbi\u1ebfn \u0111\u1ed5i vi \u00e9t<br>\nto\u00e1n 9 b\u00e0i h\u1ec7 th\u1ee9c vi-\u00e9t<br>\n\u0111inh l\u00ed vi \u00e9t<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-\u00e9t thi v\u00e0o l\u1edbp 10 n\u00e2ng cao<br>\nc\u00f4ng th\u1ee9c vi \u00e9t m\u1edf r\u1ed9ng<br>\nvi-\u00e9t b\u1eadc 2<br>\nc\u00e1c b\u00e0i to\u00e1n v\u1ec1 vi \u00e9t<br>\nc\u00e1c b\u00e0i to\u00e1n vi \u00e9t thi v\u00e0o l\u1edbp 10<br>\ndl vi et<br>\nct vi et<br>\nh\u1ec7 th\u1ee9c vi \u00e9t \u0111\u1ea3o<br>\ngi\u1ea3i sbt to\u00e1n 9 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00e1c d\u1ea1ng h\u1ec7 th\u1ee9c vi \u00e9t<br>\nh\u1ec7 th\u01b0\u1ee9c vi \u00e9t<br>\n\u0111\u1ecbnh l\u00fd vi-et \u00e1p d\u1ee5ng trong l\u0129nh v\u1ef1c n\u00e0o<br>\n\u1ee9ng d\u1ee5ng \u0111\u1ecbnh l\u00ed vi-\u00e9t<br>\nchuy\u00ean \u0111\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nto\u00e1n 9 \u0111\u1ecbnh l\u00ed vi \u00e9t<br>\nvi et cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nchuy\u00ean \u0111\u1ec1 h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nc\u00f4ng th\u1ee9c vi \u00e9t b\u1eadc 3<br>\nc\u00e1c b\u00e0i t\u1eadp v\u1ec1 vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng n\u00e2ng cao<br>\nvi \u00e9t kh\u00f4ng \u0111\u1ed1i x\u1ee9ng<br>\nvi et \u0111\u1ea3o<br>\nc\u00f4ng th\u1ee9c t\u00ednh h\u1ec7 th\u1ee9c vi \u00e9t<br>\ngi\u1ea3i sbt to\u00e1n 9 b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t<br>\nb\u00e0i t\u1eadp v\u1ec1 \u0111\u1ecbnh l\u00ed vi \u00e9t<br>\nd\u1ecbnh l\u00ed vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t b\u1eadc 2<br>\ndl vi-et<br>\nc\u00e1c d\u1ea1ng b\u00e0i vi \u00e9t l\u1edbp 9<br>\nvi-et ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nso\u1ea1n b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi \u00e9t<br>\nto\u00e1n vi-\u00e9t l\u1edbp 9<br>\nh\u1ec7 th\u1ee9c vi-et v\u00e0 \u1ee9ng d\u1ee5ng<br>\nvi et to\u00e1n<br>\nph\u00e1t bi\u1ec3u \u0111\u1ecbnh l\u00ed vi \u00e9t<br>\nvi et c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nc\u00e1c d\u1ea1ng b\u00e0i to\u00e1n vi \u00e9t<br>\nhe thuc vi et va ung dung toan 9<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t to\u00e1n 9<br>\nc\u00e1c b\u00e0i to\u00e1n v\u1ec1 h\u1ec7 th\u1ee9c vi-\u00e9t<br>\nc\u00e1c c\u00f4ng th\u1ee9c vi et<br>\nbai tap he thuc vi et lop 9<br>\nc\u00f4ng th\u1ee9c t\u00ednh vi \u00e9t l\u1edbp 9<br>\nb\u00e0i t\u1eadp v\u1ec1 vi \u00e9t<br>\nc\u00e1ch t\u00ednh h\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi \u00e9t m\u1edf r\u1ed9ng<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-et l\u1edbp 9<br>\nvi-\u00e9t 9<br>\nc\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nx1^4 &#8211; x2^4 vi et<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 4<br>\nm\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi-et<br>\nc\u00f4ng th\u1ee9c h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00f4ng th\u1ee9c \u0111\u1ecbnh l\u00ed vi-et<br>\nb\u00e0i t\u1eadp vi \u00e9t l\u1edbp 9<br>\nvi \u00e9t tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\nb\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi-\u00e9t c\u00f3 \u0111\u00e1p an<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t b\u1eadc 3<br>\nb\u00e0i t\u1eadp vi-\u00e9t kh\u00f4ng \u0111\u1ed1i x\u1ee9ng c\u00f3 \u0111\u00e1p \u00e1n<br>\nvi &#8211; et<br>\nc\u00f4ng th\u1ee9c t\u00ednh vi et<br>\nc\u00e1ch l\u00e0m vi \u00e9t<br>\nc\u00e1c b\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00e1c d\u1ea1ng vi et<br>\nt\u00ednh vi et<br>\nx1^3+x2^3 vi et<br>\n\u0111\u1ecbnh l\u00fd vi \u00e9t \u0111\u1ea3o<br>\n\u0111\u1ecbnh l\u00fd vi et \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong l\u0129nh v\u1ef1c n\u00e0o<br>\nc\u00e1ch l\u00e0m b\u00e0i vi \u00e9t<br>\n\u1ee9ng d\u1ee5ng c\u1ee7a vi \u00e9t<br>\nhe\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi et x1^2-x2^2<br>\nc\u00f4ng th\u1ee9c h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nto\u00e1n 9 vi \u00e9t<br>\nc\u00e1c b\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi-et<br>\n\u0111\u1ecbnh l\u00fd vi et cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nb\u00e0i to\u00e1n vi \u00e9t<br>\nvi \u00e9t gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\nvi \u00e9t \u0111\u1ed1i x\u1ee9ng<br>\nto\u00e1n 9 b\u00e0i 6 h\u1ec7 th\u1ee9c vi-\u00e9t<br>\nph\u00e1t bi\u1ec3u h\u1ec7 th\u1ee9c vi \u00e9t<br>\nd\u1ecbnh l\u00ed vi et<br>\nto\u00e1n 9 t\u1eadp 2 b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t<br>\nbeaufort london vi et armis<br>\nc\u00e1c c\u00e1ch bi\u1ebfn \u0111\u1ed5i vi \u00e9t<br>\nscience et vi<br>\nvi et armis beaufort london<br>\nc\u00e1ch gi\u1ea3i b\u00e0i to\u00e1n h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00e1c b\u00e0i to\u00e1n v\u1ec1 h\u1ec7 th\u1ee9c vi-\u00e9t l\u1edbp 9<br>\nh\u1ec7 th\u01b0\u1ee9c vi et<br>\nc\u00e1c b\u00e0i to\u00e1n vi \u00e9t<br>\ngi\u1ea3i to\u00e1n vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t l\u1edbp 9<br>\ngiai bai tap he thuc vi et va ung dung<br>\nc\u00e1c d\u1ea1ng vi \u00e9t l\u1edbp 9<br>\ngi\u1ea3i b\u00e0i t\u1eadp to\u00e1n 9 h\u1ec7 th\u1ee9c vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t cho h\u00e0m b\u1eadc 3<br>\n\u0111\u1ecbnh l\u00ed vi et thu\u1eadn<br>\nh\u1ec7 th\u1ee9c vi \u00e9t gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\nc\u00e1c d\u1ea1ng c\u00e2u vi \u00e9t<br>\nb\u00e0i 6 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nch\u1ee9ng minh \u0111\u1ecbnh l\u00fd vi et<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t c\u00f4ng th\u1ee9c<br>\n\u1ee9ng d\u1ee5ng vi et<br>\ncong thuc dinh ly vi et<br>\ndinh ly vi et bac 3<br>\nd\u1ecbnh l\u00fd vi et<br>\nvi \u00e9t x1 &#8211; x2<br>\nc\u00f4ng th\u1ee9c vi \u00e9t x1-x2<br>\nchuy\u00ean \u0111\u1ec1 vi et to\u00e1n 9<br>\n\u0111\u1ecbnh l\u00ed vi-et b\u1eadc 3<br>\ncac cach giai bai toan vi-et<br>\nvi \u00e9t cho pt b\u1eadc 3<br>\nvi-et b\u1eadc 3<br>\nchuy\u00ean \u0111\u1ec1 h\u1ec7 th\u1ee9c vi et<br>\n\u1ee9ng d\u1ee5ng c\u1ee7a \u0111\u1ecbnh l\u00ed vi-\u00e9t<br>\nc\u00e1c d\u1ea1ng b\u00e0i t\u1eadp vi et<br>\nvi \u00e9t m\u0169 3<br>\nb\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi-et<br>\n\u0111i\u1ec1u ki\u1ec7n vi \u00e9t<br>\nc\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi et<br>\nh\u1ec7 th\u1ee9c vi \u00e9t n\u00e2ng cao<br>\ndinh li vi-et<br>\nchuy\u00ean \u0111\u1ec1 vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng s\u00e1ch b\u00e0i t\u1eadp<br>\nai l\u00e0 tri\u1ec7u ph\u00fa h\u1ecfi: \u0111\u1ecbnh l\u00fd vi-\u00e9t \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong l\u0129nh v\u1ef1c n\u00e0o?<br>\ngi\u1ea3i b\u00e0i to\u00e1n vi \u00e9t<br>\nb\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\n\u0111\u1ecbnh l\u00ed vi et cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nvi et ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2<br>\n\u0111\u1ecbnh l\u00fd vi et l\u00e0 g\u00ec<br>\nvi \u00e9t x1+2&#215;2=1<br>\nvi \u00e9t c\u00f3 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\npt vi \u00e9t<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-\u00e9t l\u1edbp 10<br>\nvi \u00e9t t\u1ed5ng t\u00edch<br>\nb\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi \u00e9t l\u1edbp 9<br>\n\u0111\u1ecbnh l\u00fd vi et \u0111\u1ea3o<br>\nb\u00e0i gi\u1ea3ng h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nvi -et<br>\nb\u00e0i t\u1eadp vi-\u00e9t kh\u00f4ng \u0111\u1ed1i x\u1ee9ng<br>\nc\u00e1ch gi\u1ea3i to\u00e1n vi \u00e9t<br>\nc\u00e1ch gi\u1ea3i vi \u00e9t c\u00f3 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-\u00e9t l\u1edbp 9<br>\nb\u00e0i t\u1eadp \u0111\u1ecbnh l\u00ed vi \u00e9t<br>\n\u1ea3nh vi \u00e9t<br>\nvi \u00e9t s p<br>\nc\u00e1c b\u00e0i to\u00e1n vi-\u00e9t thi v\u00e0o l\u1edbp 10<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi-\u00e9t<br>\n\u00e1p d\u1ee5ng h\u1ec7 th\u1ee9c vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng b\u00e0i 25<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng l\u00fd thuy\u1ebft<br>\nh\u1ec7 th\u1ee9c vi et v\u00e0 \u1ee9ng d\u1ee5ng<br>\nvi \u00e9t pt b\u1eadc 3<br>\ngi\u1ea3i vi et<br>\nc\u00e1c d\u1ea1ng to\u00e1n h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00e1ch \u00e1p d\u1ee5ng h\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi-\u00e9t kh\u00f4ng \u0111\u1ed1i x\u1ee9ng<br>\nc\u00e1c b\u00e0i to\u00e1n li\u00ean quan \u0111\u1ebfn h\u1ec7 th\u1ee9c vi-et<br>\nc\u00e1ch l\u00e0m b\u00e0i to\u00e1n vi \u00e9t<br>\nchuy\u00ean \u0111\u1ec1 h\u1ec7 th\u1ee9c vi et v\u00e0 \u1ee9ng d\u1ee5ng violet<br>\n\u0111inh l\u00ed vi et<br>\nvi \u00e9t kh\u00f4ng \u0111\u1ed1i x\u1ee9ng c\u00f3 \u0111\u00e1p \u00e1n<br>\nvi \u00e9t x1^2-x2^2<br>\nbi\u1ec3u th\u1ee9c vi \u00e9t<br>\nvi et n\u00e2ng cao<br>\nc\u00e1c b\u00e0i t\u1eadp n\u00e2ng cao v\u1ec1 h\u1ec7 th\u1ee9c vi-\u00e9t<br>\nsex vi et<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t \u0111\u1ea3o<br>\nhe thuc vi et va ung dung<br>\nc\u00f4ng th\u1ee9c vi \u00e9t \u0111\u1ea3o<br>\nb\u00e0i t\u1eadp \u00e1p d\u1ee5ng h\u1ec7 th\u1ee9c vi \u00e9t<br>\ndli vi et<br>\nchuyen de he thuc vi et<br>\n\u0111\u1ecbnh ly vi et<br>\nh\u1ec7 th\u1ee9c vi \u00e9t sbt<br>\ngi\u1ea3i vi-et<br>\nh\u1ec7 vi \u00e9t<br>\nvi-\u00e9t kh\u00f4ng \u0111\u1ed1i x\u1ee9ng c\u00f3 \u0111\u00e1p \u00e1n<br>\nb\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\n\u0111\u1ecbnh lu\u1eadt vi-\u00e9t<br>\nc\u00e1ch bi\u1ebfn \u0111\u1ed5i vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi \u00e9t l\u00e0 g\u00ec<br>\nvi-et cho pt bac 3<br>\nnh\u00e0 to\u00e1n h\u1ecdc vi-et<br>\ngi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi-\u00e9t \u0111\u1ea3o<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng to\u00e1n 9<br>\nb\u00e0i t\u1eadp vi et<br>\n\u00e1p d\u1ee5ng vi \u00e9t<br>\nc\u00e1c h\u1eb1ng \u0111\u1eb3ng th\u1ee9c vi \u00e9t<br>\nb\u00e0i t\u1eadp h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00e1c b\u00e0i to\u00e1n vi-\u00e9t kh\u00f3<br>\nluy\u1ec7n t\u1eadp h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nvi \u00e9t n\u00e2ng cao<br>\nto\u00e1n l\u1edbp 9 b\u00e0i h\u1ec7 th\u1ee9c vi-\u00e9t<br>\nbeaufort vi et armis<br>\ngiai toan vi et<br>\nc\u00e1c d\u1ea1ng b\u00e0i t\u1eadp vi \u00e9t<br>\nvi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nd\u00f9ng h\u1ec7 th\u1ee9c vi \u00e9t \u0111\u1ec3 t\u00ednh nh\u1ea9m nghi\u1ec7m<br>\nc\u00e1c d\u1ea1ng vi \u00e9t n\u00e2ng cao<br>\nt\u1ea5t c\u1ea3 c\u00f4ng th\u1ee9c vi \u00e9t<br>\nvi-et bac 2<br>\nvi \u00e9t ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\ncac cong thuc vi et<br>\nvi-et \u0111\u1ecbnh l\u00fd<br>\ndinh ly vi-et<br>\ntoan 9 he thuc vi et<br>\nh\u1ec7 th\u1ee9c vi et ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\ngi\u1ea3i sgk to\u00e1n 9 b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00e1c d\u1ea1ng b\u00e0i vi et<br>\nc\u00e1c d\u1ea1ng \u0111\u1ec1 vi \u00e9t<br>\nb\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t<br>\nb\u00e0i t\u1eadp vi \u00e9t n\u00e2ng cao<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi \u00e9t l\u1edbp 9<br>\nto\u00e1n vi et<br>\nc\u00f4ng th\u1ee9c t\u00ednh vi-\u00e9t<br>\nh\u1eb1ng \u0111\u1eb3ng th\u1ee9c trong vi \u00e9t<br>\nc\u00e1c d\u1ea1ng to\u00e1n v\u1ec1 vi \u00e9t<br>\nd\u1ea1ng to\u00e1n vi \u00e9t<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t n\u00e2ng cao<br>\nc\u00e1ch gi\u1ea3i vi et kh\u00f4ng \u0111\u1ed1i x\u1ee9ng<br>\nvi et nam<br>\n\u0111\u1ecbnh l\u00fd vi-\u00e9t to\u00e1n<br>\nvi \u00e9t c\u00f3 c\u0103n<br>\nvi \u00e9t c\u1ee7a h\u00e0m b\u1eadc 3<br>\nh\u1ec7 th\u1ee9c vi \u00e9t c\u00f4ng th\u1ee9c<br>\n\u1ee9ng d\u1ee5ng \u0111\u1ecbnh l\u00ed vi \u00e9t<br>\nh\u1ec7 th\u1ee9c vi \u00e9t cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nb\u00e0i to\u00e1n vi et l\u1edbp 9<br>\nbai tap vi et<br>\nc\u00e1c d\u1ea1ng b\u00e0i to\u00e1n v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nh\u1ec7 th\u00fac vi \u00e9t<br>\nd\u0111\u1ecbnh l\u00fd vi-et<br>\nc\u00e1ch gi\u1ea3i vi-\u00e9t kh\u00f4ng \u0111\u1ed1i x\u1ee9ng<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng l\u1edbp 9<br>\nto\u00e1n 9 b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nvi \u00e9t.<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t thu\u1eadn<br>\ngi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i vi \u00e9t<br>\ndinh ly vi et ai la trieu phu<br>\n\u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 \u00e1p d\u1ee5ng h\u1ec7 th\u1ee9c vi \u00e9t<br>\nc\u00e1c d\u1ea1ng b\u00e0i v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nm\u1ed9t s\u1ed1 b\u00e0i to\u00e1n v\u1ec1 vi \u00e9t<br>\n\u1ee9ng d\u1ee5ng c\u1ee7a h\u1ec7 th\u1ee9c vi-et<br>\nh\u1ec7 th\u1ee9 vi \u00e9t<br>\nvi \u00e9t t\u00ecm gi\u00e1 tr\u1ecb nh\u1ecf nh\u1ea5t<br>\nhva mener vi med kjemiske egenskaper for et metall<br>\n\u0111inh l\u00fd vi \u00e9t<br>\nb\u00e0i vi \u00e9t<br>\nb\u00e0i t\u1eadp vi \u00e9t c\u00f3 \u0111\u00e1p \u00e1n<br>\ncac dang bai tap vi et<br>\nc\u00e1c b\u00e0i t\u1eadp vi \u00e9t<br>\ngi\u1ea3i h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nvi \u00e9t x1=2&#215;2<br>\ngiai bai tap toan so lop 9 bai he thuc vi et<br>\nh\u1ec7 th\u1ee9c vi \u00e9t b\u00e0i t\u1eadp<br>\nchuy\u00ean \u0111\u1ec1 v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nb\u00e0i t\u1eadp vi-et l\u1edbp 9<br>\nto\u00e1n 9 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi \u00e9t ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2<br>\nvi-et b\u1eadc 2<br>\nc\u00e1c d\u1ea1ng b\u00e0i vi-\u00e9t thi v\u00e0o l\u1edbp 10<br>\nc\u00e1c b\u00e0i vi \u00e9t<br>\nnh\u1eefng b\u00e0i to\u00e1n vi \u00e9t<br>\ndinh ly vi et va ung dung<br>\nb\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi et armis beaufort<br>\nso\u1ea1n to\u00e1n 9 h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng<br>\nchuy\u00ean \u0111\u1ec1 h\u1ec7 th\u1ee9c vi et v\u00e0 \u1ee9ng d\u1ee5ng<br>\n\u0111inh ly vi et<br>\nhe th\u1ee9c vi et<br>\nc\u00e1c b\u00e0i to\u00e1n v\u1ec1 h\u1ec7 th\u1ee9c vi-et<br>\nvi \u00e9t n\u00e2ng cao l\u1edbp 9<br>\nd\u00f9ng h\u1ec7 th\u1ee9c vi \u00e9t t\u00ednh nh\u1ea9m nghi\u1ec7m<br>\nc\u00f4ng th\u1ee9c \u0111\u1ecbnh l\u00fd vi \u00e9t<br>\ngi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i trong vi \u00e9t<br>\nvi-et n\u00e2ng cao<br>\nb\u00e0i t\u1eadp v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t l\u1edbp 9<br>\nc\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 vi \u00e9t<br>\nvi \u00e9t cho ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 3<br>\nht vi et<br>\nc\u00e1ch l\u00e0m to\u00e1n vi \u00e9t<br>\nvi et 3 s\u1ed1<br>\nc\u00f4ng th\u1ee9c nghi\u1ec7m vi \u00e9t<br>\n\u0111\u1ecbnh l\u00fa vi \u00e9t<br>\ntheo h\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi \u00e9t c\u00f3 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\n\u0111i\u1ecbnh l\u00fd vi et<br>\nc\u00e1ch gi\u1ea3i b\u00e0i to\u00e1n vi-\u00e9t<br>\nc\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a h\u1ec7 th\u1ee9c vi et<br>\n\u0111\u1ec1 vi \u00e9t<br>\n\u00f4ng vi \u00e9t<br>\ndinh ly vi et phuong trinh bac 2<br>\nvi \u00e9t l\u1edbp 10<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi \u00e9t thi v\u00e0o 10<br>\ns\u00e5 tenner vi et lys i kveld<br>\nc\u00f4ng th\u1ee9c \u0111\u1ecbnh l\u00ed vi-\u00e9t<br>\nh\u1ec7 th\u1ee9c vi \u00e9t to\u00e1n 9<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t x1-x2<br>\ngi\u1ea3i vi \u00e9t c\u00f3 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\nb\u00e0i t\u1eadp vi \u00e9t thi v\u00e0o 10<br>\ndinh ly vi et trong vat ly<br>\ngi\u1ea3i to\u00e1n 9 t\u1eadp 2 h\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi-\u00e9t m\u1edf r\u1ed9ng<br>\nchuy\u00ean \u0111\u1ec1 vi-\u00e9t thi v\u00e0o l\u1edbp 10<br>\ndat vi et<br>\ndinh ly vi et la gi<br>\nvi \u00e9t x1^3 &#8211; x2^3<br>\nbai tap vi-et<br>\nc\u00e1c h\u1ec7 th\u1ee9c vi \u00e9t<br>\nvi et bac 4<br>\ndinh l\u00fd vi et<br>\n\u0111\u1ecbnh l\u00ed vi \u00e9t b\u00e0i t\u1eadp<br>\nb\u00e0i t\u1eadp \u0111\u1ecbnh l\u00ed vi \u00e9t l\u1edbp 9<br>\nph\u00e2n t\u00edch vi \u00e9t<br>\nc\u00e1c ph\u00e9p bi\u1ebfn \u0111\u1ed5i vi \u00e9t<br>\nc\u00f4ng th\u1ee9c bi\u1ebfn \u0111\u1ed5i vi \u00e9t<br>\ngi\u1ea3i b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\ntoan 9 he thuc vi et va ung dung<br>\nh\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng bai tap<br>\nh\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng l\u1edbp 9<br>\nc\u00f4ng th\u1ee9c to\u00e1n vi \u00e9t<br>\nhvordan f\u00e5r vi et godt parforhold<br>\nchuy\u00ean \u0111\u1ec1 vi et<br>\ngi\u1ea3i to\u00e1n b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nc\u00e1c d\u1ea1ng to\u00e1n vi et<br>\nh\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng violet<br>\ndinh ly vi et duoc ap dung trong linh vuc nao<br>\n6 h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nh\u1ec7 th\u1ee9c vi \u00e9t l\u1edbp 9<br>\nx1^2-x2^2 vi et<br>\nvi \u00e9t 3 s\u1ed1<br>\ngi\u1ea3i to\u00e1n 9 t\u1eadp 2 b\u00e0i h\u1ec7 th\u1ee9c vi \u00e9t<br>\ngi\u1ea3i b\u00e0i 6 h\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nvi \u00e9t ch\u1ee9a gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i<br>\nchuy\u00ean \u0111\u1ec1 vi et l\u1edbp 9<br>\nnghi\u1ec7m vi \u00e9t<br>\nd\u1ecbnh l\u00fd vi \u00e9t<br>\ns\u00e5 tenner vi et lys<br>\ntheo \u0111\u1ecbnh l\u00ed vi \u00e9t<br>\ngi\u1ea3i to\u00e1n h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng<br>\nh\u1ec7 th\u1ee9c vi-\u00e9t v\u00e0 \u1ee9ng d\u1ee5ng luy\u1ec7n t\u1eadp<br>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Trong ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n h\u1ecdc l\u1edbp 9, h\u1ec7 th\u1ee9c vi \u00e9t v\u00e0 \u1ee9ng d\u1ee5ng l\u00e0 ki\u1ebfn th\u1ee9c quan tr\u1ecdng \u0111\u1ec3 \u00e1p d\u1ee5ng trong h\u1ea7u h\u1ebft c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp. \u0110\u1ec3 \u00f4n t\u1eadp c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 h\u1ec7 th\u1ee9c vi \u00e9t l\u1edbp 9 n\u00e0y v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3. H\u00e3y [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2255,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[9],"tags":[],"class_list":["post-993","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/993","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=993"}],"version-history":[{"count":17,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/993\/revisions"}],"predecessor-version":[{"id":25682,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/993\/revisions\/25682"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media\/2255"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}