{"id":1124,"date":"2026-05-05T06:18:12","date_gmt":"2026-05-05T06:18:12","guid":{"rendered":"https:\/\/79.buffdemo.com\/index.php\/2026\/05\/05\/bo-de-thi-giua-ki-2-toan-9\/"},"modified":"2026-05-05T07:59:42","modified_gmt":"2026-05-05T07:59:42","slug":"bo-de-thi-giua-ki-2-toan-9","status":"publish","type":"post","link":"https:\/\/79.buffdemo.com\/index.php\/2026\/05\/05\/bo-de-thi-giua-ki-2-toan-9\/","title":{"rendered":"B\u1ed9 \u0110\u1ec1 Thi Gi\u1eefa K\u00ec 2 To\u00e1n 9 Ch\u01b0\u01a1ng Tr\u00ecnh M\u1edbi C\u00f3 \u0110\u00e1p \u00c1n"},"content":{"rendered":"<p>K\u00ec thi gi\u1eefa k\u00ec 2 to\u00e1n 9 \u0111ang \u0111\u1ebfn r\u1ea5t g\u1ea7n. Ch\u1eafc h\u1eb3n b\u1ea1n \u0111ang b\u0103n kho\u0103n t\u00ecm t\u00e0i li\u1ec7u \u00f4n t\u1eadp hi\u1ec7u qu\u1ea3 cho c\u00e1c chuy\u00ean \u0111\u1ec1 quan tr\u1ecdng nh\u01b0 h\u00e0m s\u1ed1 $y=ax^2$ v\u00e0 h\u00ecnh h\u1ecdc \u0111\u01b0\u1eddng tr\u00f2n. Vi\u1ec7c ph\u1ea3i t\u00ecm ki\u1ebfm b\u1ed9 \u0111\u1ec1 chu\u1ea9n c\u1ea5u tr\u00fac \u00e1p d\u1ee5ng chung cho c\u1ea3 3 b\u1ed9 s\u00e1ch gi\u00e1o khoa l\u00e0 th\u00e1ch th\u1ee9c l\u1edbn nh\u1ea5t l\u00fac n\u00e0y. <strong>B\u1ed9 \u0110\u1ec1 Thi Gi\u1eefa K\u00ec 2 To\u00e1n 9<\/strong> ch\u00ednh l\u00e0 gi\u1ea3i ph\u00e1p ch\u1ea5t l\u01b0\u1ee3ng cao, gi\u00fap b\u1ea1n n\u1eafm ch\u1eafc m\u1ecdi d\u1ea1ng b\u00e0i. H\u00e3y c\u00f9ng <a href=\"https:\/\/tailieuonthi.edu.vn\/\" rel=\"noopener\" target=\"_blank\"><strong>T\u00e0i Li\u1ec7u \u00d4n Thi<\/strong><\/a> kh\u00e1m ph\u00e1 nh\u1eefng gi\u00e1 tr\u1ecb \u0111\u1eb7c bi\u1ec7t m\u00e0 b\u1ed9 \u0111\u1ec1 n\u00e0y mang l\u1ea1i nh\u00e9!<\/p>\n<h2><strong>\u0110i\u1ec3m n\u1ed5i b\u1eadt c\u1ee7a B\u1ed9 \u0110\u1ec1 Thi Gi\u1eefa K\u00ec 2 To\u00e1n 9<\/strong><\/h2>\n<p>B\u1ed9 \u0111\u1ec1 thi n\u00e0y l\u00e0 c\u00f4ng c\u1ee5 luy\u1ec7n t\u1eadp t\u1ed1t nh\u1ea5t cho h\u1ecdc sinh l\u1edbp 9, gi\u00fap vi\u1ec7c \u00f4n thi tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n.<\/p>\n<ul>\n<li><strong>D\u00f9ng t\u1ed1t cho m\u1ecdi b\u1ed9 s\u00e1ch:<\/strong> B\u1ea1n s\u1ebd c\u00f3 t\u00e0i li\u1ec7u t\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c \u0111\u1ea7y \u0111\u1ee7 m\u00e0 kh\u00f4ng c\u1ea7n lo l\u1eafng v\u1ec1 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh.<\/li>\n<li><strong>\u0110\u1ee7 m\u1ecdi c\u1ea5u tr\u00fac \u0111\u1ec1 thi:<\/strong> T\u00e0i li\u1ec7u cung c\u1ea5p c\u1ea3 \u0111\u1ec1 thi tr\u1eafc nghi\u1ec7m v\u00e0 t\u1ef1 lu\u1eadn gi\u00fap b\u1ea1n l\u00e0m quen v\u1edbi m\u1ecdi d\u1ea1ng \u0111\u1ec1 thi \u1edf tr\u01b0\u1eddng, v\u1eeba luy\u1ec7n t\u1ed1c \u0111\u1ed9 l\u00e0m tr\u1eafc nghi\u1ec7m, v\u1eeba r\u00e8n k\u1ef9 n\u0103ng gi\u1ea3i v\u00e0 tr\u00ecnh b\u00e0y t\u1ef1 lu\u1eadn chi ti\u1ebft.<\/li>\n<li><strong>Ph\u00e2n lo\u1ea1i r\u00f5 r\u00e0ng:<\/strong> C\u00e1c c\u00e2u h\u1ecfi trong \u0111\u1ec1 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo m\u1ee9c \u0111\u1ed9 t\u1eeb d\u1ec5 \u0111\u1ebfn kh\u00f3. Vi\u1ec7c n\u00e0y gi\u00fap b\u1ea1n d\u1ec5 d\u00e0ng \u00f4n t\u1eadp theo l\u1ed9 tr\u00ecnh, t\u1eeb n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ebfn chinh ph\u1ee5c c\u00e1c b\u00e0i to\u00e1n kh\u00f3 \u0111\u1ec3 l\u1ea5y \u0111i\u1ec3m tuy\u1ec7t \u0111\u1ed1i.<\/li>\n<\/ul>\n<h2><strong>N\u1ed9i dung B\u1ed9 \u0110\u1ec1 Thi Gi\u1eefa K\u00ec 2 To\u00e1n 9<\/strong><\/h2>\n<p>B\u1ed9 <a href=\"https:\/\/tailieuonthi.edu.vn\/lop-9\/toan-9\/\" rel=\"noopener\" target=\"_blank\"><strong>t\u00e0i li\u1ec7u to\u00e1n 9<\/strong><\/a> t\u1eadp trung v\u00e0o c\u00e1c chuy\u00ean \u0111\u1ec1 tr\u1ecdng t\u00e2m nh\u1ea5t c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n 9 h\u1ecdc k\u1ef3 II, gi\u00fap b\u1ea1n \u00f4n t\u1eadp \u0111\u00fang tr\u1ecdng \u0111i\u1ec3m v\u00e0 kh\u00f4ng b\u1ecf s\u00f3t ki\u1ebfn th\u1ee9c.<\/p>\n<h3><strong>Ph\u1ea7n \u0111\u1ec1 b\u00e0i<\/strong><\/h3>\n<p>C\u00e1c chuy\u00ean \u0111\u1ec1 ch\u00ednh th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n trong \u0111\u1ec1 gi\u1eefa k\u00ec 2 bao g\u1ed3m:<\/p>\n<ul>\n<li>H\u00e0m s\u1ed1 b\u1eadc hai v\u00e0 \u0111\u1ed3 th\u1ecb parabol<\/li>\n<li>Ph\u01b0\u01a1ng tr\u00ecnh \u2013 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc hai<\/li>\n<li>\u0110\u1ecbnh l\u00fd Vi\u00e8te v\u00e0 \u1ee9ng d\u1ee5ng<\/li>\n<li>H\u00ecnh h\u1ecdc: g\u00f3c n\u1ed9i ti\u1ebfp, \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp, t\u1ee9 gi\u00e1c n\u1ed9i ti\u1ebfp<\/li>\n<li>B\u00e0i to\u00e1n th\u1ef1c t\u1ebf: di\u1ec7n t\u00edch, h\u00ecnh h\u1ecdc t\u1ecda \u0111\u1ed9, \u1ee9ng d\u1ee5ng ph\u00e9p quay<\/li>\n<\/ul>\n<p>\u0110\u1ec1 thi \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp h\u1ee3p l\u00fd, t\u1eeb c\u00e2u h\u1ecfi c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao:<\/p>\n<ul>\n<li>Nh\u1eadn bi\u1ebft: \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c, \u0111\u1ecbnh ngh\u0129a.<\/li>\n<li>Th\u00f4ng hi\u1ec3u: Gi\u1ea3i th\u00edch, bi\u1ebfn \u0111\u1ed5i, nh\u1eadn d\u1ea1ng d\u1ea1ng to\u00e1n.<\/li>\n<li>V\u1eadn d\u1ee5ng: \u00c1p d\u1ee5ng ki\u1ebfn th\u1ee9c v\u00e0o t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3.<\/li>\n<li>V\u1eadn d\u1ee5ng cao: B\u00e0i to\u00e1n t\u1ed5ng h\u1ee3p, y\u00eau c\u1ea7u t\u01b0 duy logic.<\/li>\n<\/ul>\n<h3><strong>Ph\u1ea7n \u0111\u00e1p \u00e1n<\/strong><\/h3>\n<p>M\u1ed7i \u0111\u1ec1 thi \u0111\u1ec1u \u0111i k\u00e8m \u0111\u00e1p \u00e1n v\u00e0 l\u1eddi gi\u1ea3i chi ti\u1ebft t\u1eebng b\u01b0\u1edbc. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ea1n d\u1ec5 d\u00e0ng so s\u00e1nh, t\u00ecm ra l\u1ed7i sai v\u00e0 h\u1ecdc \u0111\u01b0\u1ee3c c\u00e1ch tr\u00ecnh b\u00e0y b\u00e0i t\u1ef1 lu\u1eadn sao cho \u0111\u1ea1t \u0111i\u1ec3m cao nh\u1ea5t. B\u1ea1n s\u1ebd kh\u00f4ng s\u1ee3 t\u00ecnh tr\u1ea1ng \u201cch\u1ec9 bi\u1ebft k\u1ebft qu\u1ea3 m\u00e0 kh\u00f4ng hi\u1ec3u c\u00e1ch l\u00e0m\u201d.<\/p>\n<p><img loading=\"lazy\" alt=\"\" class=\"aligncenter size-full wp-image-6234\" decoding=\"async\" height=\"1131\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" src=\"https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-3.jpg\" srcset=\"https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-3.jpg 800w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-3-212x300.jpg 212w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-3-724x1024.jpg 724w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-3-768x1086.jpg 768w\" width=\"800\"\/> <img loading=\"lazy\" alt=\"\" class=\"aligncenter size-full wp-image-6235\" decoding=\"async\" height=\"1131\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" src=\"https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-2.jpg\" srcset=\"https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-2.jpg 800w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-2-212x300.jpg 212w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-2-724x1024.jpg 724w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-2-768x1086.jpg 768w\" width=\"800\"\/> <img alt=\"\" class=\"aligncenter size-full wp-image-6236\" decoding=\"async\" height=\"1131\" loading=\"lazy\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" src=\"https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-1.jpg\" srcset=\"https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-1.jpg 800w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-1-212x300.jpg 212w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-1-724x1024.jpg 724w, https:\/\/tailieuonthi.edu.vn\/wp-content\/uploads\/2025\/11\/bo-de-thi-giua-ki-2-toan-9-1-768x1086.jpg 768w\" width=\"800\"\/><\/p>\n<h2><strong>T\u1ea3i B\u1ed9 \u0110\u1ec1 Thi Gi\u1eefa K\u00ec 2 To\u00e1n 9<\/strong><\/h2>\n<p>\u0110\u1ec3 c\u00f3 ngay c\u00f4ng c\u1ee5 \u00f4n t\u1eadp to\u00e0n di\u1ec7n n\u00e0y v\u00e0 b\u1eaft \u0111\u1ea7u luy\u1ec7n t\u1eadp ngay l\u1eadp t\u1ee9c, b\u1ea1n h\u00e3y ch\u1ecdn t\u1ea3i v\u1ec1 phi\u00ean b\u1ea3n ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u c\u1ee7a m\u00ecnh d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n<p><a class=\"custom-button\" href=\"https:\/\/drive.google.com\/drive\/folders\/1yZ9h9TwOVElI6oaFNZljgXl1425wyOKL\" rel=\"nofollow noopener\" target=\"_blank\">T\u1ea3i B\u1ed9 \u0110\u1ec1 Thi Gi\u1eefa K\u00ec 2 To\u00e1n 9 n\u0103m 2025 (K\u1ebft N\u1ed1i Tri th\u1ee9c)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>K\u00ec thi gi\u1eefa k\u00ec 2 to\u00e1n 9 \u0111ang \u0111\u1ebfn r\u1ea5t g\u1ea7n. Ch\u1eafc h\u1eb3n b\u1ea1n \u0111ang b\u0103n kho\u0103n t\u00ecm t\u00e0i li\u1ec7u \u00f4n t\u1eadp hi\u1ec7u qu\u1ea3 cho c\u00e1c chuy\u00ean \u0111\u1ec1 quan tr\u1ecdng nh\u01b0 h\u00e0m s\u1ed1 $y=ax^2$ v\u00e0 h\u00ecnh h\u1ecdc \u0111\u01b0\u1eddng tr\u00f2n. Vi\u1ec7c ph\u1ea3i t\u00ecm ki\u1ebfm b\u1ed9 \u0111\u1ec1 chu\u1ea9n c\u1ea5u tr\u00fac \u00e1p d\u1ee5ng chung cho c\u1ea3 3 b\u1ed9 [&#8230;]\n","protected":false},"author":1,"featured_media":2322,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[113],"tags":[114],"class_list":["post-1124","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-toan-9","tag-toan-9"],"_links":{"self":[{"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/posts\/1124","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/comments?post=1124"}],"version-history":[{"count":1,"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/posts\/1124\/revisions"}],"predecessor-version":[{"id":2323,"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/posts\/1124\/revisions\/2323"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/media\/2322"}],"wp:attachment":[{"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/media?parent=1124"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/categories?post=1124"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/79.buffdemo.com\/index.php\/wp-json\/wp\/v2\/tags?post=1124"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}