{"id":76,"date":"2026-11-09T08:00:00","date_gmt":"2026-11-09T01:00:00","guid":{"rendered":"https:\/\/thanhtuyen.edu.vn\/blog\/?p=76"},"modified":"2026-11-10T16:04:40","modified_gmt":"2026-11-10T09:04:40","slug":"cach-hoc-toan-gioi-lop-9","status":"publish","type":"post","link":"https:\/\/thanhtuyen.edu.vn\/blog\/cach-hoc-toan-gioi-lop-9","title":{"rendered":"C\u00e1ch h\u1ecdc to\u00e1n gi\u1ecfi l\u1edbp 9: ph\u01b0\u01a1ng ph\u00e1p t\u1eeb n\u1ec1n t\u1ea3ng"},"content":{"rendered":"<h1>C\u00e1ch h\u1ecdc to\u00e1n gi\u1ecfi l\u1edbp 9: ph\u01b0\u01a1ng ph\u00e1p t\u1eeb n\u1ec1n t\u1ea3ng<\/h1>\n<p>Con v\u00e0o l\u1edbp 9, m\u00f4n To\u00e1n chi\u1ebfm m\u1ed9t trong ba m\u00f4n thi v\u00e0o l\u1edbp 10 \u2014 To\u00e1n, Ng\u1eef v\u0103n v\u00e0 Khoa h\u1ecdc t\u1ef1 nhi\u00ean (b\u1ed9 ba m\u00f4n \u0111\u00e3 c\u00f3 b\u00e0i ri\u00eang: <a href=\"https:\/\/thanhtuyen.edu.vn\/blog\/mon-thi-vao-lop-10-tuyen-quang\">m\u00f4n thi v\u00e0o l\u1edbp 10 Tuy\u00ean Quang<\/a>). C\u1ea1nh tranh c\u0169ng th\u1ea5y r\u00f5 qua k\u1ef3 thi v\u1eeba qua: n\u0103m 2026 c\u00f3 h\u01a1n 22.900 th\u00ed sinh l\u00e0m th\u1ee7 t\u1ee5c d\u1ef1 thi v\u00e0o l\u1edbp 10 tr\u00ean to\u00e0n t\u1ec9nh (theo B\u00e1o Tuy\u00ean Quang ng\u00e0y 26\/5\/2026, d\u1eabn S\u1edf GD&amp;\u0110T), ri\u00eang Tr\u01b0\u1eddng THPT Chuy\u00ean Tuy\u00ean Quang c\u00f3 933 th\u00ed sinh \u0111\u0103ng k\u00fd cho 490 ch\u1ec9 ti\u00eau. V\u1edbi c\u00e1c con l\u1edbp 9 hi\u1ec7n t\u1ea1i, k\u1ef3 thi t\u1edbi d\u1ef1 ki\u1ebfn kho\u1ea3ng th\u00e1ng 6\/2027 \u2014 c\u00f2n \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 h\u1ecdc cho v\u1eefng, n\u1ebfu h\u1ecdc \u0111\u00fang th\u1ee9 t\u1ef1.<\/p>\n<p>\u0110a s\u1ed1 em h\u1ecdc &quot;ch\u01b0a gi\u1ecfi&quot; To\u00e1n kh\u00f4ng ph\u1ea3i v\u00ec \u00edt h\u1ecdc, m\u00e0 v\u00ec h\u1ecdc sai th\u1ee9 t\u1ef1: l\u00e0m \u0111\u1ec1 tr\u01b0\u1edbc khi v\u00e1 n\u1ec1n, ch\u00e9p l\u1eddi gi\u1ea3i thay v\u00ec t\u1ef1 gi\u1ea3i, sai ch\u1ed7 n\u00e0o b\u1ecf ch\u1ed7 \u0111\u00f3. B\u00e0i d\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1ch h\u1ecdc to\u00e1n gi\u1ecfi l\u1edbp 9 b\u1eaft \u0111\u1ea7u t\u1eeb n\u1ec1n t\u1ea3ng \u2014 m\u1ecdi b\u01b0\u1edbc d\u00f9ng \u0111\u01b0\u1ee3c ngay trong tu\u1ea7n n\u00e0y.<\/p>\n<p><em>C\u1eadp nh\u1eadt ng\u00e0y 05\/11\/2026. Th\u1ec3 l\u1ec7 v\u00e0 th\u1eddi gian thi t\u1eebng m\u00f4n do S\u1edf GD&amp;\u0110T Tuy\u00ean Quang c\u00f4ng b\u1ed1 h\u1eb1ng n\u0103m; b\u00e0i s\u1ebd \u0111\u1ed1i chi\u1ebfu l\u1ea1i khi c\u00f3 v\u0103n b\u1ea3n tuy\u1ec3n sinh 2027.<\/em><\/p>\n<h2>Ba nguy\u00ean nh\u00e2n khi\u1ebfn c\u00e1ch h\u1ecdc to\u00e1n gi\u1ecfi l\u1edbp 9 kh\u00f4ng n\u1eb1m \u1edf vi\u1ec7c h\u1ecdc nhi\u1ec1u<\/h2>\n<p>Trong l\u1edbp n\u00e0o c\u0169ng c\u00f3 em h\u1ecdc To\u00e1n r\u1ea5t ch\u0103m m\u00e0 \u0111i\u1ec3m kh\u00f4ng l\u00ean. Khi ng\u1ed3i l\u1ea1i v\u1edbi ba l\u1ed7i d\u01b0\u1edbi \u0111\u00e2y, ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p kh\u1edbp \u00edt nh\u1ea5t m\u1ed9t l\u1ed7i:<\/p>\n<ul>\n<li><strong>Ch\u00e9p l\u1eddi gi\u1ea3i.<\/strong> Con xem b\u00e0i gi\u1ea3i m\u1eabu r\u1ed3i ch\u00e9p l\u1ea1i cho gi\u1ed1ng, t\u01b0\u1edfng l\u00e0 \u0111\u00e3 bi\u1ebft. \u0110\u1ec1 \u0111\u1ed5i s\u1ed1, \u0111\u1ed5i th\u1ee9 t\u1ef1 b\u01b0\u1edbc l\u00e0 t\u1eafc ngay \u2014 v\u00ec con ghi nh\u1edb h\u00ecnh d\u00e1ng b\u00e0i gi\u1ea3i, kh\u00f4ng ph\u1ea3i l\u1eadp lu\u1eadn \u0111\u1eb1ng sau.<\/li>\n<li><strong>L\u00e0m \u0111\u1ec1 qu\u00e1 s\u1edbm.<\/strong> N\u1ec1n c\u00f2n h\u1ed5ng m\u00e0 luy\u1ec7n \u0111\u1ec1, con sai l\u1eb7p l\u1ea1i tr\u00ean ch\u00ednh ph\u1ea7n y\u1ebfu; c\u00e0ng l\u00e0m c\u00e0ng n\u1ea3n. \u0110\u1ec1 l\u00e0 c\u00f4ng c\u1ee5 \u0111o, kh\u00f4ng ph\u1ea3i c\u00f4ng c\u1ee5 d\u1ea1y ph\u1ea7n n\u1ec1n.<\/li>\n<li><strong>Sai ch\u1ed7 n\u00e0o b\u1ecf ch\u1ed7 \u0111\u00f3.<\/strong> S\u1eeda b\u00e0i xong l\u00e0 g\u1ea5p v\u1edf l\u1ea1i. L\u1ed7i \u0111\u00f3 quay l\u1ea1i \u1edf \u0111\u1ec1 kh\u00e1c, \u1edf b\u00e0i ki\u1ec3m tra kh\u00e1c, v\u00e0 l\u1ea7n sau m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n m\u1edbi ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c.<\/li>\n<\/ul>\n<p>Ba l\u1ed7i \u0111\u1ec1u s\u1eeda \u0111\u01b0\u1ee3c b\u1eb1ng th\u1ee9 t\u1ef1 ng\u01b0\u1ee3c l\u1ea1i: bi\u1ebft m\u00ecnh h\u1ed5ng g\u00ec, luy\u1ec7n \u0111\u00fang ph\u1ea7n \u0111\u00f3, ghi l\u1ed7i l\u1ea1i v\u00e0 quay l\u1ea1i l\u00e0m \u0111\u1ebfn khi g\u1ea1ch \u0111\u01b0\u1ee3c.<\/p>\n<h2>B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean c\u1ee7a c\u00e1ch h\u1ecdc to\u00e1n gi\u1ecfi l\u1edbp 9: bi\u1ebft con \u0111ang h\u1ed5ng \u1edf \u0111\u00e2u<\/h2>\n<p>Cho con l\u00e0m m\u1ed9t b\u00e0i &quot;ch\u1ea9n \u0111o\u00e1n&quot; nh\u1ecf 30\u201345 ph\u00fat \u2014 t\u1ef1 gh\u00e9p t\u1eeb c\u00e1c b\u00e0i ki\u1ec3m tra cu\u1ed1i ch\u01b0\u01a1ng trong s\u00e1ch l\u00e0 \u0111\u1ee7, ch\u01b0a c\u1ea7n \u0111\u1ec1 kh\u00f3. Xong b\u00e0i, \u0111\u00e1nh d\u1ea5u t\u1eebng c\u00e2u sai theo m\u1ea3ng ki\u1ebfn th\u1ee9c, \u0111\u1ed1i chi\u1ebfu v\u1edbi b\u1ea3ng d\u01b0\u1edbi:<\/p>\n<table>\n<thead>\n<tr>\n<th>M\u1ea3ng ki\u1ebfn th\u1ee9c l\u1edbp 9<\/th>\n<th>N\u1ec1n ph\u00eda d\u01b0\u1edbi hay h\u1ed5ng<\/th>\n<th>D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ph\u00e2n th\u1ee9c \u0111\u1ea1i s\u1ed1, r\u00fat g\u1ecdn bi\u1ec3u th\u1ee9c<\/td>\n<td>Quy \u0111\u1ed3ng, h\u1eb1ng \u0111\u1eb3ng th\u1ee9c<\/td>\n<td>\u0110\u00fang b\u01b0\u1edbc \u0111\u1ea7u, sai gi\u1eefa ch\u1eebng b\u00e0i t\u00ednh<\/td>\n<\/tr>\n<tr>\n<td>Ph\u01b0\u01a1ng tr\u00ecnh, h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t<\/td>\n<td>Nh\u00e2n chia \u0111a th\u1ee9c, chuy\u1ec3n v\u1ebf<\/td>\n<td>Bi\u1ebft c\u00e1ch gi\u1ea3i nh\u01b0ng \u0111\u1eb7t \u1ea9n, l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh sai<\/td>\n<\/tr>\n<tr>\n<td>H\u00e0m s\u1ed1 v\u00e0 \u0111\u1ed3 th\u1ecb (y = ax + b)<\/td>\n<td>T\u1ecda \u0111\u1ed9 \u0111i\u1ec3m, t\u00ednh gi\u00e1 tr\u1ecb bi\u1ec3u th\u1ee9c<\/td>\n<td>V\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ed3 th\u1ecb nh\u01b0ng \u0111\u1ecdc kh\u00f4ng ra \u00fd ngh\u0129a<\/td>\n<\/tr>\n<tr>\n<td>Tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng, quan h\u1ec7 trong tam gi\u00e1c<\/td>\n<td>V\u1ebd h\u00ecnh ch\u00ednh x\u00e1c theo \u0111\u1ec1<\/td>\n<td>\u0110\u1ecdc xong \u0111\u1ec1 kh\u00f4ng bi\u1ebft b\u1eaft \u0111\u1ea7u v\u1ebd t\u1eeb \u0111\u00e2u<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u01b0\u1eddng tr\u00f2n, ti\u1ebfp tuy\u1ebfn<\/td>\n<td>G\u00f3c, cung, t\u00ednh ch\u1ea5t h\u00ecnh h\u1ecdc n\u1ec1n<\/td>\n<td>Nh\u1eadn ra t\u00ednh ch\u1ea5t nh\u01b0ng l\u1eadp lu\u1eadn kh\u00f4ng n\u1ed1i \u0111\u01b0\u1ee3c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>B\u1ea3ng n\u00e0y cho ra m\u1ed9t danh s\u00e1ch ng\u1eafn hai\u2013ba m\u1ea3ng c\u1ea7n v\u00e1. Danh s\u00e1ch c\u00e0ng ng\u1eafn c\u00e0ng t\u1ed1t \u2014 \u00f4n d\u00e0n tr\u1ea3i l\u00e0 sai l\u1ea7m m\u00e0 b\u00e0i <a href=\"https:\/\/thanhtuyen.edu.vn\/blog\/ke-hoach-on-thi-vao-lop-10\">k\u1ebf ho\u1ea1ch \u00f4n thi v\u00e0o l\u1edbp 10<\/a> \u0111\u00e3 c\u1ea3nh b\u00e1o. T\u1eeb danh s\u00e1ch \u0111\u00f3, l\u1ecbch h\u1ecdc To\u00e1n c\u1ee7a con m\u1edbi c\u00f3 th\u1ee9 t\u1ef1 th\u1ef1c s\u1ef1.<\/p>\n<h2>B\u1ed1n th\u00f3i quen t\u1ea1o n\u00ean c\u00e1ch h\u1ecdc to\u00e1n gi\u1ecfi l\u1edbp 9<\/h2>\n<p>B\u1ed1n th\u00f3i quen d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ee1 t\u1ed1n th\u1eddi gian h\u01a1n t\u0103ng s\u1ed1 gi\u1edd h\u1ecdc, hi\u1ec7u qu\u1ea3 nh\u1ea5t khi b\u1eaft \u0111\u1ea7u t\u1eeb \u0111\u1ea7u n\u0103m l\u1edbp 9:<\/p>\n<p><strong>1. H\u1ecdc b\u00e0i m\u1edbi theo ba b\u01b0\u1edbc.<\/strong> Tr\u01b0\u1edbc gi\u1edd h\u1ecdc: \u0111\u1ecdc tr\u01b0\u1edbc ph\u1ea7n m\u1edbi 5\u201310 ph\u00fat, \u0111\u00e1nh d\u1ea5u ch\u1ed7 ch\u01b0a hi\u1ec3u \u0111\u1ec3 t\u1eadp trung nghe \u0111\u00fang ch\u1ed7 \u0111\u00f3. T\u1ed1i sau gi\u1edd h\u1ecdc: l\u00e0m l\u1ea1i m\u1ed9t v\u00ed d\u1ee5 c\u1ee7a th\u1ea7y c\u00f4 m\u00e0 kh\u00f4ng nh\u00ecn v\u1edf, r\u1ed3i t\u1ef1 gi\u1ea3i m\u1ed9t b\u00e0i t\u01b0\u01a1ng t\u1ef1. M\u1ed7i ng\u00e0y ch\u1eebng ba m\u01b0\u01a1i ph\u00fat l\u00e0 \u0111\u1ee7; tr\u1ec5 m\u1ed9t ng\u00e0y, ph\u1ea7n sau r\u1ed1i theo v\u00ec To\u00e1n n\u1ed1i ch\u1eb7t v\u00e0o nhau.<\/p>\n<p><strong>2. L\u00e0m \u00edt b\u00e0i m\u00e0 t\u1ef1 l\u00e0m h\u1ebft.<\/strong> V\u1edbi m\u1ed7i m\u1ea3ng \u0111ang v\u00e1, 5\u201310 b\u00e0i t\u1ef1 l\u00e0m tr\u1ecdn v\u1eb9n hi\u1ec7u qu\u1ea3 h\u01a1n ba m\u01b0\u01a1i b\u00e0i xem k\u00e8m \u0111\u00e1p \u00e1n. Quy t\u1eafc: \u0111\u00e1p \u00e1n ch\u1ec9 m\u1edf sau khi con vi\u1ebft ra l\u1eddi gi\u1ea3i c\u1ee7a m\u00ecnh; sai th\u00ec so t\u1eebng b\u01b0\u1edbc t\u00ecm ch\u1ed7 g\u00e3y \u2014 th\u01b0\u1eddng ch\u1ec9 g\u00e3y m\u1ed9t b\u01b0\u1edbc, v\u00e0 \u0111\u00f3 l\u00e0 th\u1ee9 c\u1ea7n luy\u1ec7n th\u00eam.<\/p>\n<p><strong>3. S\u1ed5 l\u1ed7i sai, d\u00f9ng \u0111\u00fang c\u00e1ch.<\/strong> S\u1ed5 l\u1ed7i sai gi\u00fap \u0111\u01b0\u1ee3c khi m\u1ed7i l\u1ed7i ghi \u0111\u1ee7 b\u1ed1n th\u1ee9: \u0111\u1ec1 t\u00f3m t\u1eaft, ch\u1ed7 sai, c\u00e1ch l\u00e0m \u0111\u00fang, ng\u00e0y quay l\u1ea1i l\u00e0m. C\u1ee9 ba\u2013b\u1ed1n ng\u00e0y, con l\u00e0m l\u1ea1i c\u00e1c l\u1ed7i ch\u01b0a g\u1ea1ch; l\u00e0m \u0111\u00fang th\u00ec g\u1ea1ch \u0111i. Cu\u1ed1i th\u00e1ng, ph\u1ea7n l\u1ed7i c\u00f2n l\u1ea1i ch\u00ednh l\u00e0 th\u1ee9 \u0111\u00e1ng mang h\u1ecfi th\u1ea7y c\u00f4 \u2014 h\u1ecfi \u0111\u00fang ch\u1ed7 n\u00ean \u0111\u01b0\u1ee3c ch\u1eefa \u0111\u00fang ch\u1ed7.<\/p>\n<p><strong>4. Tr\u00ecnh b\u00e0y l\u1eddi gi\u1ea3i r\u00f5 t\u1eebng b\u01b0\u1edbc.<\/strong> \u0110\u1ec1 To\u00e1n ch\u1ea5m \u1edf l\u1eadp lu\u1eadn v\u00e0 tr\u00ecnh b\u00e0y: l\u1eddi gi\u1ea3i b\u1ecf b\u01b0\u1edbc, thi\u1ebfu k\u1ebft lu\u1eadn v\u1eabn b\u1ecb tr\u1eeb \u0111i\u1ec3m \u2014 \u0111\u00e3 n\u00f3i trong b\u00e0i m\u00f4n thi v\u00e0o l\u1edbp 10 ph\u00eda tr\u00ean. R\u00e8n ngay t\u1eeb b\u00e0i t\u1eadp \u1edf nh\u00e0: vi\u1ebft theo th\u1ee9 t\u1ef1 gi\u1ea3 thi\u1ebft \u2014 c\u00e1ch l\u00e0m \u2014 k\u1ebft lu\u1eadn, nh\u01b0 \u0111ang gi\u1ea3i th\u00edch cho b\u1ea1n c\u00f9ng b\u00e0n hi\u1ec3u.<\/p>\n<h2>M\u1ed7i tu\u1ea7n h\u1ecdc To\u00e1n bao nhi\u00eau l\u00e0 \u0111\u1ee7?<\/h2>\n<p>Kh\u00f4ng c\u1ea7n nhi\u1ec1u: n\u0103m\u2013s\u00e1u phi\u00ean ng\u1eafn 30\u201345 ph\u00fat m\u1ed7i tu\u1ea7n \u0111\u1ec1u \u0111\u1ec1u hi\u1ec7u qu\u1ea3 h\u01a1n m\u1ed9t bu\u1ed5i ng\u1ed3i ba gi\u1edd li\u1ec1n. M\u1ed9t c\u00e1ch ph\u00e2n b\u1ed5 m\u1eabu:<\/p>\n<ul>\n<li>Ba\u2013b\u1ed1n phi\u00ean luy\u1ec7n m\u1ea3ng \u0111ang v\u00e1 ho\u1eb7c b\u00e0i m\u1edbi theo ba b\u01b0\u1edbc \u1edf tr\u00ean;<\/li>\n<li>M\u1ed9t phi\u00ean l\u00e0m l\u1ea1i l\u1ed7i trong s\u1ed5 l\u1ed7i sai;<\/li>\n<li>M\u1ed9t phi\u00ean nh\u1eb9 h\u01a1n: \u0111\u1ecdc l\u1ea1i s\u1ed5 c\u00f4ng th\u1ee9c, t\u1ef1 \u0111\u1eb7t c\u00e2u h\u1ecfi &quot;b\u00e0i n\u00e0y \u0111\u1ed5i s\u1ed1 th\u00ec sao&quot;.<\/li>\n<\/ul>\n<p>\u0110\u1ea7u n\u0103m h\u1ecdc ch\u01b0a c\u1ea7n luy\u1ec7n \u0111\u1ec1 ho\u00e0n ch\u1ec9nh \u2014 \u0111\u1ec1 \u0111\u1ec3 d\u00e0nh cho giai \u0111o\u1ea1n sau c\u1ee7a l\u1ed9 tr\u00ecnh ba giai \u0111o\u1ea1n (n\u1ec1n t\u1ea3ng \u2013 t\u0103ng t\u1ed1c \u2013 n\u01b0\u1edbc r\u00fat) trong b\u00e0i k\u1ebf ho\u1ea1ch \u00f4n thi v\u00e0o l\u1edbp 10. Khi g\u1ea7n k\u1ef3 ki\u1ec3m tra, \u0111\u1ed5i m\u1ed9t phi\u00ean luy\u1ec7n m\u1ea3ng th\u00e0nh \u0111\u1ec1 nh\u1ecf b\u1ea5m gi\u1edd \u0111\u1ec3 t\u1eadp ph\u00e2n b\u1ed5 th\u1eddi gian.<\/p>\n<p>Gia \u0111\u00ecnh mu\u1ed1n nh\u1edd xem l\u1ea1i l\u1ecbch h\u1ecdc To\u00e1n hi\u1ec7n t\u1ea1i c\u1ee7a con \u0111ang h\u1ee3p l\u00fd hay n\u1eb7ng\u2013nh\u1eb9 ch\u01b0a \u0111\u1ec1u, nh\u1eafn <a href=\"https:\/\/zalo.me\/0987866485\">Zalo 0987866485<\/a>: g\u1eedi l\u1ecbch tu\u1ea7n c\u1ee7a con, th\u1ea7y c\u00f4 g\u00f3p \u00fd theo \u0111\u00fang m\u1ee5c ti\u00eau nh\u00e0 m\u00ecnh \u0111ang nh\u1eafm.<\/p>\n<h2>Ph\u1ee5 huynh \u0111\u1ed3ng h\u00e0nh th\u1ebf n\u00e0o \u2014 v\u00e0 khi n\u00e0o c\u1ea7n th\u00eam l\u1edbp h\u1ecdc<\/h2>\n<p>B\u1ed1 m\u1eb9 kh\u00f4ng c\u1ea7n bi\u1ebft gi\u1ea3i t\u1eebng b\u00e0i v\u1eabn gi\u00fap \u0111\u01b0\u1ee3c con h\u1ecdc To\u00e1n. Ba vi\u1ec7c d\u01b0\u1edbi \u0111\u00e2y l\u00e0m \u0111\u01b0\u1ee3c ngay:<\/p>\n<ul>\n<li><strong>\u0110\u1eebng mua th\u00eam x\u1ea5p \u0111\u1ec1.<\/strong> T\u00e0i li\u1ec7u nhi\u1ec1u kh\u00f4ng gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c m\u1ed9t m\u1ea3ng h\u1ed5ng; danh s\u00e1ch hai\u2013ba m\u1ea3ng sau b\u00e0i ch\u1ea9n \u0111o\u00e1n m\u1edbi l\u00e0 th\u1ee9 c\u1ea7n \u0111\u1ea7u ti\u00ean.<\/li>\n<li><strong>H\u1ecfi \u0111\u00fang c\u00e2u.<\/strong> Thay v\u00ec &quot;\u0111i\u1ec3m m\u1ea5y&quot;, m\u1ed7i tu\u1ea7n h\u1ecfi con &quot;tu\u1ea7n n\u00e0y con s\u1eeda \u0111\u01b0\u1ee3c l\u1ed7i g\u00ec&quot;. Con k\u1ec3 \u0111\u01b0\u1ee3c l\u00e0 \u0111ang ti\u1ebfn b\u1ed9 th\u1eadt; k\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c th\u00ec ng\u1ed3i l\u1ea1i xem s\u1ed5 l\u1ed7i sai.<\/li>\n<li><strong>Nh\u00ecn s\u1ed5 l\u1ed7i sai thay v\u00ec nh\u00ecn t\u1eebng \u0111i\u1ec3m.<\/strong> \u0110i\u1ec3m ki\u1ec3m tra nh\u1ea5p nh\u00f4 theo \u0111\u1ec1; s\u1ed1 l\u1ed7i \u0111\u01b0\u1ee3c g\u1ea1ch \u0111i m\u1ed7i tu\u1ea7n m\u1edbi l\u00e0 con s\u1ed1 bi\u1ebft ch\u1eafc con \u0111ang \u0111i l\u00ean.<\/li>\n<\/ul>\n<p>Ri\u00eang con nh\u1eafm thi chuy\u00ean To\u00e1n, ph\u1ea7n chuy\u00ean \u0111\u1ec1 (b\u00e0i to\u00e1n ch\u1ee9ng minh, b\u00e0i to\u00e1n n\u00e2ng cao theo d\u1ea1ng \u0111\u1ec1 chuy\u00ean) n\u00ean c\u00f3 th\u1ea7y c\u00f4 duy\u1ec7t l\u1ed9 tr\u00ecnh s\u1edbm \u2014 n\u0103m 2026, c\u1ea1nh tranh v\u00e0o Tr\u01b0\u1eddng THPT Chuy\u00ean Tuy\u00ean Quang l\u00e0 r\u00f5 r\u00e0ng: 933 th\u00ed sinh \u0111\u0103ng k\u00fd cho 490 ch\u1ec9 ti\u00eau (B\u00e1o Tuy\u00ean Quang, 28\/5\/2026). N\u1ebfu gia \u0111\u00ecnh c\u00e2n nh\u1eafc l\u1edbp luy\u1ec7n thi t\u1ea1i Tuy\u00ean Quang, c\u00f3 th\u1ec3 xem ch\u01b0\u01a1ng tr\u00ecnh t\u1ea1i <a href=\"https:\/\/thanhtuyen.edu.vn\/trung-tam-luyen-thi-tuyen-quang\">trang luy\u1ec7n thi v\u00e0o l\u1edbp 10 c\u1ee7a Th\u00e0nh Tuyen EDU<\/a>; c\u00f2n n\u1ebfu con m\u1edbi c\u1ea7n ch\u1ec9nh ph\u01b0\u01a1ng ph\u00e1p, c\u00e1c b\u01b0\u1edbc \u1edf tr\u00ean d\u00f9ng \u0111\u01b0\u1ee3c ngay, kh\u00f4ng c\u1ea7n \u0111\u0103ng k\u00fd g\u00ec c\u1ea3.<\/p>\n<p>Con \u0111ang k\u1eb9t \u1edf m\u1ea3ng n\u00e0o, b\u1ed1 m\u1eb9 nh\u1eafn <a href=\"https:\/\/zalo.me\/0987866485\">Zalo\/hotline 0987866485<\/a> \u2014 th\u1ea7y c\u00f4 nghe t\u00ecnh h\u00ecnh v\u00e0 ch\u1ec9 \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u ph\u00f9 h\u1ee3p tr\u01b0\u1edbc khi nh\u00e0 m\u00ecnh quy\u1ebft \u0111\u1ecbnh h\u1ecdc th\u00eam hay t\u1ef1 \u00f4n.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<p><strong>H\u1ecdc To\u00e1n l\u1edbp 9 theo c\u00e1ch n\u00e0y, bao l\u00e2u th\u00ec th\u1ea5y ti\u1ebfn b\u1ed9?<\/strong><\/p>\n<p>Hai\u2013ba tu\u1ea7n l\u00e0 th\u1ea5y qua t\u1ed1c \u0111\u1ed9 l\u00e0m b\u00e0i v\u00e0 s\u1ed1 l\u1ea7n &quot;t\u1eafc&quot; gi\u1eefa b\u00e0i. \u0110i\u1ec3m ki\u1ec3m tra c\u1ea7n m\u1ed9t\u2013hai chu k\u1ef3 m\u1edbi ph\u1ea3n \u00e1nh r\u00f5; th\u01b0\u1edbc \u0111o ch\u1eafc nh\u1ea5t l\u00e0 s\u1ed1 l\u1ed7i \u0111\u01b0\u1ee3c g\u1ea1ch m\u1ed7i tu\u1ea7n.<\/p>\n<p><strong>Con y\u1ebfu To\u00e1n t\u1eeb c\u00e1c l\u1edbp tr\u01b0\u1edbc, gi\u1edd l\u1edbp 9 c\u00f3 k\u1ecbp kh\u00f4ng?<\/strong><\/p>\n<p>K\u1ecbp, n\u1ebfu v\u00e1 \u0111\u00fang th\u1ee9 t\u1ef1: ch\u1ea9n \u0111o\u00e1n tr\u01b0\u1edbc, luy\u1ec7n l\u1ea1i n\u1ec1n h\u1ed5ng, r\u1ed3i m\u1edbi h\u1ecdc ph\u1ea7n m\u1edbi. H\u1ecdc d\u1ed3n theo b\u00e0i m\u1edbi m\u00e0 b\u1ecf n\u1ec1n c\u0169 th\u00ec l\u1ed7 h\u1ed5ng m\u1edf r\u1ed9ng, kh\u00f4ng t\u1ef1 l\u00e0nh.<\/p>\n<p><strong>C\u00f3 n\u00ean cho con luy\u1ec7n \u0111\u1ec1 To\u00e1n v\u00e0o 10 ngay t\u1eeb th\u00e1ng 10\u201311 kh\u00f4ng?<\/strong><\/p>\n<p>Ch\u01b0a. \u0110\u1ec1 \u0111\u1ec3 \u0111o ti\u1ebfn b\u1ed9 v\u00e0 l\u00e0m quen \u00e1p l\u1ef1c th\u1eddi gian, x\u1ebfp v\u1ec1 giai \u0111o\u1ea1n t\u0103ng t\u1ed1c \u2013 n\u01b0\u1edbc r\u00fat nh\u01b0 b\u00e0i k\u1ebf ho\u1ea1ch \u00f4n thi. \u0110\u1ea7u n\u0103m ch\u1ec9 c\u1ea7n n\u1ec1n v\u00e0 chuy\u00ean \u0111\u1ec1, \u0111\u1ec1 kh\u00f3 \u0111\u1ec3 sau.<\/p>\n<p><strong>To\u00e1n h\u00ecnh l\u1edbp 9 n\u00ean b\u1eaft \u0111\u1ea7u \u00f4n l\u1ea1i t\u1eeb \u0111\u00e2u?<\/strong><\/p>\n<p>T\u1eeb vi\u1ec7c v\u1ebd h\u00ecnh \u0111\u00fang theo d\u1eef ki\u1ec7n c\u1ee7a \u0111\u1ec1 v\u00e0 n\u1eafm quan h\u1ec7 trong tam gi\u00e1c. Ph\u1ea7n l\u1edbn b\u00e0i ch\u1ee9ng minh h\u00ecnh d\u1eebng \u1edf h\u00ecnh v\u1ebd sai, thi\u1ebfu d\u1eef ki\u1ec7n \u0111\u00e1nh d\u1ea5u \u2014 s\u1eeda h\u00ecnh l\u00e0 m\u1edf \u0111\u01b0\u1ee3c n\u1eeda b\u00e0i.<\/p>\n<hr>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1ch h\u1ecdc to\u00e1n gi\u1ecfi l\u1edbp 9 t\u1eeb n\u1ec1n t\u1ea3ng: b\u00e0i ch\u1ea9n \u0111o\u00e1n l\u1ed7 h\u1ed5ng, s\u1ed5 l\u1ed7i sai, tr\u00ecnh b\u00e0y l\u1eddi gi\u1ea3i \u2014 l\u1ed9 tr\u00ecnh cho h\u1ecdc sinh Tuy\u00ean Quang thi v\u00e0o 10 n\u0103m 2027.<\/p>\n","protected":false},"author":1,"featured_media":397,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[26,17],"class_list":["post-76","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-toan-van-thcs","tag-lop-9","tag-toan-lop-9"],"_links":{"self":[{"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/posts\/76","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/comments?post=76"}],"version-history":[{"count":1,"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/posts\/76\/revisions"}],"predecessor-version":[{"id":77,"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/posts\/76\/revisions\/77"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/media\/397"}],"wp:attachment":[{"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/media?parent=76"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/categories?post=76"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thanhtuyen.edu.vn\/blog\/wp-json\/wp\/v2\/tags?post=76"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}