{"id":33553,"date":"2026-09-09T15:55:38","date_gmt":"2026-09-09T08:55:38","guid":{"rendered":"https:\/\/etest.edu.vn\/?p=33553"},"modified":"2026-09-09T15:55:38","modified_gmt":"2026-09-09T08:55:38","slug":"5-loi-sai-sat-math-pho-bien-cua-hoc-sinh-viet-nam-va-cach-khac-phuc","status":"publish","type":"post","link":"https:\/\/etest.edu.vn\/en\/5-loi-sai-sat-math-pho-bien-cua-hoc-sinh-viet-nam-va-cach-khac-phuc\/","title":{"rendered":"5 L\u1ed7i Sai SAT Math Ph\u1ed5 Bi\u1ebfn C\u1ee7a H\u1ecdc Sinh Vi\u1ec7t Nam (V\u00e0 C\u00e1ch Kh\u1eafc Ph\u1ee5c)"},"content":{"rendered":"

Nhi\u1ec1u h\u1ecdc sinh Vi\u1ec7t Nam c\u00f3 n\u1ec1n t\u1ea3ng To\u00e1n h\u1ecdc kh\u00e1 v\u1eefng nh\u01b0ng v\u1eabn m\u1ea5t \u0111i\u1ec3m \u0111\u00e1ng ti\u1ebfc \u1edf ph\u1ea7n <\/span>SAT Math<\/span><\/a> \u2014 kh\u00f4ng ph\u1ea3i v\u00ec b\u00e0i to\u00e1n qu\u00e1 kh\u00f3, m\u00e0 v\u00ec r\u01a1i v\u00e0o nh\u1eefng b\u1eaby quen thu\u1ed9c c\u1ee7a Digital SAT. T\u1eeb vi\u1ec7c l\u00fang t\u00fang tr\u01b0\u1edbc c\u00e1c b\u00e0i to\u00e1n th\u1ef1c t\u1ebf d\u00e0i ch\u1ee9a nhi\u1ec1u d\u1eef ki\u1ec7n nhi\u1ec5u, \u0111\u1ecdc \u0111\u1ec1 qu\u00e1 v\u1ed9i, \u0111\u1ebfn sai s\u00f3t nh\u1ecf khi t\u00ednh d\u1ea5u hay ch\u01b0a t\u1eadn d\u1ee5ng t\u1ed1t c\u00f4ng c\u1ee5 Desmos, m\u1ed7i l\u1ed7i t\u01b0\u1edfng ch\u1eebng nh\u1ecf \u0111\u1ec1u c\u00f3 th\u1ec3 khi\u1ebfn \u0111i\u1ec3m s\u1ed1 gi\u1ea3m \u0111\u00e1ng k\u1ec3. B\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y t\u1ed5ng h\u1ee3p 5 l\u1ed7i sai SAT Math ph\u1ed5 bi\u1ebfn nh\u1ea5t c\u1ee7a h\u1ecdc sinh Vi\u1ec7t Nam, k\u00e8m v\u00ed d\u1ee5 th\u1ef1c t\u1ebf v\u00e0 c\u00e1ch kh\u1eafc ph\u1ee5c c\u1ee5 th\u1ec3 cho t\u1eebng l\u1ed7i.<\/span><\/p>\n

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5 L\u1ed7i Sai SAT Math Ph\u1ed5 Bi\u1ebfn C\u1ee7a H\u1ecdc Sinh Vi\u1ec7t Nam (V\u00e0 C\u00e1ch Kh\u1eafc Ph\u1ee5c)<\/figcaption><\/figure>\n

1. B\u00e0i to\u00e1n th\u1ef1c t\u1ebf d\u00e0i c\u00f3 nhi\u1ec1u d\u1eef ki\u1ec7n nhi\u1ec5u (Word Problems)<\/b><\/h2>\n

M\u1ed9t trong nh\u1eefng \u0111\u1eb7c tr\u01b0ng khi\u1ebfn Digital SAT Math kh\u00e1c bi\u1ec7t h\u1eb3n so v\u1edbi c\u00e1c \u0111\u1ec1 To\u00e1n trong ch\u01b0\u01a1ng tr\u00ecnh ph\u1ed5 th\u00f4ng Vi\u1ec7t Nam l\u00e0 c\u00e1ch b\u00e0i to\u00e1n \u0111\u01b0\u1ee3c “kho\u00e1c” l\u00ean m\u1ed9t b\u1ed1i c\u1ea3nh th\u1ef1c t\u1ebf d\u00e0i d\u00f2ng \u2014 c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t t\u00ecnh hu\u1ed1ng kinh t\u1ebf v\u1ec1 gi\u00e1 th\u00e0nh s\u1ea3n xu\u1ea5t. Ch\u1eb3ng h\u1ea1n, m\u1ed9t th\u00ed nghi\u1ec7m sinh h\u1ecdc theo d\u00f5i t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng c\u1ee7a qu\u1ea7n th\u1ec3 vi khu\u1ea9n, hay m\u1ed9t kh\u1ea3o s\u00e1t x\u00e3 h\u1ed9i h\u1ecdc v\u1ec1 h\u00e0nh vi ti\u00eau d\u00f9ng. \u0110i\u1ec1u \u0111\u00e1ng n\u00f3i l\u00e0 d\u00f9 c\u00e2u chuy\u1ec7n \u0111\u01b0\u1ee3c k\u1ec3 d\u00e0i \u0111\u1ebfn v\u00e0i d\u00f2ng v\u1edbi h\u00e0ng lo\u1ea1t s\u1ed1 li\u1ec7u, \u0111\u1ea1i l\u01b0\u1ee3ng v\u00e0 m\u1ed1i quan h\u1ec7. Song ph\u1ea7n l\u1edbn c\u00e1c d\u1eef ki\u1ec7n \u0111\u00f3 ch\u1ec9 \u0111\u00f3ng vai tr\u00f2 x\u00e2y d\u1ef1ng b\u1ed1i c\u1ea3nh, c\u00f2n c\u00e2u h\u1ecfi th\u1ef1c s\u1ef1 th\u01b0\u1eddng ch\u1ec9 xoay quanh m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng r\u1ea5t nh\u1ecf v\u00e0 c\u1ee5 th\u1ec3.<\/span><\/p>\n

V\u00ec sao d\u1ea1ng b\u00e0i n\u00e0y khi\u1ebfn h\u1ecdc sinh Vi\u1ec7t Nam d\u1ec5 m\u1ea5t \u0111i\u1ec3m<\/b><\/h3>\n

Quen v\u1edbi vi\u1ec7c gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y ng\u1eafn g\u1ecdn, \u0111i th\u1eb3ng v\u00e0o c\u00f4ng th\u1ee9c v\u00e0 s\u1ed1 li\u1ec7u c\u1ea7n thi\u1ebft \u1edf ch\u01b0\u01a1ng tr\u00ecnh ph\u1ed5 th\u00f4ng, nhi\u1ec1u h\u1ecdc sinh Vi\u1ec7t Nam khi g\u1eb7p m\u1ed9t \u0111o\u1ea1n v\u0103n d\u00e0i b\u1eb1ng ti\u1ebfng Anh c\u00f3 xu h\u01b0\u1edbng l\u01b0\u1edbt nhanh \u0111\u1ec3 t\u00ecm ra nh\u1eefng con s\u1ed1 xu\u1ea5t hi\u1ec7n trong b\u00e0i, r\u1ed3i l\u1eadp t\u1ee9c g\u00e1n ch\u00fang v\u00e0o m\u1ed9t c\u00f4ng th\u1ee9c quen thu\u1ed9c m\u00e0 kh\u00f4ng th\u1ef1c s\u1ef1 d\u1eebng l\u1ea1i \u0111\u1ec3 ph\u00e2n t\u00edch m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng.\u00a0<\/span><\/p>\n

C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y ti\u1ec1m \u1ea9n hai r\u1ee7i ro l\u1edbn: th\u1ee9 nh\u1ea5t l\u00e0 b\u1ecf s\u00f3t m\u1ed9t \u0111i\u1ec1u ki\u1ec7n r\u00e0ng bu\u1ed9c \u0111\u01b0\u1ee3c c\u00e0i c\u1eafm \u1edf gi\u1eefa \u0111o\u1ea1n v\u0103n \u2014 ch\u1eb3ng h\u1ea1n m\u1ed9t m\u1ed1c th\u1eddi gian b\u1eaft \u0111\u1ea7u t\u00ednh, m\u1ed9t gi\u1edbi h\u1ea1n v\u1ec1 ph\u1ea1m vi \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c, ho\u1eb7c m\u1ed9t m\u1ed1i quan h\u1ec7 t\u1ef7 l\u1ec7 ch\u1ec9 \u0111\u00fang trong m\u1ed9t kho\u1ea3ng nh\u1ea5t \u0111\u1ecbnh; th\u1ee9 hai l\u00e0 ch\u1ecdn nh\u1ea7m ch\u00ednh \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm, do nh\u1ea7m l\u1eabn gi\u1eefa c\u00e1c bi\u1ebfn s\u1ed1 \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean g\u1ea7n gi\u1ed1ng nhau ho\u1eb7c hi\u1ec3u sai vai tr\u00f2 c\u1ee7a t\u1eebng \u0111\u1ea1i l\u01b0\u1ee3ng trong b\u1ed1i c\u1ea3nh \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3. H\u1ec7 qu\u1ea3 l\u00e0 h\u1ecdc sinh v\u1eabn th\u1ef1c hi\u1ec7n \u0111\u00fang c\u00e1c ph\u00e9p t\u00ednh v\u1ec1 m\u1eb7t s\u1ed1 h\u1ecdc, nh\u01b0ng l\u1ea1i \u0111ang gi\u1ea3i quy\u1ebft m\u1ed9t b\u00e0i to\u00e1n kh\u00e1c v\u1edbi nh\u1eefng g\u00ec \u0111\u1ec1 b\u00e0i th\u1ef1c s\u1ef1 y\u00eau c\u1ea7u.<\/span><\/p>\n

C\u00e1ch kh\u1eafc ph\u1ee5c<\/b><\/h3>\n

V\u1edbi d\u1ea1ng b\u00e0i n\u00e0y, <\/span>chi\u1ebfn l\u01b0\u1ee3c<\/span><\/a> hi\u1ec7u qu\u1ea3 kh\u00f4ng n\u1eb1m \u1edf vi\u1ec7c \u0111\u1ecdc nhanh h\u01a1n, m\u00e0 \u1edf vi\u1ec7c t\u00e1ch b\u1ea1ch r\u00f5 r\u00e0ng gi\u1eefa th\u00f4ng tin n\u1ec1n (b\u1ed1i c\u1ea3nh, \u0111\u01a1n v\u1ecb \u0111o, m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng) v\u00e0 y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a c\u00e2u h\u1ecfi tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u thi\u1ebft l\u1eadp ph\u00e9p t\u00ednh. H\u1ecdc sinh n\u00ean t\u1eadp th\u00f3i quen \u0111\u1ecdc c\u00e2u h\u1ecfi \u1edf cu\u1ed1i \u0111o\u1ea1n v\u0103n tr\u01b0\u1edbc, x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm l\u00e0 g\u00ec, sau \u0111\u00f3 m\u1edbi quay l\u1ea1i \u0111\u1ecdc ph\u1ea7n b\u1ed1i c\u1ea3nh \u0111\u1ec3 ch\u1ecdn l\u1ecdc nh\u1eefng d\u1eef ki\u1ec7n th\u1ef1c s\u1ef1 li\u00ean quan \u0111\u1ebfn \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u00f3, thay v\u00ec c\u1ed1 g\u1eafng ghi nh\u1edb v\u00e0 x\u1eed l\u00fd to\u00e0n b\u1ed9 th\u00f4ng tin c\u00f9ng l\u00fac theo tr\u00ecnh t\u1ef1 \u0111\u1ec1 b\u00e0i \u0111\u01b0a ra.<\/span><\/p>\n

2. \u0110\u1ecdc \u1ea9u, gi\u1ea3i xong kh\u00f4ng tr\u1ea3 l\u1eddi \u0111\u00fang c\u00e1i \u0111\u1ec1 h\u1ecfi<\/b><\/h2>\n

M\u1ed9t trong nh\u1eefng l\u1ed7i l\u1edbn nh\u1ea5t khi l\u00e0m SAT Math l\u00e0 \u0111\u1ecdc l\u01b0\u1edbt c\u00e2u h\u1ecfi v\u00e0 b\u1ecf s\u00f3t chi ti\u1ebft quan tr\u1ecdng, d\u1eabn \u0111\u1ebfn vi\u1ec7c gi\u1ea3i \u0111\u00fang ph\u00e9p t\u00ednh nh\u01b0ng l\u1ea1i tr\u1ea3 l\u1eddi sai th\u1ee9 \u0111\u1ec1 b\u00e0i th\u1ef1c s\u1ef1 y\u00eau c\u1ea7u.<\/span><\/p>\n

D\u1ea1ng b\u1eaby “gi\u1ea3i xong qu\u00ean \u0111\u1ecdc l\u1ea1i \u0111\u1ec1”<\/b><\/h3>\n

\u0110\u00e2y l\u00e0 d\u1ea1ng b\u1eaby kinh \u0111i\u1ec3n th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “solve for x nh\u01b0ng \u0111\u1ec1 h\u1ecfi c\u00e1i kh\u00e1c”. V\u00ed d\u1ee5: \u0111\u1ec1 cho ph\u01b0\u01a1ng tr\u00ecnh d\u1eabn \u0111\u1ebfn x = 3 nh\u01b0ng c\u00e2u h\u1ecfi th\u1ef1c ch\u1ea5t y\u00eau c\u1ea7u t\u00ednh gi\u00e1 tr\u1ecb c\u1ee7a m\u1ed9t bi\u1ec3u th\u1ee9c kh\u00e1c ch\u1ee9a x (ch\u1eb3ng h\u1ea1n 9x + 1). Kh\u00f4ng \u00edt b\u1ea1n gi\u1ea3i ra x = 3 r\u1ed3i ch\u1ecdn lu\u00f4n \u0111\u00e1p \u00e1n “3”, trong khi \u0111\u00e1p \u00e1n \u0111\u00fang ph\u1ea3i l\u00e0 28.<\/span><\/p>\n

V\u00ec sao l\u1ed7i n\u00e0y \u1ea3nh h\u01b0\u1edfng l\u1edbn \u0111\u1ebfn \u0111i\u1ec3m s\u1ed1<\/b><\/h3>\n

\u0110i\u1ec3m SAT Math<\/span><\/a> th\u01b0\u1eddng kh\u00f4ng b\u1ecb k\u00e9o xu\u1ed1ng b\u1edfi m\u1ed9t l\u1ed7i l\u1edbn duy nh\u1ea5t, m\u00e0 b\u1edfi nhi\u1ec1u l\u1ed7i nh\u1ecf l\u1eb7p \u0111i l\u1eb7p l\u1ea1i do \u0111\u1ecdc \u0111\u1ec1 qu\u00e1 v\u1ed9i, b\u1ecf s\u00f3t \u0111i\u1ec1u ki\u1ec7n ho\u1eb7c hi\u1ec3u sai y\u00eau c\u1ea7u c\u1ee7a c\u00e2u h\u1ecfi.<\/span><\/p>\n

3. L\u1ed7i d\u1ea5u, ph\u00e2n ph\u1ed1i v\u00e0 t\u00ednh nh\u1ea9m<\/b><\/h2>\n

\u0110\u00e2y l\u00e0 nh\u00f3m l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t, th\u01b0\u1eddng g\u1eb7p \u1edf c\u1ea3 nh\u1eefng h\u1ecdc sinh c\u00f3 n\u1ec1n t\u1ea3ng To\u00e1n kh\u00e1 t\u1ed1t, v\u00ec b\u1ea3n ch\u1ea5t b\u00e0i to\u00e1n kh\u00f4ng kh\u00f3 nh\u01b0ng l\u1ea1i sai \u1edf b\u01b0\u1edbc t\u00ednh to\u00e1n trung gian.<\/span><\/p>\n

C\u00e1c l\u1ed7i c\u1ee5 th\u1ec3 th\u01b0\u1eddng g\u1eb7p<\/b><\/h3>\n