{"id":8798,"date":"2026-04-18T21:12:55","date_gmt":"2026-04-18T14:12:55","guid":{"rendered":"https:\/\/doisongmoi.com.vn\/?p=8798"},"modified":"2026-04-18T21:13:44","modified_gmt":"2026-04-18T14:13:44","slug":"8798","status":"publish","type":"post","link":"https:\/\/doisongmoi.com.vn\/?p=8798","title":{"rendered":"H\u1ecdc sinh l\u1edbp 3 l\u00e0m to\u00e1n (3 + 3) x 2 = 12 b\u1ecb c\u00f4 g\u1ea1ch sai, m\u1eb9 l\u00ean m\u1ea1ng th\u1eafc m\u1eafc l\u00e0m b\u00f9ng n\u1ed5 tr;anh c\u00e3i"},"content":{"rendered":"

M\u1ed7i ph\u1ee5 huynh \u0111\u01b0a ra m\u1ed9t \u00fd ki\u1ebfn kh\u00e1c nhau, \u00fd ki\u1ebfn n\u00e0o c\u0169ng c\u00f3 s\u1ef1 \u0111\u1ed3ng t\u00ecnh t\u1eeb m\u1ecdi ng\u01b0\u1eddi.<\/h2>\n

Chuy\u00ean trang Ph\u1ee5 n\u1eef & Ph\u00e1p lu\u1eadt ng\u00e0y 18\/4\/2026 \u0111\u0103ng tin: “H\u1ecdc sinh l\u1edbp 3 l\u00e0m to\u00e1n (3 + 3) x 2 = 12 b\u1ecb c\u00f4 g\u1ea1ch sai, m\u1eb9 l\u00ean m\u1ea1ng th\u1eafc m\u1eafc l\u00e0m b\u00f9ng n\u1ed5 tranh c\u00e3i”, n\u1ed9i dung nh\u01b0 sau:\u00a0<\/strong><\/p>\n

To\u00e1n h\u1ecdc kh\u00f4ng ch\u1ec9 c\u1ea7n ra k\u1ebft qu\u1ea3 \u0111\u00fang m\u00e0 c\u00f2n \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00ednh x\u00e1c trong t\u1eebng b\u01b0\u1edbc l\u00e0m, t\u1eeb c\u00e1ch \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c \u0111\u1ebfn l\u1eadp lu\u1eadn gi\u1ea3i b\u00e0i. V\u00ec v\u1eady, vi\u1ec7c h\u1ecdc sinh l\u00e0m \u0111\u00fang theo nh\u1eefng g\u00ec \u0111\u01b0\u1ee3c c\u00f4 gi\u00e1o h\u01b0\u1edbng d\u1eabn l\u00e0 \u0111i\u1ec1u r\u1ea5t quan tr\u1ecdng, gi\u00fap c\u00e1c em h\u00ecnh th\u00e0nh n\u1ec1n t\u1ea3ng t\u01b0 duy logic v\u00e0 ch\u1eb7t ch\u1ebd ngay t\u1eeb nh\u1ecf.<\/p>\n

M\u1edbi \u0111\u00e2y, tr\u00ean m\u1ed9t di\u1ec5n \u0111\u00e0n d\u00e0nh cho c\u00e1c b\u1eadc cha m\u1eb9 Vi\u1ec7t c\u00f3 con em \u0111ang h\u1ecdc ti\u1ec3u h\u1ecdc, m\u1ed9t ph\u1ee5 huynh (gi\u1ea5u t\u00ean) chia s\u1ebb b\u00e0i t\u1eadp l\u00e0m to\u00e1n c\u1ee7a con \u0111ang h\u1ecdc l\u1edbp 3 v\u1edbi l\u1eddi l\u1ebd \u0111\u1ea7y s\u1ef1 t\u1ee9c gi\u1eadn. Cha m\u1eb9 n\u00e0y xin \u00fd ki\u1ebfn c\u1ee7a m\u1ecdi ng\u01b0\u1eddi v\u00ec cho r\u1eb1ng c\u00f4 gi\u00e1o \u0111ang qu\u00e1 m\u00e1y m\u00f3c khi ch\u1ea5m b\u00e0i to\u00e1n c\u1ee7a h\u1ecdc sinh, \u0111i\u1ec1u n\u00e0y d\u1ec5 l\u00e0m m\u1ea5t \u0111i s\u1ef1 s\u00e1ng t\u1ea1o trong t\u01b0 duy c\u1ee7a tr\u1ebb.<\/p>\n

“Cho \u00fd ki\u1ebfn \u0111i c\u00e1c ph\u1ee5 huynh. L\u1edbp 3 \u1ea1. Em th\u00ec ngh\u0129, m\u00e1y m\u00f3c v\u1eady kh\u00e1c n\u00e0o d\u1eadp t\u1eaft h\u1ebft s\u1ef1 s\u00e1ng t\u1ea1o c\u1ee7a tr\u1ebb. Tr\u1ebb t\u01b0 duy b\u1ea3n ch\u1ea5t \u0111\u00fang, ra k\u1ebft qu\u1ea3 \u0111\u00fang l\u00e0 ok”\u00a0<\/em>– ng\u01b0\u1eddi n\u00e0y n\u00f3i.<\/p>\n

K\u00e8m theo \u0111\u00f3 l\u00e0 \u1ea3nh ch\u1ee5p b\u00e0i to\u00e1n.<\/p>\n

\"H\u1ecdc<\/strong><\/p>\n

B\u00e0i to\u00e1n \u0111\u01b0a ra:\u00a0Bi\u1ebft di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng l\u00e0 9 x\u0103ng- ti – m\u00e9t vu\u00f4ng. T\u00ednh chu vi c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u00f3.<\/em><\/p>\n

Em h\u1ecdc sinh \u0111\u00e3 tri\u1ec3n khai b\u00e0i to\u00e1n (nh\u01b0 trong \u1ea3nh) nh\u01b0ng \u0111\u00e3 b\u1ecb c\u00f4 gi\u00e1o g\u1ea1ch sai k\u1ebft qu\u1ea3. Ng\u01b0\u1eddi m\u1eb9 cho r\u1eb1ng con m\u00ecnh kh\u00f4ng sai, t\u01b0 duy \u0111\u00fang v\u00e0 s\u00e1ng t\u1ea1o v\u00ec v\u1eabn cho k\u1ebft qu\u1ea3 \u0111\u00fang nh\u01b0ng c\u00f4 gi\u00e1o ch\u1ea5m nh\u01b0 th\u1ebf \u0111\u00e3 khi\u1ebfn b\u00e0i to\u00e1n kh\u00f4ng \u0111\u01b0\u1ee3c \u0111i\u1ec3m n\u00ean t\u1ee9c gi\u1eadn \u0111i h\u1ecfi \u00fd ki\u1ebfn c\u00e1c ph\u1ee5 huynh kh\u00e1c.<\/p>\n

Nhi\u1ec1u\u00a0b\u1eadc ph\u1ee5 huynh c\u00f3 m\u1eb7t tr\u00ean di\u1ec5n \u0111\u00e0n \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn\u00a0\u0111\u1ee9ng v\u1ec1 ph\u00eda c\u00f4 gi\u00e1o, cho r\u1eb1ng em h\u1ecdc sinh \u0111\u00e3 hi\u1ec3u sai, l\u00e0m sai b\u00e0i to\u00e1n. Th\u1eadm ch\u00ed c\u00f2n th\u1eb3ng th\u1eafn cho r\u1eb1ng c\u00e1ch ng\u01b0\u1eddi m\u1eb9 b\u1ea3o v\u1ec7 con m\u00ecnh c\u0169ng ho\u00e0n to\u00e0n sai v\u00ec to\u00e1n h\u1ecdc c\u00f3 c\u00f4ng th\u1ee9c r\u00f5 r\u00e0ng v\u00e0 kh\u00f4ng th\u1ec3 s\u00e1ng t\u1ea1o nh\u01b0 th\u1ebf \u0111\u01b0\u1ee3c.<\/p>\n

Theo \u0111\u00f3, b\u00e0i to\u00e1n \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ee5 huynh cho r\u1eb1ng ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u00fang nh\u01b0 sau:<\/p>\n

“T\u1eeb d\u1eef ki\u1ec7n b\u00e0i ra ta c\u00f3 S h\u00ecnh vu\u00f4ng = 9<\/em><\/p>\n

M\u00e0 S h\u00ecnh vu\u00f4ng = c\u1ea1nh x c\u1ea1nh. Suy ra \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh h\u00ecnh vu\u00f4ng t\u01b0\u01a1ng \u1ee9ng s\u1ebd l\u00e0 9 = 3×3. V\u1eady ta c\u00f3 c\u1ea1nh h\u00ecnh vu\u00f4ng l\u00e0 3 cm.<\/em><\/p>\n

Chu vi h\u00ecnh vu\u00f4ng s\u1ebd l\u00e0:<\/em><\/p>\n

3 x 4 =12 (cm)<\/em><\/p>\n

\u0110\u00e1p s\u1ed1: Chu vi h\u00ecnh vu\u00f4ng: 12 cm”<\/em><\/p>\n

R\u1ea5t nhi\u1ec1u ph\u1ee5 huynh \u0111\u00e3 \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn nh\u1eadn x\u00e9t:<\/p>\n

– Sai c\u00f4ng th\u1ee9c l\u00e0 sai. To\u00e1n ph\u1ea3i \u0111\u00fang c\u00f4ng th\u1ee9c, b\u1ed1 m\u1eb9 nh\u00e9. S\u00e1ng t\u1ea1o kh\u00f4ng \u0111\u00fang trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, nh\u1ea5t l\u00e0 m\u00f4n To\u00e1n.<\/em><\/p>\n

– Chu vi h\u00ecnh vu\u00f4ng = c\u1ea1nh \u00d7 4 th\u00ec c\u1ee9 th\u1ebf m\u00e0 l\u00e0m. \u0110\u00e3 n\u00eau r\u00f5 l\u00e0 h\u00ecnh vu\u00f4ng th\u00ec ph\u1ea3i l\u00e0m theo c\u00f4ng th\u1ee9c h\u00ecnh vu\u00f4ng ch\u1ee9.<\/em><\/p>\n

– C\u00f4 gi\u00e1o ch\u1ea5m nh\u01b0 v\u1eady l\u00e0 \u0111\u00fang r\u1ed3i, m\u00ecnh th\u1ea5y nh\u01b0 th\u1ebf l\u00e0 c\u00f2n nh\u00e2n nh\u01b0\u1ee3ng.<\/em><\/p>\n

\"H\u1ecdc<\/p>\n

Tuy nhi\u00ean, c\u0169ng c\u00f3 ng\u01b0\u1eddi cho r\u1eb1ng c\u00e1ch ch\u1ea5m c\u1ee7a c\u00f4 gi\u00e1o sai ngay t\u1eeb \u0111\u1ea7u n\u00ean c\u00f3 th\u1ec3 g\u00e2y b\u1ee9c x\u00fac cho ph\u1ee5 huynh.<\/p>\n

–\u00a0\u0110i\u1ec1u em quan t\u00e2m l\u1ea1i kh\u00f4ng ph\u1ea3i c\u00f4 gi\u00e1o ch\u1ea5m ph\u00e9p t\u00ednh sai, m\u00e0 l\u00e0 ph\u00e9p t\u00ednh ngay t\u1eeb \u0111\u1ea7u \u0111\u00e3 sai b\u1ea3n ch\u1ea5t ho\u00e0n to\u00e0n th\u00ec c\u00f4 gi\u00e1o l\u1ea1i ch\u1ea5m \u0111\u00fang. Ph\u00e9p t\u00ednh d\u01b0\u1edbi t\u00ednh chu vi th\u00ec th\u1eadt ra con kh\u00f4ng sai, ph\u00e9p t\u00ednh \u0111\u00f3 ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c. N\u1ebfu c\u00f3 tr\u1eeb th\u00ec ch\u1ec9 n\u00ean tr\u1eeb m\u1ed9t ch\u00fat \u0111i\u1ec3m \u0111\u1ec3 nh\u1eafc con l\u00e0m \u0111\u00fang c\u00f4ng th\u1ee9c, \u0111\u1ec3 sau n\u00e0y t\u00ednh ng\u01b0\u1ee3c l\u1ea1i con d\u1ec5 t\u00ednh to\u00e1n h\u01a1n.<\/em><\/p>\n

– C\u00e1i n\u00e0y m\u1eb9 th\u1eafc m\u1eafc kh\u00f4ng sai. \u0110i\u1ec1u em b\u0103n kho\u0103n th\u1ef1c s\u1ef1 l\u00e0 ph\u00e9p t\u00ednh \u0111\u1ea7u sai b\u1ea3n ch\u1ea5t m\u00e0 c\u00f4 v\u1eabn ch\u1ea5m \u0111\u00fang.<\/em><\/p>\n

– Ph\u00e9p t\u00ednh \u0111\u00f3 \u0111\u00fang ph\u1ea3i l\u00e0: ta th\u1ea5y 9 = 3 \u00d7 3, n\u00ean \u0111\u1ed9 d\u00e0i c\u1ea1nh h\u00ecnh vu\u00f4ng l\u00e0 3 cm.<\/em><\/p>\n

– B\u1ea3n ch\u1ea5t chu vi h\u00ecnh l\u00e0 t\u1ed5ng 4 c\u1ea1nh. H\u00ecnh ch\u1eef nh\u1eadt l\u00e0 (d\u00e0i + r\u1ed9ng) \u00d7 2 v\u00ec c\u00f3 2 c\u1eb7p c\u1ea1nh b\u1eb1ng nhau. C\u00f2n h\u00ecnh vu\u00f4ng v\u00ec 4 c\u1ea1nh b\u1eb1ng nhau n\u00ean m\u1edbi th\u00e0nh c\u1ea1nh \u00d7 4, b\u1ea3n ch\u1ea5t l\u00e0 nh\u01b0 v\u1eady. B\u00e9 l\u00e0m c\u0169ng kh\u00f4ng sai, nh\u01b0ng c\u00f3 th\u1ec3 b\u00e9 ch\u01b0a hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t. V\u00e0 c\u0169ng c\u00f3 th\u1ec3 m\u1ed9t s\u1ed1 b\u1eadc ph\u1ee5 huynh \u1edf \u0111\u00e2y ch\u01b0a hi\u1ec3u r\u00f5 \u0111i\u1ec1u n\u00e0y.<\/em><\/p>\n

– M\u00ecnh l\u00e0 gi\u00e1o vi\u00ean. C\u00f4 gi\u00e1o ch\u1ea5m sai. B\u01b0\u1edbc 1 ph\u1ea3i ph\u00e2n t\u00edch 9 = 3 \u00d7 3 r\u1ed3i m\u1edbi suy ra, vi\u1ebft nh\u01b0 kia l\u00e0 sai. C\u00f2n b\u01b0\u1edbc 2 h\u1ecdc sinh l\u00e0m v\u1eabn \u0111\u00fang, v\u00ec b\u1ea3n ch\u1ea5t chu vi l\u00e0 t\u1ed5ng \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh. Nhi\u1ec1u gi\u00e1o vi\u00ean ti\u1ec3u h\u1ecdc tr\u00ecnh \u0111\u1ed9 c\u00f2n h\u1ea1n ch\u1ebf.<\/em><\/p>\n

\"H\u1ecdc<\/p>\n

Qua c\u00e2u chuy\u1ec7n tr\u00ean, c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng trong m\u00f4n To\u00e1n, s\u1ef1 ch\u00ednh x\u00e1c kh\u00f4ng ch\u1ec9 n\u1eb1m \u1edf \u0111\u00e1p s\u1ed1 cu\u1ed1i c\u00f9ng m\u00e0 c\u00f2n th\u1ec3 hi\u1ec7n \u1edf to\u00e0n b\u1ed9 qu\u00e1 tr\u00ecnh l\u00e0m b\u00e0i. M\u1ed7i b\u01b0\u1edbc bi\u1ebfn \u0111\u1ed5i, m\u1ed7i c\u00f4ng th\u1ee9c \u00e1p d\u1ee5ng \u0111\u1ec1u c\u1ea7n \u0111\u00fang b\u1ea3n ch\u1ea5t th\u00ec m\u1edbi \u0111\u1ea3m b\u1ea3o h\u1ecdc sinh hi\u1ec3u b\u00e0i m\u1ed9t c\u00e1ch \u0111\u1ea7y \u0111\u1ee7 v\u00e0 b\u1ec1n v\u1eefng. N\u1ebfu ch\u1ec9 ch\u00fa tr\u1ecdng k\u1ebft qu\u1ea3 m\u00e0 b\u1ecf qua c\u00e1ch l\u00e0m, tr\u1ebb r\u1ea5t d\u1ec5 h\u00ecnh th\u00e0nh th\u00f3i quen suy lu\u1eadn c\u1ea3m t\u00ednh, thi\u1ebfu ch\u1eb7t ch\u1ebd.<\/p>\n

B\u00ean c\u1ea1nh \u0111\u00f3, ph\u1ee5 huynh c\u0169ng \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ed3ng h\u00e0nh c\u00f9ng con. Thay v\u00ec ch\u1ec9 nh\u00ecn v\u00e0o vi\u1ec7c \u0111\u00fang hay sai \u0111\u1ec3 b\u00eanh v\u1ef1c ho\u1eb7c tr\u00e1ch m\u00f3c, cha m\u1eb9 n\u00ean nh\u1eafc nh\u1edf con th\u1ef1c hi\u1ec7n \u0111\u00fang theo ph\u01b0\u01a1ng ph\u00e1p m\u00e0 gi\u00e1o vi\u00ean \u0111\u00e3 gi\u1ea3ng d\u1ea1y. \u0110i\u1ec1u n\u00e0y kh\u00f4ng l\u00e0m m\u1ea5t \u0111i s\u1ef1 s\u00e1ng t\u1ea1o, m\u00e0 ng\u01b0\u1ee3c l\u1ea1i c\u00f2n gi\u00fap tr\u1ebb s\u00e1ng t\u1ea1o tr\u00ean n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c \u0111\u00fang \u0111\u1eafn v\u00e0 v\u1eefng ch\u1eafc.<\/p>\n

Ngo\u00e0i ra, m\u1ed7i b\u00e0i to\u00e1n \u1edf b\u1eadc ti\u1ec3u h\u1ecdc kh\u00f4ng ch\u1ec9 nh\u1eb1m t\u00ecm ra \u0111\u00e1p \u00e1n m\u00e0 c\u00f2n gi\u00fap h\u1ecdc sinh r\u00e8n luy\u1ec7n t\u01b0 duy theo quy tr\u00ecnh: hi\u1ec3u \u0111\u1ec1, ph\u00e2n t\u00edch, \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c v\u00e0 tr\u00ecnh b\u00e0y. Khi con l\u00e0m \u0111\u00fang quy tr\u00ecnh n\u00e0y, vi\u1ec7c h\u1ecdc To\u00e1n s\u1ebd tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n \u1edf c\u00e1c l\u1edbp tr\u00ean, tr\u00e1nh \u0111\u01b0\u1ee3c nh\u1eefng sai s\u00f3t mang t\u00ednh h\u1ec7 th\u1ed1ng.<\/p>\n

\u0110\u1eb7c bi\u1ec7t, trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p ph\u1ee5 huynh c\u00f2n b\u0103n kho\u0103n v\u1ec1 c\u00e1ch ch\u1ea5m b\u00e0i ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y, vi\u1ec7c trao \u0111\u1ed5i tr\u1ef1c ti\u1ebfp v\u1edbi gi\u00e1o vi\u00ean l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft. S\u1ef1 trao \u0111\u1ed5i th\u1eb3ng th\u1eafn, t\u00f4n tr\u1ecdng s\u1ebd gi\u00fap hai b\u00ean hi\u1ec3u nhau h\u01a1n, t\u1eeb \u0111\u00f3 c\u00f3 c\u00e1ch h\u1ed7 tr\u1ee3 h\u1ecdc sinh t\u1ed1t nh\u1ea5t, thay v\u00ec tranh lu\u1eadn theo c\u1ea3m t\u00ednh.<\/p>\n

Cu\u1ed1i c\u00f9ng, gi\u00e1o d\u1ee5c l\u00e0 s\u1ef1 ph\u1ed1i h\u1ee3p gi\u1eefa gia \u0111\u00ecnh v\u00e0 nh\u00e0 tr\u01b0\u1eddng. Khi ph\u1ee5 huynh v\u00e0 gi\u00e1o vi\u00ean c\u00f9ng th\u1ed1ng nh\u1ea5t trong c\u00e1ch d\u1ea1y v\u00e0 c\u00e1ch h\u1ecdc, tr\u1ebb s\u1ebd c\u00f3 m\u00f4i tr\u01b0\u1eddng ph\u00e1t tri\u1ec3n \u1ed5n \u0111\u1ecbnh, v\u1eeba n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c, v\u1eeba r\u00e8n luy\u1ec7n \u0111\u01b0\u1ee3c t\u00ednh c\u1ea9n th\u1eadn, ch\u00ednh x\u00e1c \u2013 nh\u1eefng y\u1ebfu t\u1ed1 r\u1ea5t quan tr\u1ecdng kh\u00f4ng ch\u1ec9 trong To\u00e1n h\u1ecdc m\u00e0 c\u00f2n trong cu\u1ed9c s\u1ed1ng sau n\u00e0y.<\/p>\n

Tr\u01b0\u1edbc \u0111\u00f3, b\u00e1o D\u00e2n Vi\u1ec7t ng\u00e0y 5\/12\/2022 t\u1eebng \u0111\u01b0a tin v\u1ec1 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p t\u01b0\u01a1ng t\u1ef1 trong b\u00e0i \u0111\u0103ng: “H\u1ecdc sinh l\u1edbp 3 l\u00e0m To\u00e1n \u0111\u00fang k\u1ebft qu\u1ea3 nh\u01b0ng b\u1ecb gi\u00e1o vi\u00ean g\u1ea1ch sai g\u00e2y tranh c\u00e3i”, n\u1ed9i dung cho bi\u1ebft:\u00a0<\/strong><\/p>\n

M\u1ed9t ph\u1ee5 huynh \u1edf B\u00ecnh D\u01b0\u01a1ng ki\u1ec3m tra b\u00e0i t\u1eadp \u1edf l\u1edbp c\u1ee7a con \u0111\u00e3 b\u1ea5t ng\u1edd khi nh\u00ecn th\u1ea5y b\u00e0i To\u00e1n r\u00f5 r\u00e0ng l\u00e0m \u0111\u00fang k\u1ebft qu\u1ea3 nh\u01b0ng l\u1ea1i b\u1ecb gi\u00e1o vi\u00ean g\u1ea1ch sai r\u1ea5t kh\u00f3 hi\u1ec3u.<\/p>\n

C\u1ee5 th\u1ec3 \u0111\u1ec1 b\u00e0i nh\u01b0 sau: “H\u00e0ng ng\u00e0y, c\u00f4 Ba l\u00e1i \u0111\u00f2 ch\u1edf c\u00e1c b\u1ea1n qua s\u00f4ng \u0111i h\u1ecdc. S\u00e1ng nay c\u00f4 Ba ch\u1edf 6 chuy\u1ebfn \u0111\u00f2, m\u1ed7i chuy\u1ebfn c\u00f3 4 b\u1ea1n. H\u1ecfi s\u00e1ng nay c\u00f4 Ba ch\u1edf bao nhi\u00eau b\u1ea1n qua s\u00f4ng?”.<\/p>\n

H\u1ecdc sinh \u0111\u01b0a ra \u0111\u00e1p \u00e1n: “S\u00e1ng nay c\u00f4 Ba ch\u1edf s\u1ed1 b\u1ea1n nh\u1ecf qua s\u00f4ng l\u00e0: 6 x 4 = 24 (b\u1ea1n nh\u1ecf)”.<\/p>\n

Tuy nhi\u00ean c\u00e2u tr\u1ea3 l\u1eddi n\u00e0y b\u1ecb \u0111\u00e1nh d\u1ea5u sai khi\u1ebfn ph\u1ee5 huynh kh\u00f4ng kh\u1ecfi hoang mang. Nhi\u1ec1u c\u01b0 d\u00e2n m\u1ea1ng c\u0169ng t\u1ecf ra kh\u00f3 hi\u1ec3u, kh\u1eb3ng \u0111\u1ecbnh c\u00f4 gi\u00e1o \u0111\u00e3 nh\u1ea7m l\u1eabn v\u00ec k\u1ebft qu\u1ea3 n\u00e0y l\u00e0 \u0111\u00fang.<\/p>\n

\"H\u1ecdc
<\/figcaption><\/figure>\n

Sau \u0111\u00f3, ph\u1ee5 huynh n\u00e0y c\u0169ng \u0111\u00e3 c\u00f3 cu\u1ed9c trao \u0111\u1ed5i ri\u00eang v\u1edbi gi\u00e1o vi\u00ean t\u1ea1i tr\u01b0\u1eddng \u0111\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch r\u00f5 v\u1ea5n \u0111\u1ec1. C\u00f4 gi\u00e1o gi\u1ea3i th\u00edch, \u0111\u00e1p s\u1ed1 \u0111\u00fang l\u00e0 24 b\u1ea1n nh\u1ecf. Tuy nhi\u00ean, b\u00e0i to\u00e1n h\u1ecfi s\u1ed1 b\u1ea1n nh\u1ecf n\u00ean ph\u1ea3i l\u1ea5y s\u1ed1 b\u1ea1n nh\u1ecf x s\u1ed1 chuy\u1ebfn \u0111\u00f2.<\/p>\n

Ph\u00e9p t\u00ednh \u0111\u00fang ph\u1ea3i l\u00e0m l\u00e0 4 x 6 = 24 ch\u1ee9 kh\u00f4ng ph\u1ea3i 6 x 4 = 24. Nh\u01b0 v\u1eady, b\u00e0i gi\u1ea3i c\u1ee7a em h\u1ecdc sinh trong h\u00ecnh l\u00e0m ra 24 l\u00e0 k\u1ebft qu\u1ea3 \u0111\u00fang nh\u01b0ng b\u1ea3n ch\u1ea5t v\u00e0 c\u00e1ch l\u00e0m sai n\u00ean b\u1ecb ch\u1ea5m sai.<\/p>\n

D\u00f9 v\u1eady, \u1edf g\u00f3c \u0111\u1ed9 kh\u00e1c, chia s\u1ebb v\u1edbi PV b\u00e1o\u00a0D\u00e2n Vi\u1ec7t<\/strong>, Th.S Nguy\u1ec5n Th\u1ecb Hi\u1ec1n, c\u1ef1u gi\u1ea3ng vi\u00ean Tr\u01b0\u1eddng \u0110\u1ea1i h\u1ecdc M\u1ecf – \u0110\u1ecba ch\u1ea5t, H\u00e0 N\u1ed9i cho hay: “B\u1ea3n ch\u1ea5t b\u00e0i To\u00e1n \u0111\u01b0a ra \u1edf c\u1ea5p \u0111\u1ed9 V\u1eadn d\u1ee5ng, v\u1eady n\u00ean em h\u1ecdc sinh \u0111\u00f3 ch\u1ec9 \u0111\u01b0a ra ph\u00e9p t\u00ednh 6 x 4 = 24 b\u1ea1n. X\u00e9t v\u1ec1 g\u00f3c \u0111\u1ed9 v\u1eadn d\u1ee5ng c\u1ee7a m\u1ed9t h\u1ecdc sinh l\u1edbp 3 ch\u01b0a h\u1ecdc t\u00ednh ch\u1ea5t giao ho\u00e1n th\u00ec \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ef1 s\u00e1ng t\u1ea1o, r\u1ea5t \u0111\u00e1ng \u0111\u1ec3 ch\u00fang ta tr\u00e2n tr\u1ecdng.<\/p>\n

H\u1ecdc To\u00e1n l\u00e0 \u0111\u1ec3 v\u1eadn d\u1ee5ng v\u00e0o th\u1ef1c t\u1ebf \u0111\u1eddi s\u1ed1ng c\u1ee7a m\u1ed7i ng\u01b0\u1eddi. C\u00f3 bao nhi\u00eau % h\u1ecdc sinh nh\u1edb b\u1ea3n ch\u1ea5t 4+4+4+4+4+4 = 4 x 6 ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 6 x 4? V\u00e0 ch\u1ec9 sau 1 th\u1eddi gian r\u1ea5t ng\u1eafn th\u00ec ai c\u0169ng bi\u1ebft 4 x 6 = 6 x 4. \u0110\u00e2y m\u1edbi l\u00e0 \u0111i\u1ec1u \u0111\u1ecdng l\u1ea1i cho h\u1ecdc sinh v\u00e0 gi\u00e1o vi\u00ean ph\u1ea3i d\u1ea1y cho h\u1ecdc sinh.<\/p>\n

\u0110\u1ed5i m\u1edbi ch\u01b0\u01a1ng tr\u00ecnh GDPT 2018 nh\u1ea5n m\u1ea1nh m\u1ee5c ti\u00eau “h\u1ecdc \u0111\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c g\u00ec”, v\u1eady em h\u1ecdc sinh bi\u1ebft v\u1eadn d\u1ee5ng sau khi h\u1ecdc xong ph\u00e9p nh\u00e2n v\u00e0 t\u00ednh \u0111\u00fang s\u1ed1 ng\u01b0\u1eddi m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd, ch\u00ednh x\u00e1c th\u00ec ch\u00fang ta c\u1ea7n tuy\u00ean d\u01b0\u01a1ng. B\u1ea1n ngh\u0129 sao khi \u0111\u00f2i h\u1ecfi \u1edf m\u1ed9t \u0111\u1ee9a tr\u1ebb l\u1edbp 3 ph\u1ea3i ghi nh\u1edb “B\u1ea3n ch\u1ea5t c\u1ee7a ph\u00e9p nh\u00e2n”? B\u1ea1n ngh\u0129 sao khi ch\u1ec9 c\u1ea7n \u0111\u1ebfn l\u1edbp 4 th\u00ec ch\u1eb3ng c\u1ea7n nh\u1edb “b\u1ea3n ch\u1ea5t” \u0111\u00f3 n\u1eefa m\u00e0 v\u1eabn v\u1eadn d\u1ee5ng ch\u00ednh x\u00e1c v\u00e0o cu\u1ed9c s\u1ed1ng c\u1ee7a ch\u00fang ta?<\/p>\n

T\u00f3m l\u1ea1i, trong ho\u00e0n c\u1ea3nh \u0111\u1ec1 b\u00e0i \u0111\u01b0a ra l\u00e0 m\u1ed9t b\u00e0i To\u00e1n v\u1eadn d\u1ee5ng th\u1ef1c t\u1ebf (sau khi \u0111\u00e3 h\u1ecdc xong ph\u00e9p nh\u00e2n) th\u00ec b\u00e0i l\u00e0m c\u1ee7a h\u1ecdc sinh l\u00e0 \u0111\u00fang”.<\/p>\n

B\u00ean c\u1ea1nh \u0111\u00f3, theo Th.S Nguy\u1ec5n Th\u1ecb Hi\u1ec1n: “L\u00e0 ph\u1ee5 huynh h\u1ecdc sinh, n\u1ebfu con b\u1ecb \u0111i\u1ec3m th\u1ea5p th\u00ec ba m\u1eb9 n\u00ean t\u00ecm hi\u1ec3u l\u00fd do v\u00ec sao v\u00e0 xem con th\u1ef1c s\u1ef1 sai \u1edf \u0111\u00e2u. Nhi\u1ec1u khi c\u00e1c con \u0111\u00e3 r\u1ea5t c\u1ed1 g\u1eafng nh\u01b0ng v\u00ec sai s\u00f3t nh\u1ecf n\u00e0o \u0111\u00f3 m\u00e0 d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 ch\u01b0a \u0111\u01b0\u1ee3c nh\u01b0 \u00fd. C\u00f3 r\u1ea5t nhi\u1ec1u b\u00e9 c\u00f3 t\u00e2m s\u1ef1 v\u1edbi t\u00f4i l\u00e0 con \u0111\u00e3 r\u1ea5t n\u1ed7 l\u1ef1c nh\u01b0ng con t\u00ednh nh\u1ea7m, con s\u1ee3 m\u1eb9 m\u1eafng con l\u1eafm. V\u1eady n\u00ean t\u00f4i ngh\u0129 r\u1eb1ng c\u0169ng ba m\u1eb9 n\u00ean t\u00e2m s\u1ef1 v\u1edbi con \u0111\u1ec3 hi\u1ec3u con h\u01a1n c\u0169ng nh\u01b0 c\u00f3 g\u00f3c nh\u00ecn \u0111a chi\u1ec1u \u0111\u1ec3 hi\u1ec3u s\u1ef1 vi\u1ec7c. Con \u0111\u00e3 c\u1ed1 g\u1eafng n\u1ed7 l\u1ef1c th\u00ec c\u1ea7n ghi nh\u1eadn \u0111i\u1ec1u \u0111\u00f3 v\u00e0 c\u00e1c con s\u1ebd c\u00e0ng c\u00f3 \u0111\u1ed9ng l\u1ef1c c\u1ed1 g\u1eafng.<\/p>\n

H\u1ecdc to\u00e1n l\u00e0 \u0111\u1ec3 \u00e1p d\u1ee5ng th\u1ef1c t\u1ebf, ph\u00e1t tri\u1ec3n t\u01b0 duy, th\u00f4ng minh linh ho\u1ea1t h\u01a1n. \u0110\u00f3 l\u00e0 t\u01b0 t\u01b0\u1edfng trong c\u00e1ch d\u1ea1y To\u00e1n c\u1ee7a t\u00f4i \u0111\u1ebfn h\u1ecdc sinh v\u00e0 c\u0169ng l\u00e0 xu th\u1ebf c\u1ee7a gi\u00e1o d\u1ee5c Vi\u1ec7t Nam h\u1ed9i nh\u1eadp th\u1ebf gi\u1edbi”.<\/p>\n","protected":false},"excerpt":{"rendered":"

M\u1ed7i ph\u1ee5 huynh \u0111\u01b0a ra m\u1ed9t \u00fd ki\u1ebfn kh\u00e1c nhau, \u00fd ki\u1ebfn n\u00e0o c\u0169ng c\u00f3<\/p>\n","protected":false},"author":1,"featured_media":7101,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-8798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tat-ca-bai-viet"],"_links":{"self":[{"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/8798","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8798"}],"version-history":[{"count":2,"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/8798\/revisions"}],"predecessor-version":[{"id":8800,"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/8798\/revisions\/8800"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=\/wp\/v2\/media\/7101"}],"wp:attachment":[{"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/doisongmoi.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}