{"id":2235,"date":"2026-07-19T16:48:27","date_gmt":"2026-07-19T09:48:27","guid":{"rendered":"https:\/\/new119.com\/?p=2235"},"modified":"2026-07-19T16:48:53","modified_gmt":"2026-07-19T09:48:53","slug":"cau-be-lam-phep-tinh-11-47-bi-gach-sai-me-len-kien-co-giao-thi-nhan-ve-cai-ket-dang-ca-lop-nay-moi-con-chi-sai-thoi","status":"publish","type":"post","link":"https:\/\/new119.com\/index.php\/2026\/07\/19\/cau-be-lam-phep-tinh-11-47-bi-gach-sai-me-len-kien-co-giao-thi-nhan-ve-cai-ket-dang-ca-lop-nay-moi-con-chi-sai-thoi\/","title":{"rendered":"C\u1eadu b\u00e9 l\u00e0m ph\u00e9p t\u00ednh ’11-4=7′ b\u1ecb g\u1ea1ch sai, m\u1eb9 l\u00ean ki\u1ec7n c\u00f4 gi\u00e1o th\u00ec nh\u1eadn v\u1ec1 c\u00e1i k\u1ebft \u0111\u1eafng: ‘C\u1ea3 l\u1edbp n\u00e0y m\u1ed7i con ch\u1ecb sai th\u00f4i’"},"content":{"rendered":"

C\u1eadu b\u00e9 l\u00e0m ph\u00e9p t\u00ednh \u201c11 – 4 = 7\u201d b\u1ecb c\u00f4 gi\u00e1o g\u1ea1ch sai, m\u1eb9 t\u00ecm \u0111\u1ebfn tr\u01b0\u1eddng ch\u1ea5t v\u1ea5n nh\u01b0ng nh\u1eadn c\u00e2u tr\u1ea3 l\u1eddi khi\u1ebfn ai c\u0169ng ph\u1ea3i ng\u1eabm.<\/h2>\n

To\u00e1n ti\u1ec3u h\u1ecdc v\u1ed1n ch\u1ec9 xoay quanh nh\u1eefng ph\u00e9p c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia c\u01a1 b\u1ea3n, nh\u01b0ng kh\u00f4ng \u00edt l\u1ea7n l\u1ea1i khi\u1ebfn c\u1ea3 ph\u1ee5 huynh c\u0169ng ph\u1ea3i b\u1ed1i r\u1ed1i. C\u00f3 nh\u1eefng b\u00e0i to\u00e1n t\u01b0\u1edfng nh\u01b0 r\u1ea5t d\u1ec5, ch\u1ec9 c\u1ea7n nh\u00ecn qua l\u00e0 c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi ngay, nh\u01b0ng n\u1ebfu kh\u00f4ng \u0111\u1ecdc k\u1ef9 \u0111\u1ec1 b\u00e0i th\u00ec l\u1ea1i r\u1ea5t d\u1ec5 m\u1eafc b\u1eaby. Ch\u00ednh v\u00ec v\u1eady, nhi\u1ec1u b\u00e0i t\u1eadp d\u00e0nh cho h\u1ecdc sinh ti\u1ec3u h\u1ecdc sau khi xu\u1ea5t hi\u1ec7n tr\u00ean m\u1ea1ng x\u00e3 h\u1ed9i \u0111\u00e3 tr\u1edf th\u00e0nh ch\u1ee7 \u0111\u1ec1 tranh lu\u1eadn s\u00f4i n\u1ed5i.<\/p>\n

M\u1edbi \u0111\u00e2y, m\u1ed9t b\u00e0i to\u00e1n c\u1ee7a h\u1ecdc sinh ti\u1ec3u h\u1ecdc t\u1ea1i Trung Qu\u1ed1c ti\u1ebfp t\u1ee5c thu h\u00fat s\u1ef1 quan t\u00e2m c\u1ee7a c\u01b0 d\u00e2n m\u1ea1ng. \u0110i\u1ec1u \u0111\u00e1ng n\u00f3i l\u00e0 ph\u00e9p t\u00ednh c\u1ee7a c\u1eadu b\u00e9 ho\u00e0n to\u00e0n \u0111\u00fang v\u1ec1 m\u1eb7t to\u00e1n h\u1ecdc, nh\u01b0ng v\u1eabn b\u1ecb gi\u00e1o vi\u00ean g\u1ea1ch sai.<\/p>\n

Theo n\u1ed9i dung \u0111\u1ec1 b\u00e0i, gi\u00e1o vi\u00ean \u0111\u1eb7t c\u00e2u h\u1ecfi:<\/p>\n

“Trong l\u1edbp h\u1ecdc c\u00f3 11 chi\u1ebfc \u0111\u00e8n, n\u1ebfu t\u1eaft \u0111i 4 chi\u1ebfc th\u00ec c\u00f2n l\u1ea1i m\u1ea5y chi\u1ebfc \u0111\u00e8n?”<\/p><\/blockquote>\n

Sau khi \u0111\u1ecdc \u0111\u1ec1, c\u1eadu h\u1ecdc sinh nhanh ch\u00f3ng th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh:<\/p>\n

11 – 4 = 7<\/p>\n

Tin r\u1eb1ng m\u00ecnh \u0111\u00e3 tr\u1ea3 l\u1eddi ch\u00ednh x\u00e1c, em t\u1ef1 tin n\u1ed9p b\u00e0i. Tuy nhi\u00ean, khi nh\u1eadn l\u1ea1i b\u00e0i ki\u1ec3m tra, c\u1eadu b\u00e9 b\u1ea5t ng\u1edd th\u1ea5y ph\u00e9p t\u00ednh c\u1ee7a m\u00ecnh b\u1ecb c\u00f4 gi\u00e1o d\u00f9ng b\u00fat \u0111\u1ecf g\u1ea1ch b\u1ecf.<\/p>\n

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<\/p>\n

 <\/p>\n

M\u1eb9 b\u1ee9c x\u00fac v\u00ec cho r\u1eb1ng gi\u00e1o vi\u00ean ch\u1ea5m sai<\/h3>\n

Khi xem b\u00e0i l\u00e0m c\u1ee7a con, ng\u01b0\u1eddi m\u1eb9 c\u0169ng kh\u00f4ng kh\u1ecfi th\u1eafc m\u1eafc. Theo ch\u1ecb, ph\u00e9p t\u00ednh “11 tr\u1eeb 4 b\u1eb1ng 7” ho\u00e0n to\u00e0n ch\u00ednh x\u00e1c, n\u00ean vi\u1ec7c gi\u00e1o vi\u00ean \u0111\u00e1nh sai l\u00e0 \u0111i\u1ec1u kh\u00f3 ch\u1ea5p nh\u1eadn.<\/p>\n

Mang theo b\u00e0i ki\u1ec3m tra, ch\u1ecb \u0111\u00e3 \u0111\u1ebfn g\u1eb7p c\u00f4 gi\u00e1o \u0111\u1ec3 h\u1ecfi r\u00f5 nguy\u00ean nh\u00e2n, \u0111\u1ed3ng th\u1eddi cho r\u1eb1ng c\u00f3 th\u1ec3 gi\u00e1o vi\u00ean \u0111\u00e3 s\u01a1 su\u1ea5t trong qu\u00e1 tr\u00ecnh ch\u1ea5m \u0111i\u1ec3m.<\/p>\n

Tuy nhi\u00ean, l\u1eddi gi\u1ea3i th\u00edch c\u1ee7a c\u00f4 gi\u00e1o l\u1ea1i khi\u1ebfn ng\u01b0\u1eddi m\u1eb9 ho\u00e0n to\u00e0n b\u1ea5t ng\u1edd.<\/p>\n

C\u00f4 nh\u1eb9 nh\u00e0ng n\u00f3i:<\/p>\n

“C\u1ea3 l\u1edbp ch\u1ec9 c\u00f3 con ch\u1ecb l\u00e0m sai th\u00f4i. \u0110\u00e8n t\u1eaft \u0111i th\u00ec v\u1eabn l\u00e0 \u0111\u00e8n, s\u1ed1 l\u01b0\u1ee3ng \u0111\u00e2u c\u00f3 thay \u0111\u1ed5i?”<\/p><\/blockquote>\n

Ch\u1ec9 v\u1edbi m\u1ed9t c\u00e2u tr\u1ea3 l\u1eddi ng\u1eafn g\u1ecdn, ng\u01b0\u1eddi m\u1eb9 l\u1eadp t\u1ee9c hi\u1ec3u ra v\u1ea5n \u0111\u1ec1.<\/p>\n

\u0110\u00e1p \u00e1n \u0111\u00fang kh\u00f4ng ph\u1ea3i l\u00e0 7 m\u00e0 l\u00e0… 11<\/h3>\n

Th\u1ef1c t\u1ebf, b\u00e0i to\u00e1n kh\u00f4ng y\u00eau c\u1ea7u t\u00ednh s\u1ed1 \u0111\u00e8n c\u00f2n s\u00e1ng m\u00e0 h\u1ecfi c\u00f2n l\u1ea1i bao nhi\u00eau chi\u1ebfc \u0111\u00e8n.<\/p>\n

Vi\u1ec7c t\u1eaft 4 chi\u1ebfc ch\u1ec9 l\u00e0m thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u00fang, ch\u1ee9 kh\u00f4ng l\u00e0m m\u1ea5t \u0111i s\u1ed1 l\u01b0\u1ee3ng \u0111\u00e8n trong l\u1edbp h\u1ecdc. D\u00f9 b\u1eadt hay t\u1eaft, c\u0103n ph\u00f2ng v\u1eabn c\u00f3 \u0111\u1ee7 11 chi\u1ebfc \u0111\u00e8n.<\/p>\n

V\u00ec v\u1eady, \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c ph\u1ea3i l\u00e0:<\/p>\n

11 chi\u1ebfc \u0111\u00e8n.<\/p>\n

Sau khi nghe c\u00f4 gi\u00e1o ph\u00e2n t\u00edch, ng\u01b0\u1eddi m\u1eb9 c\u0169ng th\u1eeba nh\u1eadn m\u00ecnh \u0111\u00e3 qu\u00e1 v\u1ed9i v\u00e0ng cho r\u1eb1ng gi\u00e1o vi\u00ean ch\u1ea5m sai. Ch\u1ecb b\u1eadt c\u01b0\u1eddi v\u00ec nh\u1eadn ra b\u1ea3n th\u00e2n c\u0169ng m\u1eafc b\u1eaby gi\u1ed1ng con.<\/p>\n

Gi\u00e1o vi\u00ean sau \u0111\u00f3 chia s\u1ebb th\u00eam:<\/p>\n

“\u0110\u1ec1 b\u00e0i n\u00e0y kh\u00f4ng ch\u1ec9 ki\u1ec3m tra kh\u1ea3 n\u0103ng t\u00ednh to\u00e1n m\u00e0 c\u00f2n mu\u1ed1n r\u00e8n cho h\u1ecdc sinh k\u1ef9 n\u0103ng \u0111\u1ecdc hi\u1ec3u v\u00e0 t\u01b0 duy logic. Nhi\u1ec1u khi h\u1ecdc gi\u1ecfi ch\u01b0a ch\u1eafc \u0111\u00e3 b\u1eb1ng hi\u1ec3u \u0111\u00fang b\u1ea3n ch\u1ea5t v\u1ea5n \u0111\u1ec1.”<\/p><\/blockquote>\n

B\u00e0i to\u00e1n g\u00e2y tranh lu\u1eadn tr\u00ean m\u1ea1ng x\u00e3 h\u1ed9i<\/h3>\n

Sau khi c\u00e2u chuy\u1ec7n \u0111\u01b0\u1ee3c chia s\u1ebb, nhi\u1ec1u ng\u01b0\u1eddi \u0111\u00e3 \u0111\u1ec3 l\u1ea1i nh\u1eefng quan \u0111i\u1ec3m kh\u00e1c nhau.<\/p>\n

M\u1ed9t b\u1ed9 ph\u1eadn cho r\u1eb1ng c\u00e1ch ra \u0111\u1ec1 c\u00f3 ph\u1ea7n \u0111\u00e1nh \u0111\u1ed1 h\u1ecdc sinh ti\u1ec3u h\u1ecdc.<\/p>\n

Theo h\u1ecd, khi m\u1edbi h\u1ecdc ph\u00e9p tr\u1eeb, ph\u1ea3n x\u1ea1 \u0111\u1ea7u ti\u00ean c\u1ee7a tr\u1ebb s\u1ebd l\u00e0 th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh 11 – 4 = 7. N\u1ebfu gi\u00e1o vi\u00ean mu\u1ed1n ki\u1ec3m tra kh\u1ea3 n\u0103ng suy lu\u1eadn th\u00ec n\u00ean di\u1ec5n \u0111\u1ea1t c\u00e2u h\u1ecfi r\u00f5 r\u00e0ng h\u01a1n \u0111\u1ec3 tr\u00e1nh g\u00e2y hi\u1ec3u nh\u1ea7m.<\/p>\n

C\u00f3 \u00fd ki\u1ebfn b\u00ecnh lu\u1eadn:<\/p>\n

“Tr\u1ebb m\u1edbi h\u1ecdc to\u00e1n s\u1ebd ngh\u0129 ngay \u0111\u1ebfn ph\u00e9p tr\u1eeb. V\u1edbi \u0111\u1ed9 tu\u1ed5i n\u00e0y, \u0111\u1ec1 nh\u01b0 v\u1eady kh\u00e1 d\u1ec5 khi\u1ebfn c\u00e1c em m\u1ea5t t\u1ef1 tin.”<\/p><\/blockquote>\n

\u1ede chi\u1ec1u ng\u01b0\u1ee3c l\u1ea1i, nhi\u1ec1u ng\u01b0\u1eddi l\u1ea1i \u0111\u00e1nh gi\u00e1 \u0111\u00e2y l\u00e0 m\u1ed9t d\u1ea1ng b\u00e0i gi\u00fap h\u1ecdc sinh r\u00e8n luy\u1ec7n kh\u1ea3 n\u0103ng \u0111\u1ecdc hi\u1ec3u v\u00e0 t\u01b0 duy th\u1ef1c t\u1ebf, thay v\u00ec ch\u1ec9 l\u00e0m to\u00e1n theo th\u00f3i quen.<\/p>\n

M\u1ed9t t\u00e0i kho\u1ea3n chia s\u1ebb:<\/p>\n

“To\u00e1n h\u1ecdc kh\u00f4ng ch\u1ec9 l\u00e0 t\u00ednh \u0111\u00fang ph\u00e9p t\u00ednh m\u00e0 c\u00f2n ph\u1ea3i hi\u1ec3u \u0111\u00fang \u0111i\u1ec1u \u0111\u1ec1 b\u00e0i \u0111ang h\u1ecfi. \u0110\u00e2y l\u00e0 c\u00e1ch gi\u00fap tr\u1ebb t\u1eadp suy ngh\u0129 tr\u01b0\u1edbc khi \u0111\u1eb7t b\u00fat l\u00e0m b\u00e0i.”<\/p><\/blockquote>\n

V\u00ec sao nh\u1eefng b\u00e0i to\u00e1n nh\u01b0 v\u1eady v\u1eabn \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o ch\u01b0\u01a1ng tr\u00ecnh?<\/h3>\n

Theo nhi\u1ec1u chuy\u00ean gia gi\u00e1o d\u1ee5c, b\u00ean c\u1ea1nh vi\u1ec7c r\u00e8n luy\u1ec7n k\u1ef9 n\u0103ng t\u00ednh to\u00e1n, h\u1ecdc sinh ti\u1ec3u h\u1ecdc c\u00f2n c\u1ea7n \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n n\u0103ng l\u1ef1c quan s\u00e1t, \u0111\u1ecdc hi\u1ec3u v\u00e0 t\u01b0 duy ph\u1ea3n bi\u1ec7n.<\/p>\n

Nh\u1eefng b\u00e0i to\u00e1n t\u00ecnh hu\u1ed1ng nh\u01b0 tr\u00ean bu\u1ed9c tr\u1ebb ph\u1ea3i \u0111\u1ecdc k\u1ef9 \u0111\u1ec1, x\u00e1c \u0111\u1ecbnh \u0111\u00fang y\u00eau c\u1ea7u r\u1ed3i m\u1edbi \u0111\u01b0a ra \u0111\u00e1p \u00e1n. \u0110i\u1ec1u n\u00e0y gi\u00fap h\u1ea1n ch\u1ebf th\u00f3i quen v\u1eeba nh\u00ecn th\u1ea5y s\u1ed1 li\u1ec7u \u0111\u00e3 l\u1eadp t\u1ee9c th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh m\u00e0 kh\u00f4ng suy ngh\u0129.<\/p>\n

Tuy nhi\u00ean, nhi\u1ec1u \u00fd ki\u1ebfn c\u0169ng cho r\u1eb1ng d\u1ea1ng c\u00e2u h\u1ecfi n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng v\u1edbi c\u00e1ch di\u1ec5n \u0111\u1ea1t r\u00f5 r\u00e0ng, ph\u00f9 h\u1ee3p l\u1ee9a tu\u1ed5i \u0111\u1ec3 v\u1eeba ph\u00e1t huy kh\u1ea3 n\u0103ng t\u01b0 duy c\u1ee7a h\u1ecdc sinh, v\u1eeba tr\u00e1nh t\u1ea1o c\u1ea3m gi\u00e1c \u0111\u00e1nh \u0111\u1ed1 ho\u1eb7c g\u00e2y tranh c\u00e3i kh\u00f4ng c\u1ea7n thi\u1ebft gi\u1eefa gi\u00e1o vi\u00ean v\u00e0 ph\u1ee5 huynh.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u1eadu b\u00e9 l\u00e0m ph\u00e9p t\u00ednh \u201c11 – 4 = 7\u201d b\u1ecb c\u00f4 gi\u00e1o g\u1ea1ch sai, m\u1eb9 t\u00ecm \u0111\u1ebfn tr\u01b0\u1eddng ch\u1ea5t v\u1ea5n nh\u01b0ng nh\u1eadn c\u00e2u tr\u1ea3 l\u1eddi khi\u1ebfn ai c\u0169ng ph\u1ea3i ng\u1eabm. To\u00e1n ti\u1ec3u h\u1ecdc v\u1ed1n ch\u1ec9 xoay quanh nh\u1eefng ph\u00e9p c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia c\u01a1 b\u1ea3n, nh\u01b0ng kh\u00f4ng \u00edt l\u1ea7n l\u1ea1i khi\u1ebfn c\u1ea3 ph\u1ee5 huynh […]<\/p>\n","protected":false},"author":1,"featured_media":2236,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chua-phan-loai"],"yoast_head":"\nC\u1eadu b\u00e9 l\u00e0m ph\u00e9p t\u00ednh '11-4=7' b\u1ecb g\u1ea1ch sai, m\u1eb9 l\u00ean ki\u1ec7n c\u00f4 gi\u00e1o th\u00ec nh\u1eadn v\u1ec1 c\u00e1i k\u1ebft \u0111\u1eafng: 'C\u1ea3 l\u1edbp n\u00e0y m\u1ed7i con ch\u1ecb sai th\u00f4i' - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/new119.com\/index.php\/2026\/07\/19\/cau-be-lam-phep-tinh-11-47-bi-gach-sai-me-len-kien-co-giao-thi-nhan-ve-cai-ket-dang-ca-lop-nay-moi-con-chi-sai-thoi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u1eadu b\u00e9 l\u00e0m ph\u00e9p t\u00ednh '11-4=7' b\u1ecb g\u1ea1ch sai, m\u1eb9 l\u00ean ki\u1ec7n c\u00f4 gi\u00e1o th\u00ec nh\u1eadn v\u1ec1 c\u00e1i k\u1ebft \u0111\u1eafng: 'C\u1ea3 l\u1edbp n\u00e0y m\u1ed7i con ch\u1ecb sai th\u00f4i' - Blog\" \/>\n<meta property=\"og:description\" content=\"C\u1eadu b\u00e9 l\u00e0m ph\u00e9p t\u00ednh \u201c11 – 4 = 7\u201d b\u1ecb c\u00f4 gi\u00e1o g\u1ea1ch sai, m\u1eb9 t\u00ecm \u0111\u1ebfn tr\u01b0\u1eddng ch\u1ea5t v\u1ea5n nh\u01b0ng nh\u1eadn c\u00e2u tr\u1ea3 l\u1eddi khi\u1ebfn ai c\u0169ng ph\u1ea3i ng\u1eabm. 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