Theo \u0111\u00f3 \u0111\u01b0\u1ee3c bi\u1ebft, \u0111\u1ee9a tr\u1ebb sau khi \u0111i h\u1ecdc v\u1ec1 \u0111\u00e3 than th\u1edf v\u1edbi b\u1ed1 v\u00ec v\u1eeba nh\u1eadn \u0111\u01b0\u1ee3c \u0111i\u1ec3m to\u00e1n \u1edf tr\u01b0\u1eddng th\u1ea5p. \u00d4ng b\u1ed1 m\u1edf c\u1eb7p s\u00e1ch con ra xem, \u0111\u1ecbnh s\u1ebd h\u01b0\u1edbng d\u1eabn v\u00e0 g\u00f3p \u00fd \u0111\u1ec3 con r\u00fat kinh nghi\u1ec7m cho nh\u1eefng l\u1ea7n sau. Th\u1ebf nh\u01b0ng khi ki\u1ec3m tra b\u00e0i l\u00e0m c\u1ee7a con, ng\u01b0\u1eddi b\u1ed1 \u0111\u1ee9ng h\u00ecnh m\u1ea5t v\u00e0i ph\u00fat, hoang mang kh\u00f4ng hi\u1ec3u l\u00fd do t\u1ea1i sao b\u00e0i to\u00e1n n\u00e0y c\u1ee7a con l\u1ea1i b\u1ecb c\u00f4 ch\u1ea5m sai.<\/p>\n \u00d4ng b\u1ed1 sau \u0111\u00f3 \u0111\u00e3 \u0111\u0103ng b\u00e0i l\u00e0m c\u1ee7a \u0111\u1ee9a tr\u1ebb l\u00ean m\u1ea1ng v\u00e0 b\u00e0y t\u1ecf th\u1eafc m\u1eafc, mong c\u1ed9ng \u0111\u1ed3ng m\u1ea1ng c\u00f3 th\u1ec3 gi\u1ea3i th\u00edch gi\u00fap m\u00ecnh. C\u1ee5 th\u1ec3 \u0111\u1ec1 b\u00e0i to\u00e1n gi\u00e1o vi\u00ean \u0111\u01b0a ra l\u00e0: \u201c7 con b\u00f2 c\u00f3 bao nhi\u00eau ch\u00e2n?\u201d v\u00e0 ph\u00e9p t\u00ednh b\u00e9 ti\u1ec3u h\u1ecdc \u0111\u00e3 th\u1ef1c hi\u1ec7n l\u00e0 7\u00d74=28. R\u00f5 r\u00e0ng v\u1edbi \u0111\u00e1p \u00e1n n\u00e0y, ai c\u0169ng ngh\u0129 \u0111\u1ee9a tr\u1ebb \u0111\u00e3 l\u00e0m \u0111\u00fang. Tuy nhi\u00ean, c\u00f4 gi\u00e1o \u0111\u00e3 khoanh \u0111\u1ecf, v\u00e0 s\u1eeda l\u1ea1i m\u1ed9t k\u1ebft qu\u1ea3 kh\u00e1c l\u00e0 4\u00d77=28. V\u1eady 2 ph\u00e9p t\u00ednh n\u00e0y c\u00f3 g\u00ec kh\u00e1c nhau? \u0110\u00e2y l\u00e0 \u0111i\u1ec1u g\u00e2y kh\u00f3 hi\u1ec3u \u0111\u1ed1i v\u1edbi r\u1ea5t nhi\u1ec1u ph\u1ee5 huynh.<\/strong><\/p>\n B\u00e0i \u0111\u0103ng c\u1ee7a \u00f4ng b\u1ed1 \u0111\u00e3 g\u00e2y n\u00ean nhi\u1ec1u tranh c\u00e3i, \u0111a s\u1ed1 \u0111\u1ec1u ph\u1eabn n\u1ed9 tr\u01b0\u1edbc c\u00e1ch ch\u1ea5m c\u1ee7a gi\u00e1o vi\u00ean, v\u00e0 \u0111\u1ed3ng t\u00ecnh v\u1edbi \u0111\u00e1p \u00e1n b\u00e9 h\u1ecdc sinh \u0111\u01b0a ra. Tuy nhi\u00ean, c\u00f3 m\u1ed9t v\u00e0i c\u1ed9ng \u0111\u1ed3ng m\u1ea1ng n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c n\u00ean \u0111\u00e3 l\u00ean ti\u1ebfng gi\u1ea3i th\u00edch, v\u00e0 nh\u1edd \u0111\u00f3 m\u00e0 nhi\u1ec1u ng\u01b0\u1eddi m\u1edbi nh\u1eadn ra v\u1ea5n \u0111\u1ec1.<\/p>\n Theo \u0111\u00f3, h\u1ecd cho r\u1eb1ng k\u1ebft qu\u1ea3 b\u1eb1ng 28 l\u00e0 k\u1ebft qu\u1ea3 ho\u00e0n to\u00e0n ch\u00ednh x\u00e1c, song c\u00e1i sai \u1edf \u0111\u00e2y c\u1ee7a h\u1ecdc sinh l\u00e0 c\u00e1ch t\u00ednh. C\u00e2u h\u1ecfi c\u1ee7a b\u00e0i to\u00e1n l\u00e0 \u201c7 con b\u00f2 c\u00f3 bao nhi\u00eau ch\u00e2n\u201d? th\u00ec h\u1ecdc sinh ph\u1ea3i \u0111\u1eb7t ph\u00e9p to\u00e1n l\u00e0 \u201c4 (m\u1ed7i con b\u00f2 c\u00f3 4 ch\u00e2n) x 7 (s\u1ed1 l\u01b0\u1ee3ng b\u00f2) = 28 ch\u00e2n\u201d m\u1edbi ch\u00ednh x\u00e1c. D\u00f9 \u0111\u01b0a k\u1ebft qu\u1ea3 \u0111\u00fang nh\u01b0ng c\u00e1ch l\u00e0m c\u1ee7a em h\u1ecdc sinh l\u00e0 sai n\u00ean v\u1eabn b\u1ecb c\u00f4 gi\u00e1o \u0111\u00e1nh gi\u00e1.<\/p>\n Trong to\u00e1n h\u1ecdc v\u1edbi ph\u00e9p nh\u00e2n, lu\u00f4n c\u00f3 s\u1ef1 ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa \u201cs\u1ed1 nh\u00e2n\u201d v\u00e0 \u201cs\u1ed1 b\u1ecb nh\u00e2n\u201d. Do \u0111\u00f3 v\u1edbi b\u00e0i to\u00e1n tr\u00ean th\u00ec h\u1ecdc sinh ph\u1ea3i \u0111\u1eb7t \u201cs\u1ed1 nh\u00e2n\u201d l\u00e0 4 \u0111\u1ee9ng tr\u01b0\u1edbc v\u00e0 \u201cs\u1ed1 b\u1ecb nh\u00e2n\u201d l\u00e0 7 \u0111\u1ee9ng sau. Vi\u1ec7c em h\u1ecdc sinh kia \u0111\u1eb7t ph\u00e9p to\u00e1n sai t\u1ee9c l\u00e0 \u0111\u00e3 x\u00e1c \u0111\u1ecbnh sai s\u1ed1 nh\u00e2n v\u00e0 s\u1ed1 b\u1ecb nh\u00e2n, do \u0111\u00f3 c\u00f4 gi\u00e1o v\u1eabn kh\u00f4ng th\u1ec3 \u0111\u1ed3ng \u00fd \u0111\u00e1nh gi\u00e1 \u0111\u00fang k\u1ebft qu\u1ea3 c\u1ee7a em h\u1ecdc sinh \u0111\u01b0\u1ee3c.<\/strong><\/p>\n Sau khi l\u1eddi gi\u1ea3i th\u00edch \u0111\u01b0\u1ee3c \u0111\u01b0a ra nhi\u1ec1u ng\u01b0\u1eddi \u0111\u1ed3ng t\u00ecnh nh\u01b0ng c\u0169ng l\u00ean ti\u1ebfng cho r\u1eb1ng b\u00e0i to\u00e1n nh\u01b0 th\u1ebf n\u00e0y l\u00e0 l\u00e0m kh\u00f3 h\u1ecdc sinh. Tuy nhi\u00ean c\u0169ng c\u00f3 c\u01b0 d\u00e2n m\u1ea1ng l\u1ea1i cho r\u1eb1ng \u0111\u00f3 l\u00e0 s\u1ef1 ph\u00e2n bi\u1ec7t gi\u1eefa h\u1ecdc sinh gi\u1ecfi v\u00e0 h\u1ecdc sinh k\u00e9m, h\u1ecdc sinh gi\u1ecfi s\u1ebd bi\u1ebft c\u00e1ch nh\u1eadn bi\u1ebft t\u00ednh ch\u1ea5t th\u1eadt c\u1ee7a b\u00e0i to\u00e1n.<\/p>\n V\u1edbi b\u00e0i to\u00e1n ph\u00eda tr\u00ean c\u00f3 s\u1ef1 tr\u00f9ng h\u1ee3p l\u00e0 d\u00f9 gi\u1ea3i nh\u01b0 th\u1ebf n\u00e0o th\u00ec k\u1ebft qu\u1ea3 v\u1eabn cho l\u00e0 28. Tuy nhi\u00ean kh\u00f4ng ph\u1ea3i ph\u00e9p t\u00ednh, b\u00e0i to\u00e1n n\u00e0o c\u0169ng may m\u1eafn nh\u01b0 th\u1ebf n\u00ean ph\u01b0\u01a1ng ph\u00e1p gi\u00e1o d\u1ee5c v\u00e0 l\u1eddi \u0111\u00e1p c\u1ee7a c\u00f4 gi\u00e1o qu\u1ea3 th\u1ef1c ch\u00ednh x\u00e1c. V\u00ec v\u1eady c\u00e1c b\u1ed1 m\u1eb9 ch\u00ednh l\u00e0 ng\u01b0\u1eddi lu\u00f4n nh\u1eafc nh\u1edf con ph\u1ea3i c\u1ea9n th\u1eadn v\u00e0 xem x\u00e9t k\u0129 t\u1ea5t c\u1ea3 c\u00e1c b\u00e0i to\u00e1n.<\/p>\n Ph\u1ee5 huynh n\u00ean l\u00e0m g\u00ec khi ph\u00e1t hi\u1ec7n c\u00f4 gi\u00e1o ch\u1ea5m b\u00e0i cho con sai?<\/strong><\/p>\n Vi\u1ec7c ph\u00e1t hi\u1ec7n gi\u00e1o vi\u00ean ch\u1ea5m b\u00e0i sai cho con l\u00e0 m\u1ed9t t\u00ecnh hu\u1ed1ng kh\u00f4ng mong mu\u1ed1n, nh\u01b0ng n\u00f3 c\u0169ng l\u00e0 c\u01a1 h\u1ed9i \u0111\u1ec3 ph\u1ee5 huynh c\u00f9ng gi\u00e1o vi\u00ean xem x\u00e9t v\u00e0 c\u1ea3i thi\u1ec7n ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3ng d\u1ea1y, \u0111\u1ea3m b\u1ea3o quy\u1ec1n l\u1ee3i h\u1ecdc t\u1eadp t\u1ed1t nh\u1ea5t cho tr\u1ebb. Khi g\u1eb7p t\u00ecnh hu\u1ed1ng n\u00e0y, ph\u1ee5 huynh n\u00ean x\u1eed l\u00fd b\u00ecnh t\u0129nh, kh\u00e9o l\u00e9o v\u00e0 mang t\u00ednh x\u00e2y d\u1ef1ng \u0111\u1ec3 tr\u00e1nh g\u00e2y m\u00e2u thu\u1eabn kh\u00f4ng \u0111\u00e1ng c\u00f3. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c b\u01b0\u1edbc g\u1ee3i \u00fd \u0111\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1:<\/p>\n 1. Ki\u1ec3m tra k\u1ef9 l\u01b0\u1ee1ng b\u00e0i l\u00e0m c\u1ee7a con<\/strong><\/em><\/p>\n Tr\u01b0\u1edbc khi k\u1ebft lu\u1eadn r\u1eb1ng c\u00f4 gi\u00e1o \u0111\u00e3 ch\u1ea5m sai, ph\u1ee5 huynh c\u1ea7n d\u00e0nh th\u1eddi gian ki\u1ec3m tra k\u1ef9 b\u00e0i l\u00e0m c\u1ee7a con, \u0111\u1ed1i chi\u1ebfu v\u1edbi \u0111\u00e1p \u00e1n (n\u1ebfu c\u00f3) ho\u1eb7c h\u1ecfi \u00fd ki\u1ebfn nh\u1eefng ng\u01b0\u1eddi c\u00f3 chuy\u00ean m\u00f4n. C\u00f3 th\u1ec3 trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, l\u1ed7i kh\u00f4ng ho\u00e0n to\u00e0n n\u1eb1m \u1edf gi\u00e1o vi\u00ean m\u00e0 xu\u1ea5t ph\u00e1t t\u1eeb vi\u1ec7c hi\u1ec3u sai \u0111\u1ec1 b\u00e0i ho\u1eb7c c\u00e1ch di\u1ec5n \u0111\u1ea1t ch\u01b0a r\u00f5 r\u00e0ng c\u1ee7a h\u1ecdc sinh.<\/p>\n 2. Trao \u0111\u1ed5i v\u1edbi con v\u1ec1 b\u00e0i l\u00e0m<\/strong><\/em><\/p>\n H\u00e3y h\u1ecfi con \u0111\u1ec3 hi\u1ec3u th\u00eam v\u1ec1 c\u00e1ch l\u00e0m b\u00e0i c\u1ee7a tr\u1ebb, l\u00fd do v\u00ec sao con ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00f3 v\u00e0 xem con c\u00f3 th\u1ef1c s\u1ef1 hi\u1ec3u b\u00e0i kh\u00f4ng. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n n\u1eafm r\u00f5 v\u1ea5n \u0111\u1ec1 m\u00e0 c\u00f2n t\u1ea1o c\u01a1 h\u1ed9i \u0111\u1ec3 d\u1ea1y con t\u01b0 duy ph\u1ea3n bi\u1ec7n v\u00e0 gi\u1ea3i th\u00edch khi c\u1ea7n b\u1ea3o v\u1ec7 quan \u0111i\u1ec3m c\u1ee7a m\u00ecnh.<\/p>\n 3. G\u1eb7p g\u1ee1 c\u00f4 gi\u00e1o \u0111\u1ec3 trao \u0111\u1ed5i<\/strong><\/em><\/p>\n N\u1ebfu ph\u1ee5 huynh ch\u1eafc ch\u1eafn r\u1eb1ng gi\u00e1o vi\u00ean \u0111\u00e3 ch\u1ea5m sai, vi\u1ec7c \u0111\u1ea7u ti\u00ean c\u1ea7n l\u00e0m l\u00e0 trao \u0111\u1ed5i tr\u1ef1c ti\u1ebfp v\u1edbi gi\u00e1o vi\u00ean m\u1ed9t c\u00e1ch l\u1ecbch s\u1ef1 v\u00e0 mang t\u00ednh x\u00e2y d\u1ef1ng. H\u00e3y li\u00ean h\u1ec7 tr\u01b0\u1edbc \u0111\u1ec3 s\u1eafp x\u1ebfp th\u1eddi gian thu\u1eadn ti\u1ec7n v\u00e0 tr\u00ecnh b\u00e0y v\u1ea5n \u0111\u1ec1 m\u1ed9t c\u00e1ch b\u00ecnh t\u0129nh.<\/p>\n \u2013 C\u00e1ch ti\u1ebfp c\u1eadn: B\u1eaft \u0111\u1ea7u b\u1eb1ng l\u1eddi c\u1ea3m \u01a1n v\u00ec c\u00f4 gi\u00e1o \u0111\u00e3 n\u1ed7 l\u1ef1c trong vi\u1ec7c gi\u1ea3ng d\u1ea1y v\u00e0 ch\u0103m s\u00f3c h\u1ecdc sinh. Sau \u0111\u00f3, nh\u1eb9 nh\u00e0ng ch\u1ec9 ra ch\u1ed7 m\u00e0 b\u1ea1n ngh\u0129 r\u1eb1ng c\u00f4 gi\u00e1o \u0111\u00e3 ch\u1ea5m ch\u01b0a \u0111\u00fang.<\/p>\n \u2013 Th\u00e1i \u0111\u1ed9: Gi\u1eef th\u00e1i \u0111\u1ed9 t\u00f4n tr\u1ecdng, kh\u00f4ng ch\u1ec9 tr\u00edch ho\u1eb7c ph\u00e1n x\u00e9t, m\u00e0 thay v\u00e0o \u0111\u00f3 l\u00e0 c\u00f9ng c\u00f4 gi\u00e1o th\u1ea3o lu\u1eadn \u0111\u1ec3 t\u00ecm gi\u1ea3i ph\u00e1p.<\/p>\n","protected":false},"excerpt":{"rendered":" Khi m\u1edbi \u0111\u1ecdc qua, ai c\u0169ng cho r\u1eb1ng b\u00e9 ti\u1ec3u h\u1ecdc \u0111\u00e3 l\u00e0m b\u00e0i to\u00e1n r\u1ea5t \u0111\u00fang nh\u01b0ng kh\u00f4ng hi\u1ec3u sao c\u00f4 gi\u00e1o l\u1ea1i ch\u1ea5m l\u00e0 \u2018sai\u2019. \u0110i k\u00e8m v\u1edbi \u0111\u00f3, c\u00f4 gi\u00e1o \u0111\u01b0a ra \u0111\u00e1p \u00e1n b\u1ea5t ng\u1edd l\u1ea1i c\u00e0ng khi\u1ebfn d\u00e2n t\u00ecnh tranh c\u00e3i d\u1eef d\u1ed9i h\u01a1n n\u1eefa. C\u1ee5 th\u1ec3, \u0111\u00e2y l\u00e0 tr\u01b0\u1eddng […]<\/p>\n","protected":false},"author":1,"featured_media":897,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-896","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chua-phan-loai"],"_links":{"self":[{"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=896"}],"version-history":[{"count":1,"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/896\/revisions"}],"predecessor-version":[{"id":898,"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/896\/revisions\/898"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=\/wp\/v2\/media\/897"}],"wp:attachment":[{"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chuyendoisong.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"h\u00ecnh](\"https:\/\/lh3.googleusercontent.com\/8Z1Cys5r3-CDzNBMFC8v6JTQbYLm9cjZiU1fGm1d8rBhIYhvklOaUYYC_L9HNxR3Z6SEgESdmqCiZfBkvp4elofg35iIhR5z9SC7fl551A=w622\")
![\"h\u00ecnh](\"https:\/\/lh3.googleusercontent.com\/9LWXb7v0lesv82-OvGmgnvPg7hP3MoGA_7aPInLboGI1NBDxIPTOx9mLop8-u3ksz9EJt-rt8iDioTNvnFl9qckbo6Rn--qwG1lZVOTqNA=w622\")