{"id":3997,"date":"2018-08-07T04:04:36","date_gmt":"2018-08-07T04:04:36","guid":{"rendered":"https:\/\/kynaforkids.vn\/blog\/?p=3997"},"modified":"2018-12-25T07:18:21","modified_gmt":"2018-12-25T07:18:21","slug":"be-hoc-toan-lop-2-de-dang-neu-cha-me-cung-con-thuc-hien-5-tuyet-chieu","status":"publish","type":"post","link":"https:\/\/kynaforkids.vn\/blog\/be-hoc-toan-lop-2-de-dang-neu-cha-me-cung-con-thuc-hien-5-tuyet-chieu.html","title":{"rendered":"B\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 d\u1ec5 d\u00e0ng n\u1ebfu cha m\u1eb9 c\u00f9ng con th\u1ef1c hi\u1ec7n 5 tuy\u1ec7t chi\u00eau"},"content":{"rendered":"

B\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2<\/span>, b\u00e9 s\u1ebd d\u1ec5 \u201cb\u1ecb cho\u00e1ng\u201d b\u1edfi ch\u01b0\u01a1ng tr\u00ecnh n\u1eb7ng h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi l\u1edbp 1. L\u00fac b\u00e9 \u0111i t\u00ecm l\u1eddi gi\u1ea3i cho c\u00e1c b\u00e0i to\u00e1n c\u1ed9ng tr\u1eeb nh\u00e2n chia \u0111\u1ebfn h\u00e0ng tr\u0103m c\u0169ng l\u00e0 l\u00fac cha m\u1eb9 \u0111ang loay hoay t\u00ecm ra \u0111\u00e1p \u00e1n cho ph\u01b0\u01a1ng ph\u00e1p d\u1ea1y con h\u1ecdc to\u00e1n \u1edf giai \u0111o\u1ea1n n\u00e0y.<\/strong><\/p>\n

Kh\u00e1c v\u1edbi ch\u01b0\u01a1ng tr\u00ecnh l\u1edbp 1 ch\u1ec9 bao g\u1ed3m nh\u1eefng ph\u00e9p t\u00ednh \u0111\u01a1n gi\u1ea3n, khi b\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 s\u1ebd ngay l\u1eadp t\u1ee9c c\u1ea3m th\u1ea5y n\u1eb7ng n\u1ec1 v\u00e0 ch\u00e1n n\u1ea3n b\u1edfi nh\u1eefng con s\u1ed1 l\u00ean \u0111\u1ebfn h\u00e0ng tr\u0103m, ph\u00e9p t\u00ednh nh\u00e2n chia v\u00e0 s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a c\u00e1c b\u00e0i to\u00e1n \u0111\u1ed1. \u0110\u1ec3 gi\u00fap b\u00e9 v\u01b0\u1ee3t qua tr\u1edf ng\u1ea1i ban \u0111\u1ea7u v\u00e0 ch\u1ecbu y\u00eau th\u00edch m\u00f4n to\u00e1n, cha m\u1eb9 ph\u1ea3i l\u01b0u \u00fd nh\u1eefng \u0111i\u1ec1u sau:<\/span><\/p>\n

C\u00f3 g\u00ec trong ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n l\u1edbp 2?<\/strong><\/h2>\n

Ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n l\u1edbp 2 th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 kh\u00e1 n\u1eb7ng so v\u1edbi \u0111\u1ed9 tu\u1ed5i c\u1ee7a b\u00e9, do l\u00fac n\u00e0y, b\u00e9 \u0111ang chuy\u1ec3n giao t\u1eeb nh\u1eefng con s\u1ed1 \u0111\u01a1n gi\u1ea3n \u1edf l\u1edbp 1 sang vi\u1ec7c ph\u1ea3i t\u00ednh to\u00e1n c\u00e1c con s\u1ed1 l\u1edbn h\u01a1n, c\u00e1c ph\u00e9p to\u00e1n tr\u1eeb c\u00f3 nh\u1edb, c\u00e1c ph\u00e9p nh\u00e2n chia v\u1edbi 2, 3, 4, 5 v\u00e0 v\u1ecb kh\u00e1ch mang t\u00ean to\u00e1n \u0111\u1ed1 khi\u1ebfn c\u00e1c b\u00e9 kh\u00f4ng th\u1ec3 bi\u1ebft m\u00ecnh s\u1ebd th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh g\u00ec \u0111\u1ec3 t\u00ecm ra \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n cho b\u00e0i to\u00e1n. T\u1eeb \u0111\u00e2y, c\u00e1c b\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 d\u1ec5 n\u1ea3n l\u00f2ng v\u00e0 c\u00f3 xu h\u01b0\u1edbng gh\u00e9t b\u1ecf c\u00e1c con s\u1ed1 hay t\u00ecm \u0111\u1ebfn c\u00e1ch h\u1ecdc v\u1eb9t, h\u1ecdc \u0111\u1ed1i ph\u00f3.<\/span><\/p>\n

\"B\u00e9
B\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 ph\u1ee9c t\u1ea1p h\u01a1n v\u1edbi nhi\u1ec1u ph\u00e9p t\u00ednh, \u0111\u00f2i h\u1ecfi ph\u1ee5 huynh ph\u1ea3i d\u00e0nh nhi\u1ec1u th\u1eddi gian h\u1ecdc c\u00f9ng b\u00e9<\/figcaption><\/figure>\n

Khi hi\u1ec3u v\u00e0 n\u1eafm b\u1eaft \u0111\u01b0\u1ee3c ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc v\u00e0 t\u00e2m l\u00fd c\u1ee7a b\u00e9 r\u1ed3i, cha m\u1eb9 s\u1ebd d\u1ec5 t\u00ecm ra c\u00e1ch th\u1ee9c \u0111\u1ec3 \u0111\u1ed3ng h\u00e0nh v\u00e0 c\u00f9ng con \u201cv\u01b0\u1ee3t s\u00f3ng\u201d.<\/span><\/p>\n

Khi b\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 \u0111\u1eebng \u0111\u1ec3 con b\u01a1 v\u01a1<\/strong><\/h2>\n

Khi b\u1ea1n \u0111\u1ecdc m\u1ed9t quy\u1ec3n s\u00e1ch d\u00e0i to\u00e0n ch\u1eef, c\u1ea3m gi\u00e1c bu\u1ed3n ch\u00e1n v\u00e0 t\u1ebb nh\u1ea1t s\u1ebd ngay l\u1eadp t\u1ee9c g\u00f5 c\u1eeda. \u0110i\u1ec1u n\u00e0y t\u01b0\u01a1ng t\u1ef1 khi b\u00e9 \u0111\u1ecdc m\u1ed9t \u0111\u1ec1 to\u00e1n l\u1edbp 2 d\u00e0i ngo\u1eb1ng v\u1edbi c\u00e1c d\u1eef ki\u1ec7n \u0111an xen, b\u00e9 s\u1ebd mu\u1ed1n b\u1ecf cu\u1ed9c ngay h\u01a1n l\u00e0 t\u00ecm c\u00e1ch \u0111\u1ec3 gi\u1ea3i b\u00e0i to\u00e1n nh\u01b0 v\u1eady (nh\u1ea5t l\u00e0 \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 b\u00e9 ch\u01b0a \u0111\u1ecdc ch\u1eef tr\u00f4i ch\u1ea3y). V\u00ec th\u1ebf, b\u1ea1n n\u00ean c\u00f9ng con \u0111\u1ecdc \u0111\u1ec1 b\u00e0i, d\u1ea1y b\u00e9 c\u00e1ch l\u1ecdc ra c\u00e1c d\u1eef ki\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c cho v\u00e0 g\u1ea1ch ch\u00e2n \u1edf y\u00eau c\u1ea7u c\u1ee7a b\u00e0i to\u00e1n, c\u0169ng nh\u01b0 t\u1eeb kho\u00e1 gi\u00fap b\u00e9 nh\u1eadn d\u1ea1ng v\u00e0 t\u00ecm ra ph\u00e9p t\u00ednh n\u00e0o c\u1ea7n th\u1ef1c hi\u1ec7n \u0111\u1ec3 gi\u1ea3i b\u00e0i to\u00e1n. V\u00ed d\u1ee5: \u1edf b\u00e0i to\u00e1n \u0111\u1ed1 ph\u00e9p c\u1ed9ng t\u1eeb kho\u00e1 b\u00e1o hi\u1ec7u s\u1ebd l\u00e0 \u201c h\u00e3y t\u00ednh t\u1ed5ng c\u1ea3 hai l\u1edbp,\u2026\u201d, \u0111\u1ed1i v\u1edbi to\u00e1n tr\u1eeb s\u1ebd l\u00e0 \u201c \u00edt h\u01a1n, nh\u1eb9 h\u01a1n\u2026\u201d.<\/span><\/p>\n

L\u00e0m b\u00e0i t\u1eadp theo d\u1ea1ng<\/strong><\/h2>\n

B\u01b0\u1edbc \u0111\u1ea7u, b\u1ea1n c\u00f3 th\u1ec3 h\u01b0\u1edbng d\u1eabn b\u00e9 ph\u00e2n lo\u1ea1i b\u00e0i t\u1eadp to\u00e1n l\u1edbp 2 theo d\u1ea1ng nh\u01b0 x\u1ebfp c\u00e1c b\u00e0i to\u00e1n c\u1ed9ng, tr\u1eeb, nh\u00e2n, chia th\u00e0nh t\u1eebng nh\u00f3m ri\u00eang l\u1ebb r\u1ed3i t\u1eadp cho b\u00e9 t\u00ednh to\u00e1n. Ti\u1ebfp theo, b\u1ea1n y\u00eau c\u1ea7u b\u00e9 t\u1ef1 ph\u00e2n lo\u1ea1i v\u00e0 t\u00ednh to\u00e1n m\u00e0 kh\u00f4ng can thi\u1ec7p n\u1eefa. \u00a0\u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u00e9 kh\u00f4ng b\u1ecb r\u1ed1i v\u00e0 l\u00e2u d\u1ea7n s\u1ebd gi\u00fap b\u00e9 nh\u1eadn ra \u0111\u1eb7c \u0111i\u1ec3m chung c\u1ee7a t\u1eebng d\u1ea1ng b\u00e0i v\u00e0 c\u00f3 th\u1ec3 t\u1ef1 ph\u00e2n lo\u1ea1i r\u1ed3i l\u00e0m m\u00e0 kh\u00f4ng c\u1ea7n b\u1ea1n h\u1ed7 tr\u1ee3 n\u1eefa.<\/span><\/p>\n

D\u1ea1y con c\u00e1ch tr\u00ecnh b\u00e0y m\u1ed9t b\u00e0i to\u00e1n<\/strong><\/h2>\n

\u0110\u1ed1i v\u1edbi c\u00e1c ph\u00e9p t\u00ednh c\u1ed9ng tr\u1eeb nh\u00e2n chia, to\u00e1n l\u1edbp 2 y\u00eau c\u1ea7u b\u00e9 s\u1eafp ph\u00e9p t\u00ednh theo c\u1ed9t d\u1ecdc v\u00e0 t\u00ednh. B\u1ea1n n\u00ean h\u01b0\u1edbng d\u1eabn b\u00e9 c\u00e1ch \u0111\u1eb7t c\u00e1c con s\u1ed1 ngay h\u00e0ng, th\u1eb3ng l\u1ed1i. V\u1edbi b\u00e0i to\u00e1n \u0111\u1ed1, h\u00e3y d\u1ea1y b\u00e9 ghi l\u1eddi gi\u1ea3i v\u00e0 ghi k\u00e8m \u0111\u01a1n v\u1ecb ph\u00eda sau \u0111\u00e1p \u00e1n \u201c S\u1ed1 qu\u1ea3 t\u00e1o c\u00f3 l\u00e0: 32 (qu\u1ea3)\u201d. B\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 c\u1ea7n \u0111\u01b0\u1ee3c r\u00e8n t\u00ednh c\u1ea9n th\u1eadn, chi ti\u1ebft m\u1edbi c\u00f3 th\u1ec3 t\u00ednh to\u00e1n \u0111\u00fang, v\u1edf s\u1ea1ch \u0111\u1eb9p.<\/span><\/p>\n

\"B\u00e9
B\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 c\u1ea7n x\u1ebfp ph\u00e9p t\u00ednh \u0111\u1ee9ng th\u1eb3ng h\u00e0ng<\/figcaption><\/figure>\n

L\u00fac n\u00e0y b\u1ea1n c\u0169ng n\u00ean t\u1eadp cho b\u00e9 t\u00ednh nhanh c\u00e1c ph\u00e9p t\u00ednh c\u00f3 t\u1ed5ng t\u1eeb 11 \u0111\u1ebfn 18, ph\u00e9p tr\u1eeb trong ph\u1ea1m vi 20. \u0110\u00e2y l\u00e0 c\u00e1ch gi\u00fap con b\u1ea1n t\u00ednh nhanh v\u00e0 d\u1ec5 d\u00e0ng h\u01a1n khi th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh c\u1ed9ng tr\u1eeb c\u00f3 nh\u1edb \u0111\u1ebfn h\u00e0ng 100.<\/span><\/p>\n

\u1ede d\u1ea1ng to\u00e1n nh\u00e2n, b\u1ea1n n\u00ean l\u01b0u \u00fd cho con t\u00ednh ch\u1ea5t nh\u01b0 2 x3 ngh\u0129a l\u00e0 b\u1eb1ng 2+2+2 \u0111\u1ec3 b\u00e9 hi\u1ec3u r\u00f5, nh\u1edb s\u00e2u v\u00e0 l\u00e2u h\u01a1n.<\/span><\/p>\n

\u0110\u1eebng cho c\u00e1 d\u1ec5 d\u00e0ng<\/strong><\/h2>\n

B\u1ea1n c\u00f3 th\u1ec3 cho b\u00e9 c\u1ea7n c\u00e2u, gi\u00fap b\u00e9 m\u1eafc m\u1ed3i nh\u01b0ng \u0111\u1eebng c\u00e2u lu\u00f4n r\u1ed3i mang c\u00e1 cho con. Khi con c\u00e1 d\u1ec5 d\u00e0ng \u0111\u1ebfn tay, b\u00e9 s\u1ebd ngay l\u1eadp t\u1ee9c c\u00f3 th\u00e1i \u0111\u1ed9 \u1ef7 l\u1ea1i v\u00e0 l\u01b0\u1eddi v\u1eadn \u0111\u1ed9ng tr\u00ed l\u1ef1c. \u00a0H\u00e3y \u0111\u1ec3 b\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2 c\u00f3 th\u1eddi gian m\u00e0y m\u00f2, suy ngh\u0129 \u0111\u1ec3 r\u00e8n luy\u1ec7n s\u1ef1 t\u1eadp trung, ki\u00ean tr\u00ec v\u00e0 nh\u1ea1y b\u00e9n. \u0110i\u1ec1u n\u00e0y c\u0169ng \u0111\u00f2i h\u1ecfi \u1edf b\u1ea1n s\u1ef1 ki\u00ean quy\u1ebft n\u00f3i \u201cKh\u00f4ng\u201d v\u1edbi v\u1ebb v\u00f2i v\u0129nh c\u1ee7a b\u00e9. <\/span><\/p>\n

N\u1ebfu b\u00e9 kh\u00f4ng hi\u1ec3u, h\u00e3y ki\u00ean nh\u1eabn gi\u1ea3ng d\u1ea1y l\u1ea7n n\u1eefa, g\u1ee3i \u00fd cho b\u00e9 m\u1ed9t v\u00e0i d\u1eef ki\u1ec7n \u0111\u1ec3 b\u00e9 t\u1ef1 m\u00ecnh t\u00ecm ra \u0111\u00e1p s\u1ed1. \u0110\u1eebng v\u00ec x\u00f3t con hay v\u00ec b\u1ea3n th\u00e2n kh\u00f4ng c\u00f3 th\u1eddi gian m\u00e0 cho ngay \u0111\u00e1p s\u1ed1 \u0111\u1ec3 xong chuy\u1ec7n. V\u00ec \u201ck\u1ebft qu\u1ea3\u201d kh\u00f4ng n\u1eb1m \u1edf hi\u1ec7n t\u1ea1i m\u00e0 n\u1eb1m \u1edf t\u01b0\u01a1ng lai b\u00e9 s\u1ebd quen v\u1edbi vi\u1ec7c h\u1ecdc v\u1eb9t, h\u1ecdc m\u00e1y m\u00f3c.<\/span><\/p>\n

To\u00e1n l\u1edbn 2 s\u1ebd kh\u00f4ng kh\u00f3 v\u1edbi b\u00e9 n\u1ebfu b\u1ea1n ch\u1ecbu l\u00e0m ng\u01b0\u1eddi b\u1ea1n \u0111\u1ed3ng h\u00e0nh t\u1ed1t.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

B\u00e9 h\u1ecdc to\u00e1n l\u1edbp 2, b\u00e9 s\u1ebd d\u1ec5 \u201cb\u1ecb cho\u00e1ng\u201d b\u1edfi ch\u01b0\u01a1ng tr\u00ecnh n\u1eb7ng h\u01a1n r\u1ea5t nhi\u1ec1u so v\u1edbi l\u1edbp 1. L\u00fac b\u00e9 \u0111i t\u00ecm l\u1eddi gi\u1ea3i cho c\u00e1c b\u00e0i to\u00e1n c\u1ed9ng tr\u1eeb nh\u00e2n chia \u0111\u1ebfn h\u00e0ng tr\u0103m c\u0169ng l\u00e0 l\u00fac cha m\u1eb9 \u0111ang loay hoay t\u00ecm ra \u0111\u00e1p \u00e1n cho ph\u01b0\u01a1ng ph\u00e1p d\u1ea1y con<\/p>\n","protected":false},"author":1,"featured_media":3998,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3363],"tags":[672,674,2261,673],"class_list":{"0":"post-3997","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-toan-tu-duy","8":"tag-be-hoc-toan-lop-2","9":"tag-day-be-hoc-toan-lop-2-tai-nha","10":"tag-day-con","11":"tag-toan-lop-2-hoc-gi"},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/posts\/3997","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/comments?post=3997"}],"version-history":[{"count":0,"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/posts\/3997\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/media\/3998"}],"wp:attachment":[{"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/media?parent=3997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/categories?post=3997"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kynaforkids.vn\/blog\/wp-json\/wp\/v2\/tags?post=3997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}