{"id":2719,"date":"2021-10-14T21:26:08","date_gmt":"2021-10-14T14:26:08","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=2719"},"modified":"2021-10-14T22:11:06","modified_gmt":"2021-10-14T15:11:06","slug":"bai-giang-chi-tiet-quy-tac-dau-ngoac-cho-hoc-sinh-lop-6","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/bai-giang-chi-tiet-quy-tac-dau-ngoac-cho-hoc-sinh-lop-6\/","title":{"rendered":"B\u00e0i gi\u1ea3ng chi ti\u1ebft quy t\u1eafc d\u1ea5u ngo\u1eb7c cho h\u1ecdc sinh l\u1edbp 6"},"content":{"rendered":"\n<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p>Quy t\u1eafc d\u1ea5u ngo\u1eb7c trong <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n<\/a> h\u1ecdc l\u1edbp 6 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t b\u00e0i gi\u1ea3ng g\u00f3p ph\u1ea7n c\u1ee7ng c\u1ed1. V\u00e0 m\u1edf r\u1ed9ng c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc. Nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c h\u1ecdc v\u00e0 nh\u1edb xuy\u00ean su\u1ed1t qu\u00e1 tr\u00ecnh h\u1ecdc to\u00e1n. Kh\u00f4ng ch\u1ec9 \u1edf b\u1eadc trung h\u1ecdc c\u01a1 s\u1edf. M\u00e0 c\u00f2n ph\u1ee5c v\u1ee5 cho qu\u00e1 tr\u00ecnh <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> v\u00e0 nghi\u00ean c\u1ee9u c\u00e1c d\u1ea1ng to\u00e1n sau n\u00e0y.<\/p>\n\n\n\n<p>L\u00fd thuy\u1ebft \u2013 chi ti\u1ebft b\u00e0i gi\u1ea3ng v\u1ec1 quy t\u1eafc d\u1ea5u ngo\u1eb7c cho <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> l\u1edbp 6<\/p>\n\n\n\n<p>L\u00fd thuy\u1ebft v\u1ec1 quy t\u1eafc d\u1ea5u ngo\u1eb7c<\/p>\n\n\n\n<p>L\u00fd thuy\u1ebft v\u1ec1 quy t\u1eafc d\u1ea5u ngo\u1eb7c hay c\u1ee5 th\u1ec3 trong b\u00e0i gi\u1ea3ng l\u1edbp 6 l\u00e0 quy t\u1eafc b\u1ecf d\u1ea5u ngo\u1eb7c. V\u1ec1 c\u01a1 b\u1ea3n c\u00f3 2 \u0111i\u1ec3m t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi 2 tr\u01b0\u1eddng h\u1ee3p c\u1ea7n l\u01b0u \u00fd v\u00e0 ghi nh\u1edb:<\/p>\n\n\n\n<p>Khi b\u1ecf d\u1ea5u ngo\u1eb7c m\u00e0 tr\u01b0\u1edbc \u0111\u00f3 l\u00e0 d\u1ea5u \u201c-\u201d: Ta ph\u1ea3i \u0111\u1ed5i d\u1ea5u t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 h\u1ea1ng c\u00f3 trong d\u1ea5u ngo\u1eb7c. C\u1ee5 th\u1ec3 l\u00e0: N\u1ebfu c\u00e1c s\u1ed1 h\u1ea1ng trong ngo\u1eb7c c\u00f3 d\u1ea5u \u201c-\u201d ph\u1ea3i \u0111\u1ed5i th\u00e0nh \u201c+\u201d. V\u00e0 ng\u01b0\u1ee3c l\u1ea1i, \u0111\u1ed5i \u201c+\u201d th\u00e0nh \u201c-\u201d<\/p>\n\n\n\n<p>V\u00ed d\u1ee5: a \u2013 (b+ c \u2013 d) = a \u2013 b \u2013 c + d<\/p>\n\n\n\n<p>Nh\u01b0 quan s\u00e1t, ta th\u1ea5y, tr\u01b0\u1edbc ngo\u1eb7c (b + c \u2013 d) l\u00e0 d\u1ea5u \u201c- \u201c. V\u00ec v\u1eady, mu\u1ed1n b\u1ecf ngo\u1eb7c, ta \u0111\u1ed5i d\u1ea5u c\u1ee7a c\u00e1c s\u1ed1 h\u1ea1ng trong ngo\u1eb7c: b th\u00e0nh \u201c-b\u201d, \u201c+c\u201d th\u00e0nh \u201c-c\u201d, \u201c-d\u201d th\u00e0nh \u201c+d\u201d.<\/p>\n\n\n\n<p>Khi b\u1ecf d\u1ea5u ngo\u1eb7c m\u00e0 tr\u01b0\u1edbc \u0111\u00f3 l\u00e0 d\u1ea5u \u201c+\u201d. Ta gi\u1eef nguy\u00ean d\u1ea5u c\u00e1c s\u1ed1 h\u1ea1ng trong d\u1ea5u ngo\u1eb7c.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5: a + (b +c -d)= a + b + c \u2013 d<\/p>\n\n\n\n<p>L\u00fd thuy\u1ebft \u2013 chi ti\u1ebft b\u00e0i gi\u1ea3ng v\u1ec1 quy t\u1eafc d\u1ea5u ngo\u1eb7c cho <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> l\u1edbp 6<\/p>\n\n\n\n<p>L\u00fd thuy\u1ebft v\u1ec1 t\u1ed5ng \u0111\u1ea1i s\u1ed1<\/p>\n\n\n\n<p>V\u1ec1 c\u01a1 b\u1ea3n, ph\u00e9p tr\u1eeb c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c coi l\u00e0 ph\u00e9p c\u1ed9ng v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a n\u00f3. V\u00ec v\u1eady, ta ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 \u0111\u1ed5i m\u1ed9t d\u00e3y ph\u00e9p t\u00ednh bao g\u1ed3m ph\u00e9p c\u1ed9ng v\u00e0 ph\u00e9p tr\u1eeb th\u00e0nh m\u1ed9t d\u00e3y c\u00e1c ph\u00e9p c\u1ed9ng.<\/p>\n\n\n\n<p>T\u1eeb \u0111\u00f3, r\u00fat ra \u0111\u01b0\u1ee3c nh\u1eadn x\u00e9t: M\u1ed9t d\u00e3y c\u00e1c ph\u00e9p t\u00ednh bao g\u1ed3m c\u00e1c ph\u00e9p c\u1ed9ng v\u00e0 ph\u00e9p tr\u1eeb gi\u1eefa c\u00e1c s\u1ed1 nguy\u00ean \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 m\u1ed9t t\u1ed5ng \u0111\u1ea1i s\u1ed1.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5: a + b \u2013 c -d \u2013 e= a + b + (-c) + (-d) + (-e)<\/p>\n\n\n\n<p>Nh\u01b0 v\u1eady, ta c\u0169ng c\u00f3 th\u1ec3 vi\u1ebft g\u1ecdn c\u00e1c ph\u00e9p t\u00ednh trong tr\u01b0\u1eddng h\u1ee3p: M\u1ed9t t\u1ed5ng \u0111\u1ea1i s\u1ed1, sau khi chuy\u1ec3n c\u00e1c ph\u00e9p tr\u1eeb tr\u1edf th\u00e0nh ph\u00e9p c\u1ed9ng v\u1edbi s\u1ed1 \u0111\u1ed1i c\u1ee7a s\u1ed1 \u0111\u00f3. Ta c\u00f3 th\u1ec3 vi\u1ebft th\u00e0nh m\u1ed9t ph\u00e9p t\u00ednh \u0111\u1ea1i s\u1ed1 g\u1ecdn h\u01a1n. B\u1eb1ng c\u00e1ch b\u1ecf t\u1ea5t c\u1ea3 d\u1ea5u c\u1ee7a ph\u00e9p c\u1ed9ng v\u00e0 d\u1ea5u ngo\u1eb7c.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5: a + b + (-c) + (-d) + (-e) = a + b \u2013 c -d \u2013 e<\/p>\n\n\n\n<p>L\u00fd thuy\u1ebft v\u1ec1 t\u1ed5ng \u0111\u1ea1i s\u1ed1<\/p>\n\n\n\n<p>L\u01b0u \u00fd<\/p>\n\n\n\n<p>Trong m\u1ed9t t\u1ed5ng \u0111\u1ea1i s\u1ed1, c\u00f3 2 l\u01b0u \u00fd c\u1ea7n ch\u00fa \u00fd khi bi\u1ebfn \u0111\u1ed5i m\u1ed9t ph\u00e9p t\u00ednh:<\/p>\n\n\n\n<p>C\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y \u00fd v\u1ecb tr\u00ed c\u00e1c s\u1ed1 h\u1ea1ng trong t\u1ed5ng \u0111\u1ea1i s\u1ed1. L\u01b0u \u00fd: C\u1ea7n thay \u0111\u1ed5i s\u1ed1 h\u1ea1ng k\u00e8m d\u1ea5u c\u1ee7a s\u1ed1 h\u1ea1ng \u0111\u00f3.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5: a \u2013 b + c + d \u2013 e = a +c \u2013 e + d \u2013 b<\/p>\n\n\n\n<p>C\u00f3 th\u1ec3 th\u1ea5y trong v\u00ed d\u1ee5 tr\u00ean, ta thay \u0111\u1ed5i v\u1ecb tr\u00ed c\u1ee7a c\u00e1c s\u1ed1 h\u1ea1ng b, c, d, e. B\u00ean c\u1ea1nh \u0111\u00f3, c\u00e1c s\u1ed1 h\u1ea1ng thay \u0111\u1ed5i v\u1ecb tr\u00ed k\u00e9o theo d\u1ea5u c\u1ee7a s\u1ed1 h\u1ea1ng \u0111\u00f3 thay \u0111\u1ed5i v\u1ecb tr\u00ed theo. C\u1ee5 th\u1ec3: c, d v\u1eabn gi\u1eef nguy\u00ean d\u1ea5u +, b, e di chuy\u1ec3n k\u00e8m d\u1ea5u l\u00e0 \u201c-e\u201d, \u201c-b\u201d.<\/p>\n\n\n\n<p>L\u01b0u \u00fd quy t\u1eafc d\u1ea5u ngo\u1eb7c<\/p>\n\n\n\n<p>C\u00f3 th\u1ec3 nh\u00f3m s\u1ed1 c\u00e1c s\u1ed1 h\u1ea1ng m\u1ed9t c\u00e1ch t\u00f9y \u00fd. Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd: n\u1ebfu \u0111\u1eb7t tr\u01b0\u1edbc d\u1ea5u ngo\u1eb7c l\u00e0 d\u1ea5u \u201c -\u201d, c\u1ea7n \u0111\u1ed5i d\u1ea5u t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 h\u1ea1ng trong ngo\u1eb7c.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5 v\u1edbi ph\u00e9p t\u00ednh: a \u2013 b \u2013 c +d + e<\/p>\n\n\n\n<p>Ta c\u00f3 th\u1ec3 t\u00f9y \u00fd nh\u00f3m c\u00e1c s\u1ed1 h\u1ea1ng trong t\u1ed5ng \u0111\u1ea1i s\u1ed1. C\u00f3 2 tr\u01b0\u1eddng h\u1ee3p c\u00f3 th\u1ec3 x\u1ea3y ra<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Tr\u01b0\u1edbc d\u1ea5u ngo\u1eb7c l\u00e0 d\u1ea5u \u201c+\u201d (khi nh\u00f3m, ta gi\u1eef nguy\u00ean d\u1ea5u t\u1ea5t c\u1ea3 h\u1ea1ng t\u1eed):<\/li><\/ul>\n\n\n\n<p>a \u2013 b + (-c +d + e)<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Tr\u01b0\u1edbc d\u1ea5u ngo\u1eb7c l\u00e0 d\u1ea5u \u201c-\u201d (khi nh\u00f3m, ta \u0111\u1ed5i d\u1ea5u t\u1ea5t c\u1ea3 h\u1ea1ng t\u1eed trong d\u1ea5u ngo\u1eb7c):<\/li><\/ul>\n\n\n\n<p>a \u2013 (b +c \u2013 d \u2013 e)<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp quy t\u1eafc d\u1ea5u ngo\u1eb7c, s\u00e1ch gi\u00e1o khoa l\u1edbp 6<\/p>\n\n\n\n<p>B\u00e0i 57 (trang 85 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp quy t\u1eafc d\u1ea5u ngo\u1eb7c, s\u00e1ch gi\u00e1o khoa l\u1edbp 6<\/p>\n\n\n\n<p>B\u00e0i 58 (trang 85 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp quy t\u1eafc d\u1ea5u ngo\u1eb7c, s\u00e1ch gi\u00e1o khoa l\u1edbp 6<\/p>\n\n\n\n<p>B\u00e0i 59 (trang 85 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp quy t\u1eafc d\u1ea5u ngo\u1eb7c, s\u00e1ch gi\u00e1o khoa l\u1edbp 6<\/p>\n\n\n\n<p>B\u00e0i 60 (trang 85 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp quy t\u1eafc d\u1ea5u ngo\u1eb7c, s\u00e1ch gi\u00e1o khoa l\u1edbp 6<\/p>\n\n\n\n<p>B\u00ed quy\u1ebft c\u0103n b\u1ea3n \u0111\u1ec3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c to\u00e1n h\u1ecdc ngay trong ti\u1ebft h\u1ecdc \u1edf tr\u01b0\u1eddng<\/p>\n\n\n\n<p>C\u00f3 l\u1ebd, b\u00ed quy\u1ebft n\u00e0y kh\u00f4ng c\u00f2n xa l\u1ea1 g\u00ec v\u1edbi c\u00e1c b\u1ea1n. Mu\u1ed1n n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c ngay t\u1ea1i tr\u01b0\u1eddng, \u0111i\u1ec1u c\u01a1 b\u1ea3n nh\u1ea5t c\u1ea7n l\u00e0m \u0111\u00f3 l\u00e0: chu\u1ea9n b\u1ecb b\u00e0i tr\u01b0\u1edbc \u1edf nh\u00e0.<\/p>\n\n\n\n<p>Chu\u1ea9n b\u1ecb b\u00e0i tr\u01b0\u1edbc \u1edf nh\u00e0 n\u00ean b\u1eaft \u0111\u1ea7u t\u1eeb b\u01b0\u1edbc \u00f4n luy\u1ec7n l\u1ea1i b\u00e0i c\u0169. Tr\u01b0\u1edbc ti\u00ean, c\u00e1c con c\u1ea7n h\u1ecdc v\u00e0 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft v\u1ec1 c\u00e1c c\u00f4ng th\u1ee9c, t\u00ednh ch\u1ea5t, \u0111\u1ecbnh ngh\u0129a, \u2026 Nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y th\u01b0\u1eddng b\u1ecb b\u1ecf qua v\u00ec theo ph\u1ea7n \u0111\u00f4ng quan ni\u1ec7m hi\u1ec7n t\u1ea1i, to\u00e1n kh\u00f4ng ph\u1ea3i l\u00e0 m\u00f4n h\u1ecdc thu\u1ed9c. Tuy nhi\u00ean, n\u1ebfu kh\u00f4ng n\u1eafm v\u1eefng l\u00fd thuy\u1ebft, ph\u1ea7n gi\u1ea3i b\u00e0i t\u1eadp s\u1ebd tr\u1edf n\u00ean kh\u00f3 kh\u0103n. Th\u1eadm ch\u00ed, kh\u00f4ng th\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp c\u0103n b\u1ea3n.<\/p>\n\n\n\n<p>B\u01b0\u1edbc th\u1ee9 2 c\u1ee7a chu\u1ea9n b\u1ecb b\u00e0i \u1edf nh\u00e0 l\u00e0 \u0111\u1ecdc b\u00e0i m\u1edbi. Chu\u1ea9n b\u1ecb tr\u01b0\u1edbc cho nh\u1eefng ti\u1ebft h\u1ecdc tr\u00ean l\u1edbp s\u1ebd gi\u00fap c\u00e1c con t\u1ef1 tin h\u01a1n. C\u00f3 th\u1ec3 n\u0103ng n\u1ed5 h\u01a1n trong vi\u1ec7c x\u00e2y d\u1ef1ng b\u00e0i m\u1edbi.<\/p>\n\n\n\n<p>B\u00ed quy\u1ebft c\u0103n b\u1ea3n \u0111\u1ec3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c to\u00e1n h\u1ecdc ngay trong ti\u1ebft h\u1ecdc \u1edf tr\u01b0\u1eddng<\/p>\n\n\n\n<p>M\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> hi\u1ec7u qu\u1ea3<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi b\u00e0i t\u1eadp v\u1ec1 ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean n\u00f3i ri\u00eang v\u00e0 c\u00e1c b\u00e0i t\u1eadp to\u00e1n l\u1edbp 6 n\u00f3i chung. V\u1ea5n \u0111\u1ec1 th\u01b0\u1eddng g\u1eb7p nh\u1ea5t v\u00e0 s\u1ef1 nh\u1ea7m l\u1eabn trong quy tr\u00ecnh gi\u1ea3i b\u00e0i t\u1eadp. \u0110\u1ec3 kh\u1eafc ph\u1ee5c nh\u1eefng sai l\u1ea7m trong qu\u00e1 tr\u00ecnh h\u1ecdc. <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">H\u1ecdc sinh<\/a> c\u1ea7n coi tr\u1ecdng vi\u1ec7c ghi nh\u1edb ki\u1ebfn th\u1ee9c.<\/p>\n\n\n\n<p>B\u1eaft \u0111\u1ea7u t\u1eeb vi\u1ec7c nh\u1edb c\u00e1c nguy\u00ean t\u1eafc \u0111\u1ecbnh l\u00fd, \u0111\u1ecbnh ngh\u0129a,\u2026 \u0111\u1ebfn c\u00e1c b\u01b0\u1edbc gi\u1ea3i v\u00e0 ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1. \u0110\u1ec3 c\u00f3 th\u1ec3 l\u00e0m t\u1ed1t nhi\u1ec7m v\u1ee5 ghi nh\u1edb, Vietlearn t\u1ed5ng h\u1ee3p v\u00e0 gi\u1edbi thi\u1ec7u cho c\u00e1c em h\u1ecdc sinh 4 b\u01b0\u1edbc \u0111\u1ec3 ghi nh\u1edb. N\u1ebfu \u00e1p d\u1ee5ng t\u1ed1t, c\u00e1c em c\u00f3 th\u1ec3 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> hi\u1ec7u qu\u1ea3. H\u1ea1n ch\u1ebf sai l\u1ea7m v\u00e0 c\u00f3 m\u1ed9t n\u1ec1n t\u1ea3ng ki\u1ebfn th\u1ee9c v\u1eefng ch\u1eafc.<\/p>\n\n\n\n<p>T\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft. Tr\u00ecnh b\u00e0y l\u1ea1i theo d\u1ea1ng s\u01a1 \u0111\u1ed3, d\u00e0n \u00fd<\/p>\n\n\n\n<p>\u0110\u1ea7u ti\u00ean, mu\u1ed1n ghi nh\u1edb \u0111\u01b0\u1ee3c m\u1ed9t v\u1ea5n \u0111\u1ec1 \u0111\u1ec3 c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng trong th\u1ef1c t\u1ebf. Ta c\u1ea7n ph\u1ea3i hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t c\u1ee7a l\u00fd thuy\u1ebft. H\u1ecdc sinh n\u00ean \u0111\u1ecdc l\u1ea1i l\u00fd thuy\u1ebft v\u00e0 ti\u1ebfn h\u00e0nh t\u1ed5ng h\u1ee3p.<\/p>\n\n\n\n<p>\u0110\u1ecdc l\u1ea1i b\u00e0i h\u1ecdc t\u1eeb 2 \u0111\u1ebfn 3 l\u1ea7n, v\u00e0 t\u00f3m t\u1eaft th\u00e0nh c\u00e1c \u0111\u1ea7u m\u1ee5c l\u1edbn, nh\u1ecf,.. s\u1eafp x\u1ebfp theo th\u1ee9 t\u1ef1 gi\u1ea3m d\u1ea7n. Sau \u0111\u00f3 tr\u00ecnh b\u00e0y l\u1ea1i ki\u1ebfn th\u1ee9c \u0111\u00e3 t\u00f3m t\u1eaft d\u01b0\u1edbi d\u1ea1ng b\u1ea3ng bi\u1ec3u, s\u01a1 \u0111\u1ed3.<\/p>\n\n\n\n<p>V\u00ec sao n\u00ean tr\u00ecnh b\u00e0y l\u1ea1i l\u00fd thuy\u1ebft d\u01b0\u1edbi d\u1ea1ng s\u01a1 \u0111\u1ed3? Theo nh\u01b0 nghi\u00ean c\u1ee9u c\u1ee7a c\u00e1c nh\u00e0 khoa h\u1ecdc, s\u01a1 \u0111\u1ed3 t\u01b0 duy l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c ghi ch\u00e9p. C\u00f3 kh\u1ea3 n\u0103ng k\u00edch th\u00edch t\u1ed1i \u0111a s\u1ef1 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00e3o b\u1ed9. Kh\u00e1c ho\u00e0n to\u00e0n v\u1edbi nh\u1eefng th\u00f4ng tin \u0111\u01b0\u1ee3c ghi b\u1eb1ng h\u1ec7 th\u1ed1ng ng\u00f4n ng\u1eef, k\u00fd t\u1ef1, \u0111\u01b0\u1eddng th\u1eb3ng, \u2026 N\u1ebfu s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 t\u01b0 duy, bu\u1ed9c ph\u1ea3i k\u1ebft h\u1ee3p v\u1eadn d\u1ee5ng c\u00e1c th\u00f4ng tin s\u00e1ng t\u1ea1o h\u01a1n. Nh\u01b0 m\u00e0u s\u1eafc, s\u1ef1 s\u00e1ng t\u1ea1o, s\u1eed d\u1ee5ng kh\u00f4ng gian,\u2026 Nh\u01b0 v\u1eady, n\u00e3o s\u1ebd ph\u1ea3i s\u1eed d\u1ee5ng nh\u1eefng k\u1ef9 n\u0103ng t\u1eeb c\u1ea3 n\u00e3o ph\u1ea3i v\u00e0 n\u00e3o tr\u00e1i. Nh\u01b0 v\u1eady, kh\u1ea3 n\u0103ng ghi nh\u1eadn th\u00f4ng tin \u0111\u01b0\u1ee3c n\u00e2ng l\u00ean t\u1ed1i \u0111a nh\u1ea5t.<\/p>\n\n\n\n<p>\u00d4n luy\u1ec7n, c\u1ee7ng c\u1ed1 l\u1ea1i ki\u1ebfn th\u1ee9c<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi h\u1ecdc t\u1eadp, vi\u1ec7c \u00f4n luy\u1ec7n l\u1ea1i v\u00e0 c\u1ee7ng c\u1ed1 th\u00eam ki\u1ebfn th\u1ee9c l\u00e0 v\u00f4 c\u00f9ng c\u1ea7n thi\u1ebft. Nh\u1ea5t l\u00e0 \u0111\u1ed1i v\u1edbi h\u1ecdc sinh l\u1edbp 6 v\u00e0 d\u1ea1ng b\u00e0i t\u1eadp ph\u00e9p tr\u1eeb hai s\u1ed1 nguy\u00ean. N\u00ean tr\u00e1nh nh\u1eefng t\u01b0 duy nh\u01b0 ch\u1ec9 h\u1ecdc thu\u1ed9c l\u00fd thuy\u1ebft. Hay ch\u1ec9 ch\u0103m ch\u0103m v\u00e0o nh\u1eefng \u0111i\u1ec1u b\u1ea3n th\u00e2n \u0111\u00e3 t\u1ed5ng h\u1ee3p tr\u01b0\u1edbc \u0111\u00e2y.<\/p>\n\n\n\n<p>Vi\u1ec7c h\u1ecdc l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh d\u00e0i, b\u1edfi th\u1ebf, c\u1ea7n t\u0103ng c\u01b0\u1eddng \u00f4n luy\u1ec7n. C\u00f3 th\u1ec3 luy\u1ec7n b\u1eb1ng c\u00e1ch h\u1ecdc l\u1ea1i l\u00fd thuy\u1ebft hay l\u00e0m c\u00e1c b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh. T\u1eeb \u0111\u00f3, c\u1ee7ng c\u1ed1 th\u00eam c\u00e1c ki\u1ebfn th\u1ee9c kh\u00e1c v\u1ec1 c\u00f9ng ch\u1ee7 \u0111\u1ec1 b\u1ea3n th\u00e2n \u0111ang h\u1ecdc.<\/p>\n\n\n\n<p>L\u1eddi k\u1ebft<\/p>\n\n\n\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 t\u1ed5ng h\u1ee3p l\u00fd thuy\u1ebft v\u00e0 h\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp ch\u1ee7 \u0111\u1ec1 quy t\u1eafc d\u1ea5u ngo\u1eb7c cho c\u00e1c em h\u1ecdc sinh l\u1edbp 6. B\u00ean c\u1ea1nh \u0111\u00f3, Vietlearn c\u0169ng \u0111\u01b0a ra 1 b\u00ed quy\u1ebft nh\u1ecf gi\u00fap c\u00e1c con t\u1eadp trung t\u1ed1t h\u01a1n, n\u00e2ng cao n\u0103ng l\u1ef1c h\u1ecdc to\u00e1n. \u0110\u1ec3 bi\u1ebft th\u00eam nhi\u1ec1u b\u00ed quy\u1ebft h\u01a1n. M\u1eddi ph\u1ee5 huynh v\u00e0 c\u00e1c con tham kh\u1ea3o th\u00eam c\u00e1c b\u00e0i vi\u1ebft kh\u00e1c c\u1ee7a Vietlearn trong m\u1ee5c to\u00e1n h\u1ecdc l\u1edbp 6 nh\u00e9! Ch\u00fac c\u00e1c con h\u1ecdc t\u1ed1t ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n l\u1edbp 6!<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u \u2013 to\u00e1n l\u1edbp 6. C\u00f9ng tr\u1ebb vui h\u1ecdc<\/p>\n\n\n\n<p>Quy t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u \u2013 chinh ph\u1ee5c to\u00e1n l\u1edbp<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Quy t\u1eafc d\u1ea5u ngo\u1eb7c trong ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc l\u1edbp 6 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t b\u00e0i gi\u1ea3ng g\u00f3p ph\u1ea7n c\u1ee7ng c\u1ed1. V\u00e0 m\u1edf r\u1ed9ng c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc. Nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c h\u1ecdc v\u00e0 nh\u1edb xuy\u00ean su\u1ed1t qu\u00e1 tr\u00ecnh h\u1ecdc to\u00e1n. Kh\u00f4ng [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[9,4],"tags":[],"class_list":["post-2719","post","type-post","status-publish","format-standard","hentry","category-toan-hoc","category-trung-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2719","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=2719"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2719\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=2719"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=2719"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=2719"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}