{"id":907,"date":"2021-10-07T23:41:41","date_gmt":"2021-10-07T23:41:41","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=907"},"modified":"2021-10-14T22:10:41","modified_gmt":"2021-10-14T15:10:41","slug":"cach-chia-da-thuc-cho-don-thuc-hoc-tot-toan-cung-toppy","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/cach-chia-da-thuc-cho-don-thuc-hoc-tot-toan-cung-toppy\/","title":{"rendered":"C\u00e1ch chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c \u2013 h\u1ecdc t\u1ed1t to\u00e1n"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u1eefng b\u00e0i h\u1ecdc c\u1ee7a <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n<\/a> \u0111\u1ea1i s\u1ed1 l\u1edbp 8 \u0111\u1ea7u ti\u00ean ch\u00fang ta t\u00ecm hi\u1ec3u v\u1ec1 \u0111a th\u1ee9c, \u0111\u01a1n th\u1ee9c v\u00e0 nh\u1eefng ph\u00e9p t\u00ednh li\u00ean quan \u0111\u1ebfn ch\u00fang. B\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 b\u00e0i t\u1eadp v\u00e0 l\u00fd thuy\u1ebft c\u1ee7a ph\u1ea7n chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c. C\u00f9ng ch\u00fang t\u00f4i t\u00ecm hi\u1ec3u \u0111\u1ec3 gi\u00fap b\u1ea1n c\u00f3 m\u1ed9t k\u1ebft qu\u1ea3 <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> cao nh\u1ea5t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u00fd thuy\u1ebft v\u1ec1 c\u00e1c chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 n\u1eafm v\u1eefng \u0111\u01b0\u1ee3c l\u00fd thuy\u1ebft v\u1ec1 c\u00e1ch chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c c\u00e1c b\u1ea1n s\u1ebd c\u1ea7n ph\u1ea3i hi\u1ec3u r\u00f5 \u0111\u01b0\u1ee3c quy t\u1eafc v\u00e0 ch\u00fa \u00fd khi th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh n\u00e0y, sao cho c\u00f3 c\u00e1ch gi\u1ea3i ch\u00ednh x\u00e1c v\u00e0 nhanh nh\u1ea5t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A l\u00e0 \u0111a th\u1ee9c, B l\u00e0 \u0111\u01a1n th\u1ee9c, \u0111i\u1ec1u ki\u1ec7n B#0. A s\u1ebd chia h\u1ebft cho B n\u1ebfu ch\u00fang ta t\u00ecm \u0111\u01b0\u1ee3c m\u1ed9t bi\u1ec3u th\u1ee9c g\u1ecdi l\u00e0 Q ( Q \u1edf \u0111\u00e2y c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t \u0111\u01a1n th\u1ee9c ho\u1eb7c \u0111a th\u1ee9c), sao cho A= B.Q.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A: ch\u00ednh l\u00e0 \u0111a th\u1ee9c b\u1ecb chia<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B: l\u00e0 \u0111\u01a1n th\u1ee9c chia<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q: l\u00e0 th\u01b0\u01a1ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Q= A : B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quy t\u1eafc<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mu\u1ed1n chia m\u1ed9t \u0111a th\u1ee9c A cho m\u1ed9t \u0111\u01a1n th\u1ee9c B ( trong tr\u01b0\u1eddng h\u1ee3p c\u00e1c h\u1ea1ng t\u1eed trong \u0111a th\u1ee9c A \u0111\u1ec1u c\u00f9ng chia h\u1ebft cho \u0111\u01a1n th\u1ee9c B), th\u00ec ch\u00fang ta s\u1ebd chia t\u1eebng h\u1ea1ng t\u1eed c\u1ee7a A cho B sau \u0111\u00f3 c\u1ed9ng k\u1ebft qu\u1ea3 l\u1ea1i v\u1edbi nhau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u00fa \u00fd: trong khi l\u00e0m b\u00e0i to\u00e1n 8 chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c ch\u00fang ta c\u00f3 th\u1ec3 t\u00ednh nh\u1ea9m v\u00e0 b\u1ecf \u0111i nh\u1eefng ph\u00e9p t\u00ednh trung gian.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p> Chia \u0111\u01a1n th\u1ee9c cho \u0111\u01a1n th\u1ee9c<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00ed quy\u1ebft \u0111\u1ec3 h\u1ecdc to\u00e1n hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u1ea1t th\u00e0nh t\u00edch t\u1ed1t<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To\u00e1n h\u1ecdc l\u00e0 m\u1ed9t m\u00f4n h\u1ecdc t\u1ef1 nhi\u00ean c\u1ea7n n\u1eafm ch\u1eafc t\u1ea5t c\u1ea3 c\u00e1c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<\/a> \u0111\u1ec3 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng v\u00e0o gi\u1ea3i c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp kh\u00e1c nhau. V\u00ec v\u1eady, \u0111\u1ec3 h\u1ecdc t\u1ed1t to\u00e1n c\u0169ng c\u1ea7n nh\u1eefng b\u00ed quy\u1ebft ri\u00eang:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Luy\u1ec7n l\u00fd thuy\u1ebft<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t ti\u1ebft h\u1ecdc c\u1ee7a ch\u00fang ta ch\u1ec9 v\u1ecfn v\u1eb9n trong v\u00f2ng 45 ph\u00fat. C\u00e1c b\u1ea1n th\u01b0\u1eddng hay ch\u1ec9 ghi l\u1ea1i nh\u1eefng g\u00ec th\u1ea7y c\u00f4 ghi tr\u00ean b\u1ea3ng. Tuy nhi\u00ean, nh\u1eefng c\u00e1ch gi\u1ea3i hay th\u01b0\u1eddng gi\u00e1 vi\u00ean s\u1ebd kh\u00f4ng ghi m\u00e0 ch\u1ec9 gi\u1ea3ng \u0111\u1ec3 nghe. V\u00ec v\u1eady, b\u1ea1n c\u1ea7n ch\u00fa \u00fd nghe v\u00e0 ghi ch\u00e9p ra v\u1edf nh\u1eefng th\u00f4ng tin c\u1ea7n thi\u1ebft \u0111\u1ec3 gi\u1ea3i b\u00e0i t\u1eadp.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec1u b\u1ea1n l\u1ea1i cho r\u1eb1ng l\u00fd thuy\u1ebft kh\u00f4ng quan tr\u1ecdng. Tuy nhi\u00ean, n\u1ebfu nh\u01b0 b\u1ea1n kh\u00f4ng n\u1eafm v\u1eefng l\u00fd thuy\u1ebft th\u00ec b\u1ea1n s\u1ebd g\u1eb7p kh\u00f3 kh\u0103n khi gi\u1ea3i nh\u1eefng b\u00e0i to\u00e1n b\u1ecb bi\u1ebfn t\u1ea5u \u0111i. B\u1ea1n s\u1ebd ch\u1ec9 gi\u1ea3i \u0111\u01b0\u1ee3c nh\u1eefng b\u00e0i to\u00e1n \u0111\u01a1n gi\u1ea3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00ed quy\u1ebft \u0111\u1ec3 h\u1ecdc t\u1ed1t to\u00e1n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Luy\u1ec7n b\u00e0i t\u1eadp<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i h\u1ecdc l\u00fd thuy\u1ebft \u1edf tr\u00ean l\u1edbp th\u00ec b\u1ea1n c\u1ea7n luy\u1ec7n t\u1eadp nhi\u1ec1u. M\u1ed7i d\u1ea1ng b\u00e0i t\u1eadp b\u1ea1n n\u00ean l\u00e0m quen v\u1edbi nhi\u1ec1u c\u00e1ch gi\u1ea3i v\u00e0 l\u00e0m th\u00e0nh th\u1ea1o. Khi th\u1ef1c h\u00e0nh nhi\u1ec1u b\u1ea1n s\u1ebd r\u00fat ra cho m\u00ecnh \u0111\u01b0\u1ee3c nhi\u1ec1u kinh nghi\u1ec7m h\u01a1n khi g\u1eb7p nh\u1eefng b\u00e0i t\u01b0\u01a1ng t\u1ef1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ea7u ti\u00ean b\u1ea1n n\u00ean gi\u1ea3i nh\u1eefng d\u1ea1ng b\u00e0i c\u01a1 b\u1ea3n Khi th\u00e0nh th\u1ea1o s\u1ebd ti\u1ebfp c\u1eadn b\u00e0i kh\u00f3 h\u01a1n. Vi\u1ec7c n\u00e0y s\u1ebd gi\u00fap b\u1ea1n t\u1ea1o \u0111\u01b0\u1ee3c th\u00f3i quen m\u00e0 kh\u00f4ng s\u1ee3 m\u00f4n h\u1ecdc n\u00e0y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 gi\u1ea3i \u0111\u01b0\u1ee3c m\u1ed9t b\u00e0i to\u00e1n nhanh nh\u1ea5t th\u00ec vi\u1ec7c t\u00f3m t\u1eaft \u0111\u1ec1 b\u00e0i s\u1ebd gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c th\u1eddi gian v\u00e0 kh\u00f4ng b\u1ecf s\u00f3t d\u1eef li\u1ec7u c\u1ee7a b\u00e0i to\u00e1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n \u0111\u1eebng bao gi\u1edd ngh\u0129 r\u1eb1ng m\u1ed9t b\u00e0i to\u00e1n ch\u1ec9 c\u00f3 m\u1ed9t c\u00e1ch gi\u1ea3i m\u00e0 h\u00e3y th\u1eed v\u1edbi nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p kh\u00e1c. Ch\u00fang s\u1ebd gi\u00fap b\u1ea1n c\u00f3 th\u00eam kinh nghi\u1ec7m v\u00e0 t\u00ecm \u0111\u01b0\u1ee3c m\u1ed9t h\u01b0\u1edbng gi\u1ea3i ph\u00f9 h\u1ee3p cho t\u1eebng d\u1ea1ng to\u00e1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi ho\u00e0n th\u00e0nh xong m\u1ed9t b\u00e0i t\u1eadp, vi\u1ec7c c\u1ee7a b\u1ea1n l\u00e0 xem l\u1ea1i c\u00e1ch gi\u1ea3i c\u1ee7a m\u00ecnh \u0111\u00e3 ph\u00f9 h\u1ee3p ch\u01b0a, c\u00e1ch nh\u1eadn bi\u1ebft d\u1ea1ng b\u00e0i nh\u01b0 th\u1ebf n\u00e0o. Nh\u1eefng \u0111i\u1ec1u \u0111\u00f3 c\u1ea7n \u0111\u01b0\u1ee3c ghi ch\u00fa l\u1ea1i \u0111\u1ec3 d\u1ec5 nh\u1edb nh\u1ea5t. R\u00fat ra \u0111\u01b0\u1ee3c b\u00e0i h\u1ecdc cho ri\u00eang m\u00ecnh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c c\u00f3 r\u1ea5t nhi\u1ec1u d\u1ea1ng b\u00e0i t\u1eadp kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp \u0111i\u1ec3n h\u00ecnh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 1: Kh\u00f4ng c\u1ea7n l\u00e0m ph\u00e9p t\u00ednh chia, h\u00e3y cho bi\u1ebft \u0111a th\u1ee9c A c\u00f3 chia \u0111\u01b0\u1ee3c cho \u0111\u01a1n th\u1ee9c B hay kh\u00f4ng?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A = 15xy2 + 17xy3 + 18y2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B = 6y2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110a th\u1ee9c A c\u00f3 chia h\u1ebft cho \u0111\u01a1n th\u1ee9c B b\u1edfi v\u00ec \u1edf A m\u1ed7i h\u1ea1ng t\u1eed \u0111\u1ec1u chia h\u1ebft cho B.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 2: Th\u1ef1c hi\u1ec7n ph\u00e9p t\u00ednh chia \u0111a th\u1ee9c v\u1edbi \u0111\u01a1n th\u1ee9c:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a) (-2&#215;5 + 3&#215;2 \u2013 4&#215;3) : 2&#215;2;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b) (x3 \u2013 2x2y + 3xy2) : (-1\/2x);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">c) (3x2y2 + 6x2y3 \u2013 12xy) : 3xy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e1p \u00e1n v\u00e0 h\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a) (-2&#215;5 + 3&#215;2 \u2013 4&#215;3) : 2&#215;2 = (-2\/2)x5 \u2013 2 + 3\/2&#215;2 \u2013 2 + (-4\/2)x3 \u2013 2 = \u2013 x3 + 3\/2 \u2013 2x.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b) (x3 \u2013 2x2y + 3xy2) : (-1\/2x) = (x3 : \u2013 1\/2x) + (-2x2y : \u2013 1\/2x) + (3xy2 : \u2013 1\/2x) = -2&#215;2+ 4xy \u2013 6y2 = -2x(x + 2y + 3y2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">c) (3x2y2 + 6x2y3 \u2013 12xy) : 3xy = (3x2y2 : 3xy) + (6x2y2 : 3xy) + (-12xy : 3xy) = xy + 2xy2 \u2013 4.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 3: Ai sai, ai \u0111\u00fang?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi gi\u1ea3i b\u00e0i to\u00e1n chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c: \u201c b\u1ea1n h\u00e3y cho bi\u1ebft \u0111a th\u1ee9c A= 5&#215;4 \u2013 4&#215;3 + 6x2y chia h\u1ebft cho \u0111\u01a1n th\u1ee9c B = 2&#215;2 kh\u00f4ng?\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ee9c tr\u1ea3 l\u1eddi: \u201cA s\u1ebd kh\u00f4ng chia h\u1ebft cho B v\u00ec 5 \u1edf \u0111a th\u1ee9c A th\u00ec kh\u00f4ng chia h\u1ebft cho 2 \u1edf \u0111\u01a1n th\u1ee9c B\u201d<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lan tr\u1ea3 l\u1eddi: \u201cA c\u00f3 chia h\u1ebft cho B v\u00ec m\u1ecdi h\u1ea1ng t\u1eed c\u1ee7a A \u0111\u1ec1u chia h\u1ebft cho h\u1ea1ng t\u1eed \u1edf B\u201d.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Theo b\u1ea1n \u0110\u1ee9c v\u00e0 Lan b\u1ea1n n\u00e0o tr\u1ea3 l\u1eddi \u0111\u00fang?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e1p \u00e1n v\u00e0 h\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ta c\u00f3: A : B = (5&#215;4 \u2013 4&#215;3 + 6x2y) : 2&#215;2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= (5&#215;2 : 2&#215;2) + (\u2013 4&#215;3 : 2&#215;2) + (6x2y : 2&#215;2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= 5\/2&#215;2 \u2013 2x + 3y<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1eady A c\u00f3 chia h\u1ebft cho B v\u00ec c\u00e1c h\u1ea1ng t\u1eed c\u1ee7a A \u0111\u1ec1u chia h\u1ebft cho h\u1ea1ng t\u1eed c\u1ee7a B.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1eady: Lan tr\u1ea3 l\u1eddi \u0111\u00fang, \u0110\u1ee9c tr\u1ea3 l\u1eddi sai.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 4: Th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e9p t\u00ednh:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a, (7.35 \u2013 34 + 36) : 34<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b, (163 \u2013 642) : 83<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a, (7.35 \u2013 34 + 36) : 34<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= (7.35 : 34) + (\u2013 34 : 34)+ (36 : 34)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= 7.3 \u2013 1 + 32<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= 21 \u2013 1 + 9 = 29<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b, (163 \u2013 642) : 83<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= [(2.8)3 \u2013 (82)2] : 83<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= (23.83 \u2013 84) : 83<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= (23.83 : 83) + (- 84 : 83)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= 23 \u2013 8 = 8 \u2013 8 = 0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 5: Th\u1ef1c hi\u1ec7n nh\u1eefng ph\u00e9p t\u00ednh sau, b\u00e0i chia \u0111\u01a1n th\u1ee9c cho \u0111a th\u1ee9c:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a, (5&#215;4 \u2013 3&#215;3 + x2) : 3&#215;2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b, (5xy2 + 9xy \u2013 x2y2) : (- xy)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">c, (x3y3 \u2013 1\/2 x2y3 \u2013 x3y2) : 1\/3 x2y2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a, (5&#215;4 \u2013 3&#215;3 + x2) : 3&#215;2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= (5&#215;4 : 3&#215;2) + (\u2013 3&#215;3 : 3&#215;2 ) + (x2 : 3&#215;2) = 5\/3 x2 \u2013 x + 1\/3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b, (5xy2 + 9xy \u2013 x2y2) : (- xy)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= [5xy2 : (- xy)] + [9xy : (- xy)] + [(- x2y2) : (- xy)] = \u2013 5y \u2013 9 + xy<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">c, (x3y3 \u2013 1\/2 x2y3 \u2013 x3y2) : 1\/3 x2y2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= (x3y3 : 1\/3 x2y2) + (- 1\/2 x2y3 : 1\/3 x2y2) + (\u2013 x3y2 : 1\/3 x2y2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">= 3xy \u2013 3\/2 y \u2013 3x<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 6: T\u00ecm n \u0111\u1ec3 nh\u1eefng ph\u00e9p t\u00ednh sau l\u00e0 ph\u00e9p chia h\u1ebft (n l\u00e0 s\u1ed1 t\u1ef1 nhi\u00ean)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a, (5&#215;3 \u2013 7&#215;2 + x) : 3xn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b, (13x4y3 \u2013 5x3y3 + 6x2y2) : 5xnyn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">a, V\u00ec \u0111a th\u1ee9c (5&#215;3 \u2013 7&#215;2 + x) chia h\u1ebft cho 3xn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">n\u00ean h\u1ea1ng t\u1eed x chia h\u1ebft cho 3xn \u21d2 0 \u2264 n \u2264 1. V\u1eady n \u2208 {0; 1}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b, V\u00ec \u0111a th\u1ee9c (13x4y3 \u2013 5x3y3 + 6x2y2) chia h\u1ebft cho 5xnyn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">n\u00ean h\u1ea1ng t\u1eed 6x2y2 chia h\u1ebft cho 5xnyn \u21d2 0 \u2264 n \u2264 2. V\u1eady n \u2208 {0;1;2}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng l\u00fd thuy\u1ebft v\u00e0 b\u00e0i t\u1eadp v\u1ec1 chia \u0111a th\u1ee9c cho \u0111\u01a1n th\u1ee9c. N\u1ebfu b\u1ea1n c\u00f2n c\u00f3 c\u00e2u h\u1ecfi g\u00ec c\u1ea7n gi\u1ea3i \u0111\u00e1p hay mu\u1ed1n \u0111\u0103ng k\u00fd tham gia c\u00e1c kh\u00f3a h\u1ecdc th\u00ec c\u00f3 th\u1ec3 li\u00ean h\u1ec7 tr\u1ef1c ti\u1ebfp v\u1edbi ch\u00fang t\u00f4i th\u00f4ng qua s\u1ed1 Hotline: +84 96-6989-538 ho\u1eb7c t\u1ea1i \u0111\u1ecba ch\u1ec9 website: Vietlearn.org\/ \u0111\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3i \u0111\u00e1p m\u1ed9t c\u00e1ch t\u1eadn t\u00ecnh, chu \u0111\u00e1o nh\u1ea5t.\\<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ecm hi\u1ec3u th\u00eam:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chia \u0111a th\u1ee9c m\u1ed9t bi\u1ebfn \u0111\u00e3 s\u1eafp<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Nh\u1eefng b\u00e0i h\u1ecdc c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n \u0111\u1ea1i s\u1ed1 l\u1edbp 8 \u0111\u1ea7u ti\u00ean ch\u00fang ta t\u00ecm hi\u1ec3u v\u1ec1 \u0111a th\u1ee9c, \u0111\u01a1n th\u1ee9c v\u00e0 nh\u1eefng ph\u00e9p t\u00ednh li\u00ean quan \u0111\u1ebfn ch\u00fang. B\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 b\u00e0i t\u1eadp v\u00e0 l\u00fd thuy\u1ebft c\u1ee7a ph\u1ea7n chia [&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],"tags":[],"class_list":["post-907","post","type-post","status-publish","format-standard","hentry","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/907","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=907"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/907\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=907"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=907"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=907"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}