{"id":1099,"date":"2021-10-08T13:13:53","date_gmt":"2021-10-08T13:13:53","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=1099"},"modified":"2021-10-14T22:10:31","modified_gmt":"2021-10-14T15:10:31","slug":"he-hai-phuong-trinh-bac-nhat-hai-an-hoc-tot-toan-cung-toppy","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/he-hai-phuong-trinh-bac-nhat-hai-an-hoc-tot-toan-cung-toppy\/","title":{"rendered":"H\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n \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\">Trong n\u1ed9i dung ch\u01b0\u01a1ng tr\u00ecnh \u0110\u1ea1i s\u1ed1 l\u1edbp 9, c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c ti\u1ebfp x\u00fac v\u1edbi h\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n. N\u00f3 l\u00e0 b\u00e0i h\u1ecdc c\u1ea7n thi\u1ebft \u0111\u1ec3 c\u00e1c em \u00e1p d\u1ee5ng trong c\u00e1c b\u00e0i h\u1ecdc v\u1ec1 gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh. B\u00e0i vi\u1ebft h\u00f4m nay, Vietlearn s\u1ebd gi\u00fap c\u00e1c em n\u1eafm \u0111\u01b0\u1ee3c kh\u00e1i ni\u1ec7m, hi\u1ec3u \u0111\u01b0\u1ee3c t\u1eadp h\u1ee3p nghi\u1ec7m v\u00e0 quan tr\u1ecdng h\u01a1n l\u00e0 c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p nh\u1ea5t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00e1i ni\u1ec7m v\u1ec1 h\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n l\u00e0 h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3, ax+by=c v\u00e0 a\u2019x+b\u2019y=c l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n. \u0110\u1ec3 hi\u1ec3u ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t 2 \u1ea9n l\u00e0 g\u00ec, c\u00e1c em c\u1ea7n nh\u1edb l\u1ea1i ki\u1ebfn th\u1ee9c c\u1ee7a b\u00e0i h\u1ecdc tr\u01b0\u1edbc. N\u00f3 d\u1ea1ng ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 d\u1ea1ng ax + by = c, trong \u0111\u00f3 a,b,c l\u00e0 nh\u1eefng s\u1ed1 cho tr\u01b0\u1edbc a\u22600 ho\u1eb7c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">b \u22600.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong h\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh hai \u1ea9n n\u00e0y, n\u1ebfu c\u1ea3 hai ph\u01b0\u01a1ng tr\u00ecnh thu\u1ed9c h\u1ec7 c\u00f3 nghi\u1ec7m chung th\u00ec l\u00fac n\u00e0y nghi\u1ec7m chung t\u00ecm \u0111\u01b0\u1ee3c s\u1ebd l\u00e0 nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh. Tuy nhi\u00ean, c\u00e1c em c\u0169ng s\u1ebd g\u1eb7p tr\u01b0\u1eddng h\u1ee3p ch\u1eb3ng t\u00ecm \u0111\u01b0\u1ee3c nghi\u1ec7m n\u00e0o c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh c\u1ea3. L\u00fac n\u00e0y, ch\u00fang ta n\u00f3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh n\u00e0y v\u00f4 nghi\u1ec7m. N\u1ebfu h\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 c\u00f9ng t\u1eadp h\u1ee3p nghi\u1ec7m th\u00ec s\u1ebd c\u00f3 h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh c\u00f9ng t\u1eadp h\u1ee3p nghi\u1ec7m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi \u0111i gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh t\u1ee9c l\u00e0 ch\u00fang ta \u0111ang \u0111i t\u00ecm nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00f3. Th\u1ebf n\u00ean khi g\u1eb7p b\u00e0i gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh th\u00ec t\u1ee9c l\u00e0 \u0111ang y\u00eau c\u1ea7u c\u00e1c em \u0111i t\u00ecm nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh nh\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Minh h\u1ecda h\u00ecnh <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> nghi\u1ec7m c\u1ee7a h\u1ec7 2 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t 2 \u1ea9n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eadp nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n s\u1ebd \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1edfi c\u00e1c t\u1eadp h\u1ee3p \u0111i\u1ec3m chung c\u1ee7a hai \u0111\u01b0\u1eddng th\u1eb3ng sau: ax+by=c (d) v\u00e0 a\u2019x+b\u2019y=c (d\u2019).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u00fang ta c\u00f3 3 tr\u01b0\u1eddng h\u1ee3p x\u1ea3y ra, g\u1ed3m:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p 1: d \u2229 d\u2019 = A(x0, y0) t\u01b0\u01a1ng \u0111\u01b0\u01a1ng h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 nghi\u1ec7m duy nh\u1ea5t (x0;y0)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p 2: d\/\/d\u2019 th\u00ec h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh v\u00f4 nghi\u1ec7m v\u00e0 ng\u01b0\u1ee3c l\u1ea1i<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p 3: d=d\u2019 th\u00ec h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh c\u00f3 v\u00f4 s\u1ed1 nghi\u1ec7m v\u00e0 ng\u01b0\u1ee3c l\u1ea1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Minh h\u1ecda m\u00f4 h\u00ecnh <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t 2 \u1ea9n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1ch gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n s\u1ebd \u0111\u01b0\u1ee3c gi\u1ea3i b\u1eb1ng hai ph\u01b0\u01a1ng ph\u00e1p, c\u0169ng gi\u1ed1ng nh\u01b0 h\u1ec7 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n. Tr\u01b0\u1edbc ti\u00ean l\u00e0 gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p c\u1ed9ng \u0111\u1ea1i s\u1ed1, sau \u0111\u00f3 l\u00e0 ph\u01b0\u01a1ng ph\u00e1p th\u1ebf.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t 2 \u1ea9n b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p c\u1ed9ng \u0111\u1ea1i s\u1ed1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u01b0\u01a1ng ph\u00e1p th\u1ebf l\u00e0 ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. \u1ede ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, quy t\u1eafc \u0111\u01b0\u1ee3c \u0111\u01b0a ra l\u00e0 bi\u1ebfn \u0111\u1ed5i m\u1ed9t h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh th\u00e0nh h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh t\u01b0\u01a1ng \u0111\u01b0\u01a1ng. \u0110\u1ec3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c ph\u00e9p bi\u1ebfn \u0111\u1ed5i n\u00e0y, tr\u01b0\u1edbc ti\u00ean, c\u00e1c em c\u1ea7n c\u1ed9ng hay tr\u1eeb t\u1eebng v\u1ebf ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho \u0111\u1ec3 \u0111\u01b0\u1ee3c m\u1ed9t h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh hai \u1ea9n m\u1edbi. Sau \u0111\u00f3, h\u00e3y d\u00f9ng ph\u01b0\u01a1ng tr\u00ecnh m\u1edbi v\u1eeba ra \u0111\u01b0\u1ee3c thay th\u1ebf cho m\u1ed9t trong hai ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a h\u1ec7, nh\u1edb l\u00e0 gi\u1eef nguy\u00ean ph\u01b0\u01a1ng tr\u00ecnh c\u00f2n l\u1ea1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quy t\u1eafc n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u00fang th\u00ec c\u00e1c em m\u1edbi gi\u1ea3i \u0111\u01b0\u1ee3c b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p c\u1ed9ng \u0111\u1ea1i s\u1ed1 \u0111\u00fang. C\u00e1c em n\u00ean th\u1ef1c hi\u1ec7n b\u00e0i to\u00e1n b\u1eb1ng c\u00e1ch tr\u1ea3i qua c\u00e1c b\u01b0\u1edbc sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u01b0\u1edbc 1: Nh\u00e2n c\u00e1c v\u1ebf c\u1ee7a hai ph\u01b0\u01a1ng tr\u00ecnh trong h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh v\u1edbi m\u1ed9t s\u1ed1 th\u00edch h\u1ee3p, sao cho h\u1ec7 s\u1ed1 c\u1ee7a m\u1ed9t \u1ea9n n\u00e0o \u0111\u00f3 trong hai ph\u01b0\u01a1ng tr\u00ecnh c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eb1ng nhau ho\u1eb7c \u0111\u1ed1i nhau<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u01b0\u1edbc 2: S\u1eed d\u1ee5ng quy t\u1eafc c\u1ed9ng \u0111\u1ea1i s\u1ed1 ch\u00fang ta v\u1eeba n\u00eau \u1edf tr\u00ean \u0111\u1ec3 cho ra k\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh m\u1edbi, trong \u0111\u00f3 l\u01b0u \u00fd, m\u1ed9t ph\u01b0\u01a1ng tr\u00ecnh m\u00e0 h\u1ec7 s\u1ed1 c\u1ee7a m\u1ed9t trong hai \u1ea9n b\u1eb1ng 0 (t\u1ee9c l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t \u1ea9n, ch\u1ee9 kh\u00f4ng ph\u1ea3i hai \u1ea9n)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u01b0\u1edbc 3: L\u00fac n\u00e0y, ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t \u1ea9n r\u1ed3i, c\u00e1c em \u00e1p d\u1ee5ng c\u00e1ch gi\u1ea3i c\u1ee7a ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t \u1ea9n \u0111\u1ec3 t\u00ecm ra nghi\u1ec7m \u0111\u00e3 cho.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 hi\u1ec3u h\u01a1n c\u00e1ch \u00e1p d\u1ee5ng c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, c\u00e1c em theo d\u00f5i c\u00e1ch gi\u1ea3i b\u00e0i to\u00e1n b\u1eb1ng v\u00ed d\u1ee5 sau \u0111\u00e2y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp v\u00ed d\u1ee5 v\u1ec1 c\u00e1ch gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2 hai \u1ea9n b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p c\u1ed9ng \u0111\u1ea1i s\u1ed1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t 2 \u1ea9n b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p th\u1ebf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quy t\u1eafc m\u00e0 c\u00e1c em c\u1ea7n ph\u1ea3i nh\u1edb khi s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p th\u1ec3 \u0111\u1ec3 gi\u1ea3i h\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n ch\u00ednh l\u00e0 d\u00f9ng \u0111\u1ec3 bi\u1ebfn \u0111\u1ed5i m\u1ed9t h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh th\u00e0nh m\u1ed9t h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh m\u1edbi t\u01b0\u01a1ng \u0111\u01b0\u01a1ng. Quy t\u1eafc n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n th\u00f4ng qua hai b\u01b0\u1edbc. \u0110\u1ea7u ti\u00ean, v\u1edbi h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho, ta c\u1ea7n bi\u1ec3u di\u1ec5n m\u1ed9t \u1ea9n theo \u1ea9n kia r\u1ed3i th\u1ebf v\u00e0o ph\u01b0\u01a1ng tr\u00ecnh th\u1ee9 2 \u0111\u1ec3 t\u1ea1o ra m\u1ed9t ph\u01b0\u01a1ng tr\u00ecnh m\u1edbi (ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t \u1ea9n). Sau \u0111\u00f3, d\u00f9ng ph\u01b0\u01a1ng tr\u00ecnh m\u1edbi n\u00e0y thay th\u1ebf cho ph\u01b0\u01a1ng tr\u00ecnh th\u1ee9 2 trong h\u1ec7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u01b0 v\u1eady, \u0111\u1ec3 gi\u1ea3i theo ph\u01b0\u01a1ng ph\u00e1p th\u1ebf, c\u1ea7n l\u00e0m theo c\u00e1ch sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u01b0\u1edbc 1: S\u1eed d\u1ee5ng quy t\u1eafc th\u1ebf \u0111\u1ec3 bi\u1ebfn \u0111\u1ed5i ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho sang m\u1ed9t h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh m\u1edbi, trong \u0111\u00f3 b\u1eaft bu\u1ed9c ph\u1ea3i xu\u1ea5t hi\u1ec7n m\u1ed9t ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t \u1ea9n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u01b0\u1edbc 2: Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t \u1ea9n v\u00e0 t\u00ecm ki\u1ebfm nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh \u0111\u00e3 cho.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1edbi c\u00e1ch gi\u1ea3i n\u00e0y, c\u00e1c em s\u1ebd t\u00ecm ra nghi\u1ec7m c\u1ee7a h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh m\u1ed9t c\u00e1ch nhanh ch\u00f3ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5 v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p th\u1ebf v\u00e0 c\u00e1ch gi\u1ea3i<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u01b0 v\u1eady, c\u00e1c em \u0111\u00e3 v\u1eeba c\u00f9ng Vietlearn t\u00ecm hi\u1ec3u xong kh\u00e1i ni\u1ec7m c\u0169ng nh\u01b0 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i c\u1ee7a h\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n r\u1ed3i. \u0110\u00e2y l\u00e0 m\u1ed9t ki\u1ebfn th\u1ee9c to\u00e1n quan tr\u1ecdng c\u1ea7n n\u1eafm ch\u1eafc. Hy v\u1ecdng th\u00f4ng qua b\u00e0i h\u1ecdc, c\u00e1c em d\u1ec5 d\u00e0ng l\u00e0m \u0111\u01b0\u1ee3c c\u00e1c b\u00e0i t\u01b0\u01a1ng t\u1ef1 nh\u00e9.<\/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\">Gi\u1ea3i h\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p th\u1ebf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u01b0\u01a1ng tr\u00ecnh quy v\u1ec1 ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t b\u1eadc hai \u2013 H\u1ecdc To\u00e1n 9<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Trong n\u1ed9i dung ch\u01b0\u01a1ng tr\u00ecnh \u0110\u1ea1i s\u1ed1 l\u1edbp 9, c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c ti\u1ebfp x\u00fac v\u1edbi h\u1ec7 hai ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc nh\u1ea5t hai \u1ea9n. N\u00f3 l\u00e0 b\u00e0i h\u1ecdc c\u1ea7n thi\u1ebft \u0111\u1ec3 c\u00e1c em \u00e1p d\u1ee5ng trong c\u00e1c b\u00e0i h\u1ecdc v\u1ec1 gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh. B\u00e0i vi\u1ebft h\u00f4m nay, Vietlearn s\u1ebd [&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-1099","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\/1099","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=1099"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1099\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1099"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1099"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1099"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}