{"id":1057,"date":"2021-10-08T13:07:50","date_gmt":"2021-10-08T13:07:50","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=1057"},"modified":"2021-10-14T22:10:35","modified_gmt":"2021-10-14T15:10:35","slug":"duong-trung-binh-cua-hinh-thang-va-cac-dang-bai-tap","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/duong-trung-binh-cua-hinh-thang-va-cac-dang-bai-tap\/","title":{"rendered":"\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp"},"content":{"rendered":"\n<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p>H\u1ecdc to\u00e1n kh\u00f4ng kh\u00f3, ch\u1ec9 c\u1ea7n b\u1ea1n c\u00f3 t\u01b0 duy c\u0169ng nh\u01b0 h\u1ec7 th\u1ed1ng c\u00e1c ki\u1ebfn th\u1ee9c m\u1ed9t c\u00e1ch logic v\u1edbi nhau. Vietlearn s\u1ebd gi\u00fap b\u1ea1n th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y. Ng\u00e0y h\u00f4m nay, h\u00e3y c\u00f9ng ch\u00fang Vietlearn t\u00ecm hi\u1ec3u v\u1ec1 chuy\u00ean \u0111\u1ec1 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang. N\u1ed9i dung n\u00e0y s\u1ebd gi\u00fap cho b\u1ea1n h\u1ecdc t\u1ed1t m\u00f4n h\u1ecdc n\u00e0y h\u01a1n. Ngay b\u00e2y gi\u1edd s\u1ebd l\u00e0 c\u00e1c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<\/a>.<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c c\u1ee7a h\u00ecnh thang l\u1edbp 8<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c, c\u1ee7a h\u00ecnh thang<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c c\u1ee7a h\u00ecnh thang l\u1edbp 8 c\u1ee5 th\u1ec3 c\u1ee7a t\u1eebng ph\u1ea7n nh\u01b0 sau:<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m hai c\u1ea1nh c\u1ee7a tam gi\u00e1c v\u1edbi nhau.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>\u0394ABC c\u00f3 M l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB , N l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AC n\u00ean MN l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC \u21d2 MN\/\/BC; MN=12BC<\/p>\n\n\n\n<p>\u0110\u1ecbnh l\u00ed \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh tam gi\u00e1c:<\/p>\n\n\n\n<p>\u2013 \u0110\u1ecbnh l\u00ed 1: \u0110\u01b0\u1eddng th\u1eb3ng \u0111i qua trung \u0111i\u1ec3m m\u1ed9t c\u1ea1nh c\u1ee7a tam gi\u00e1c v\u00e0 song song v\u1edbi c\u1ea1nh th\u1ee9 hai th\u00ec \u0111i qua trung \u0111i\u1ec3m c\u1ee7a c\u1ea1nh th\u1ee9 ba.<\/p>\n\n\n\n<p>\u2013 \u0110\u1ecbnh l\u00ed 2: \u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c th\u00ec song song v\u1edbi c\u1ea1nh th\u1ee9 ba v\u00e0 b\u1eb1ng n\u1eeda c\u1ea1nh \u1ea5y.<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m hai c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh thang.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<p>H\u00ecnh thang ABCD c\u00f3 E l\u00e0 trung \u0111i\u1ec3m AD , F l\u00e0 trung \u0111i\u1ec3m c\u1ee7a BC n\u00ean EF l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh \u21d2<\/p>\n\n\n\n<p>C\u00e1c \u0111\u1ecbnh l\u00ed v\u1ec1 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang:<\/p>\n\n\n\n<p>\u0110\u1ecbnh l\u00ed 3: \u0110\u01b0\u1eddng th\u1eb3ng \u0111i qua trung \u0111i\u1ec3m m\u1ed9t c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh thang v\u00e0 song song v\u1edbi hai \u0111\u00e1y th\u00ec \u0111i qua trung \u0111i\u1ec3m c\u1ea1nh b\u00ean th\u1ee9 hai<\/p>\n\n\n\n<p>\u2013 \u0110\u1ecbnh l\u00ed 4: \u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang th\u00ec song song v\u1edbi hai \u0111\u00e1y v\u00e0 b\u1eb1ng n\u1eeda t\u1ed5ng hai \u0111\u00e1y.<\/p>\n\n\n\n<p>T\u1ed5ng h\u1ee3p l\u1ea1i \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang v\u00e0 h\u00ecnh tam gi\u00e1c<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p> T\u1ee9 gi\u00e1c<\/p><\/blockquote>\n\n\n\n<p>C\u00e1c d\u1ea1ng to\u00e1n v\u1ec1 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang v\u00e0 h\u00ecnh tam gi\u00e1c<\/p>\n\n\n\n<p>D\u1ea1ng 1: D\u1ef1a v\u00e0o \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c v\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang, t\u00ednh \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh<\/p>\n\n\n\n<p>V\u00ed d\u1ee5: Cho tam gi\u00e1c ABC c\u00f3 AB = 6cm, AC = 10cm, BC = 14cm. G\u1ecdi D, E, F l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, AC v\u00e0 BC. T\u00ednh \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh DE, DF v\u00e0 EF.<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p>\u2013 X\u00e9t tam gi\u00e1c ABC c\u00f3 D l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, E l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AC<\/p>\n\n\n\n<p>=&gt; DE l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC<\/p>\n\n\n\n<p>\u2013 X\u00e9t tam gi\u00e1c ABC c\u00f3 D l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, F l\u00e0 trung \u0111i\u1ec3m c\u1ee7a BC<\/p>\n\n\n\n<p>=&gt; DF l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC<\/p>\n\n\n\n<p>\u2013 X\u00e9t tam gi\u00e1c ABC c\u00f3 E l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AC, F l\u00e0 trung \u0111i\u1ec3m c\u1ee7a BC<\/p>\n\n\n\n<p>Suy ra EF l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC<\/p>\n\n\n\n<p>D\u1ea1ng 2: Ch\u1ee9ng minh m\u1ed9t c\u1ea1nh l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c, h\u00ecnh thang<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng \u0111\u1ecbnh ngh\u0129a \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c v\u00e0 h\u00ecnh thang.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m hai c\u1ea1nh c\u1ee7a tam gi\u00e1c.<\/li><li>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m hai c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh thang.<\/li><\/ul>\n\n\n\n<p>V\u00ed d\u1ee5: Cho tam gi\u00e1c ABC c\u00f3 I, J l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u00e1c c\u1ea1nh AB, BC. Ch\u1ee9ng minh IJ l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC.<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<p>X\u00e9t tam gi\u00e1c ABC c\u00f3: I l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, J l\u00e0 trung \u0111i\u1ec3m c\u1ee7a BC<\/p>\n\n\n\n<p>=&gt; IJ l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC (\u0111\u1ecbnh l\u00fd) (\u0111pcm)<\/p>\n\n\n\n<p>D\u1ea1ng 3: Ch\u1ee9ng minh c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi nhau<\/p>\n\n\n\n<p>V\u00ed d\u1ee5: Cho tam gi\u00e1c ABC c\u00f3 I, J l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a c\u00e1c c\u1ea1nh AB, BC. Ch\u1ee9ng minh t\u1ee9 gi\u00e1c AIJC l\u00e0 h\u00ecnh thang.<\/p>\n\n\n\n<p>L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>X\u00e9t tam gi\u00e1c ABC c\u00f3: I l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, J l\u00e0 trung \u0111i\u1ec3m c\u1ee7a BC<\/li><\/ul>\n\n\n\n<p>=&gt; IJ l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC (\u0111\u1ecbnh l\u00fd)<\/p>\n\n\n\n<p>=&gt; IJ \/\/ AC (\u0111\u1ecbnh l\u00fd)<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>X\u00e9t t\u1ee9 gi\u00e1c AIJC c\u00f3: IJ \/\/ AC (cmt)<\/li><\/ul>\n\n\n\n<p>=&gt; T\u1ee9 gi\u00e1c AIJC l\u00e0 h\u00ecnh thang (\u0111\u1ecbnh ngh\u0129a)<\/p>\n\n\n\n<p>D\u1ea1ng 4: Ch\u1ee9ng minh c\u00e1c h\u1ec7 th\u1ee9c v\u1ec1 c\u1ea1nh v\u00e0 g\u00f3c. T\u00ednh c\u00e1c c\u1ea1nh v\u00e0 g\u00f3c.<\/p>\n\n\n\n<p>Ph\u01b0\u01a1ng ph\u00e1p:<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng t\u00ednh ch\u1ea5t \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c v\u00e0 h\u00ecnh thang<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c th\u00ec song song v\u1edbi c\u1ea1nh th\u1ee9 ba v\u00e0 b\u1eb1ng n\u1eeda c\u1ea1nh \u1ea5y.<\/li><li>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang th\u00ec song song v\u1edbi hai \u0111\u00e1y v\u00e0 b\u1eb1ng n\u1eeda t\u1ed5ng hai \u0111\u00e1y.<\/li><li>\u0110\u01b0\u1eddng th\u1eb3ng \u0111i qua trung \u0111i\u1ec3m m\u1ed9t c\u1ea1nh c\u1ee7a tam gi\u00e1c v\u00e0 song song v\u1edbi c\u1ea1nh th\u1ee9 hai th\u00ec \u0111i qua trung \u0111i\u1ec3m c\u1ea1nh th\u1ee9 ba.<\/li><li>\u0110\u01b0\u1eddng th\u1eb3ng \u0111i qua trung \u0111i\u1ec3m m\u1ed9t c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh thang v\u00e0 song song v\u1edbi hai \u0111\u00e1y th\u00ec \u0111i qua trung \u0111i\u1ec3m c\u1ea1nh b\u00ean th\u1ee9 hai.<\/li><\/ul>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c c\u1ee7a h\u00ecnh thang b\u00e0i t\u1eadp<\/p>\n\n\n\n<p>B\u00e0i 1: Cho tam gi\u00e1c ABC c\u00f3 D, E l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, AC. Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y sai?<\/p>\n\n\n\n<p>DE l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC.<\/p>\n\n\n\n<p>DE song song v\u1edbi BC.<\/p>\n\n\n\n<p>DECB l\u00e0 h\u00ecnh thang c\u00e2n.<\/p>\n\n\n\n<p>DE c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng n\u1eeda BC.<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn:<\/p>\n\n\n\n<p>X\u00e9t tam gi\u00e1c ABC c\u00f3 D, E l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, AC<\/p>\n\n\n\n<p>\u21d2 DE l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC<\/p>\n\n\n\n<p>Hay DE\/\/BC v\u00e0 DE = (1\/2).BC<\/p>\n\n\n\n<p>H\u00ecnh thang c\u00e2n l\u00e0 h\u00ecnh thang c\u00f3 hai g\u00f3c k\u1ec1 m\u1ed9t c\u1ea1nh b\u1eb1ng nhau v\u00e0 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau nh\u01b0ng b\u00e0i to\u00e1n n\u00e0y hai g\u00f3c k\u1ec1 m\u1ed9t c\u1ea1nh \u0111\u00e1y kh\u00f4ng b\u1eb1ng nhau<\/p>\n\n\n\n<p>\u2192 \u0110\u00e1p \u00e1n C sai.<\/p>\n\n\n\n<p>Ch\u1ecdn \u0111\u00e1p \u00e1n C.<\/p>\n\n\n\n<p>B\u00e0i 2: Cho tam gi\u00e1c ABC c\u00f3 D, E l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, AC v\u00e0 DE = 4 cm. Bi\u1ebft \u0111\u01b0\u1eddng cao AH = 6cm. Di\u1ec7n t\u00edch c\u1ee7a tam gi\u00e1c ABC l\u00e0?<\/p>\n\n\n\n<p>A. S = 24cm2 B. S = 16cm2 C. S = 48cm2 D. S = 32cm2<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn:<\/p>\n\n\n\n<p>X\u00e9t tam gi\u00e1c ABC c\u00f3 D, E l\u1ea7n l\u01b0\u1ee3t l\u00e0 trung \u0111i\u1ec3m c\u1ee7a AB, AC<\/p>\n\n\n\n<p>\u21d2 DE l\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a tam gi\u00e1c ABC<\/p>\n\n\n\n<p>Hay DE\/\/BC v\u00e0 DE = 1\/2BC \u21d2 BC = 2DE = 2.4 = 8 cm<\/p>\n\n\n\n<p>Khi \u0111\u00f3 ta c\u00f3: S = 1\/2AH.BC = 1\/2.6.8 = 24cm2<\/p>\n\n\n\n<p>Ch\u1ecdn \u0111\u00e1p \u00e1n A.<\/p>\n\n\n\n<p>B\u00e0i 3: Ch\u1ecdn ph\u00e1t bi\u1ec3u \u0111\u00fang<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i hai trung \u0111i\u1ec3m c\u1ee7a hai c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh thoi.<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i hai trung \u0111i\u1ec3m c\u1ee7a hai c\u1ea1nh \u0111\u1ed1i c\u1ee7a h\u00ecnh thoi.<\/p>\n\n\n\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang th\u00ec song song v\u1edbi hai \u0111\u00e1y v\u00e0 b\u1eb1ng t\u1ed5ng hai hai \u0111\u00e1y.<\/p>\n\n\n\n<p>M\u1ed9t h\u00ecnh thang c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t ho\u1eb7c nhi\u1ec1u \u0111\u01b0\u1eddng trung b\u00ecnh.<\/p>\n\n\n\n<p>H\u01b0\u1edbng d\u1eabn:<\/p>\n\n\n\n<p>\u0110\u1ecbnh ngh\u0129a: \u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m hai c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh thang.<\/p>\n\n\n\n<p>\u2192 \u0110\u00e1p \u00e1n A \u0111\u00fang.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang th\u00ec song song v\u1edbi hai \u0111\u00e1y v\u00e0 b\u1eb1ng n\u1eeda t\u1ed5ng c\u1ee7a hai \u0111\u00e1y.<\/li><li>M\u1ed9t h\u00ecnh thang th\u00ec ch\u1ec9 c\u00f3 1 \u0111\u01b0\u1eddng trung b\u00ecnh duy nh\u1ea5t.<\/li><\/ul>\n\n\n\n<p>Ch\u1ecdn \u0111\u00e1p \u00e1n A.<\/p>\n\n\n\n<p>T\u00ecm hi\u1ec3u th\u00eam c\u00e1ch gi\u1ea3i b\u00e0i to\u00e1n tr\u00ean Vietlearn<\/p>\n\n\n\n<p>Nh\u01b0 v\u1eady l\u00e0 c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang \u0111\u00e3 \u0111\u01b0\u1ee3c Vietlearn t\u1ed5ng h\u1ee3p \u0111\u1ea7y \u0111\u1ee7 ph\u00eda tr\u00ean. \u0110\u1ec3 h\u1ecdc t\u1ed1t h\u01a1n c\u00e1c m\u00f4n, b\u1ea1n c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0o Vietlearn.org\/ \u0111\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c c\u00e1c t\u00e0i li\u1ec7u c\u1ea7n thi\u1ebft.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u0110\u1ed1i x\u1ee9ng tr\u1ee5c<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn H\u1ecdc to\u00e1n kh\u00f4ng kh\u00f3, ch\u1ec9 c\u1ea7n b\u1ea1n c\u00f3 t\u01b0 duy c\u0169ng nh\u01b0 h\u1ec7 th\u1ed1ng c\u00e1c ki\u1ebfn th\u1ee9c m\u1ed9t c\u00e1ch logic v\u1edbi nhau. Vietlearn s\u1ebd gi\u00fap b\u1ea1n th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y. Ng\u00e0y h\u00f4m nay, h\u00e3y c\u00f9ng ch\u00fang Vietlearn t\u00ecm hi\u1ec3u v\u1ec1 chuy\u00ean \u0111\u1ec1 \u0111\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang. N\u1ed9i [&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-1057","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\/1057","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=1057"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1057\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1057"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}