Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
Quy t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 g\u00e2y nhi\u1ec1u kh\u00f3 kh\u0103n v\u00e0 \u0111\u00f2i h\u1ecfi s\u1ef1 t\u1ed5ng h\u1ee3p l\u00fd thuy\u1ebft kh\u00e1 l\u1edbn so v\u1edbi ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc \u0111\u1ea7u c\u1ea5p h\u1ecdc trung h\u1ecdc c\u01a1 s\u1edf. B\u00ean c\u1ea1nh \u0111\u00f3, nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u v\u00e0 kh\u00e1c d\u1ea5u \u0111\u01b0\u1ee3c h\u1ecdc li\u00ean ti\u1ebfp g\u00e2y ra nh\u1ea7m l\u1eabn cho kh\u00e1 nhi\u1ec1u h\u1ecdc sinh<\/a>. V\u00ec v\u1eady, trong b\u00e0i vi\u1ebft n\u00e0y, h\u00e3y t\u1ed5ng h\u1ee3p l\u00fd thuy\u1ebft v\u00e0 b\u00e0i t\u1eadp c\u1ee7a d\u1ea1ng to\u00e1n n\u00e0y. V\u00e0 t\u00ecm ra m\u1ed9t v\u00e0i b\u00ed quy\u1ebft h\u1ecdc t\u1ed1t m\u00f4n to\u00e1n. C\u0169ng nh\u01b0 r\u00e8n luy\u1ec7n \u0111\u1ec3 t\u0103ng kh\u1ea3 n\u0103ng t\u1eadp trung nh\u00e9!<\/p>\n\n\n\n Quy t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u<\/p>\n\n\n\n Nh\u00e2n hai s\u1ed1 nguy\u00ean d\u01b0\u01a1ng<\/p>\n\n\n\n V\u1ec1 nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n, nh\u00e2n hai s\u1ed1 nguy\u00ean d\u01b0\u01a1ng t\u1ee9c l\u00e0 b\u00e0i t\u1eadp t\u00ednh t\u00edch c\u1ee7a c\u00e1c s\u1ed1 t\u1ef1 nhi\u00ean. V\u1edbi d\u1ea1ng b\u00e0i n\u00e0y, c\u00e1c em h\u1ecdc sinh<\/a> \u00e1p d\u1ee5ng t\u01b0\u01a1ng t\u1ef1 c\u00e1c b\u00e0i t\u00ednh t\u00edch \u0111\u00e3 h\u1ecdc \u1edf l\u1edbp d\u01b0\u1edbi. C\u00f3 m\u1ed9t s\u1ed1 d\u1ea1ng t\u00ednh t\u00edch nh\u01b0:<\/p>\n\n\n\n Nh\u00e2n hai s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 1 ch\u1eef s\u1ed1 (b\u1ea3ng c\u1eedu ch\u01b0\u01a1ng)<\/p>\n\n\n\n Nh\u00e2n hai s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 2 ch\u1eef s\u1ed1<\/p>\n\n\n\n Nh\u00e2n hai s\u1ed1 t\u1ef1 nhi\u00ean c\u00f3 h\u01a1n 2 ch\u1eef s\u1ed1<\/p>\n\n\n\n \u2026<\/p>\n\n\n\n V\u00ed d\u1ee5: V\u1ec1 d\u1ea1ng to\u00e1n nh\u00e2n hai s\u1ed1 nguy\u00ean d\u01b0\u01a1ng n\u00e0y, ta c\u00f3 b\u00e0i t\u1eadp sau:<\/p>\n\n\n\n 462 . 28= 12936<\/p>\n\n\n\n 8 . 9= 72<\/p>\n\n\n\n Quy t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u<\/p>\n\n\n\n Nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m<\/p>\n\n\n\n \u0110\u1ec3 nh\u00e2n hai s\u1ed1 nguy\u00ean \u00e2m, ta x\u00e1c \u0111\u1ecbnh gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a t\u1eebng th\u1eeba s\u1ed1. V\u00e0 nh\u00e2n ch\u00fang v\u1edbi nhau.<\/p>\n\n\n\n T\u1ed5ng h\u1ee3p, ta c\u00f3 c\u00f4ng th\u1ee9c sau:<\/p>\n\n\n\n \u2013 a. (-b) = |-a| . |-b| = a. b<\/p>\n\n\n\n V\u00ed d\u1ee5: T\u00ednh t\u00edch c\u1ee7a c\u00e1c ph\u00e9p t\u00ednh sau:<\/p>\n\n\n\n -25. (-5)= 125<\/p>\n\n\n\n -258.(-12) = 3096<\/p>\n\n\n\n -6 . (-8) = 48<\/p>\n\n\n\n Quy t\u1eafc<\/p>\n\n\n\n M\u1ed9t s\u1ed1 l\u01b0u \u00fd v\u1ec1 nh\u00e2n hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n T\u00ecm d\u1ea5u c\u1ee7a m\u1ed9t t\u00edch<\/p>\n\n\n\n (+) . (+) = +<\/p>\n\n\n\n (-) . (-) = +<\/p>\n\n\n\n (-) . (+) = \u2013<\/p>\n\n\n\n (+) . (-) = \u2013<\/p>\n\n\n\n Xem l\u1ea1i quy t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u t\u1ea1i b\u00e0i 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 N\u1ebfu ta c\u00f3 a . b = 0 th\u00ec:<\/p>\n\n\n\n a = 0 ho\u1eb7c b = 0<\/p>\n\n\n\n Trong m\u1ed9t t\u00edch, n\u1ebfu \u0111\u1ed5i d\u1ea5u m\u1ed9t th\u1eeba s\u1ed1 th\u00ec t\u00edch \u0111\u00f3 \u0111\u1ed5i d\u1ea5u. N\u1ebfu thay \u0111\u1ed5i d\u1ea5u c\u1ee7a c\u1ea3 2 th\u1eeba s\u1ed1 trong t\u00edch th\u00ec t\u00edch \u0111\u00f3 kh\u00f4ng \u0111\u1ed5i d\u1ea5u.<\/p>\n\n\n\n M\u1ed9t s\u1ed1 d\u1ea1ng to\u00e1n c\u01a1 b\u1ea3n v\u1ec1 nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u<\/p>\n\n\n\n D\u1ea1ng 1: T\u00ednh to\u00e1n \u0111\u01a1n gi\u1ea3n<\/p>\n\n\n\n Ph\u01b0\u01a1ng ph\u00e1p l\u00e0m b\u00e0i: \u00c1p d\u1ee5ng nguy\u00ean t\u1eafc t\u00ecm t\u00edch c\u1ee7a hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u \u0111\u1ec3 l\u00e0m b\u00e0i t\u1eadp<\/p>\n\n\n\n M\u1ed9t s\u1ed1 d\u1ea1ng to\u00e1n c\u01a1 b\u1ea3n<\/p>\n\n\n\n V\u00ed d\u1ee5: B\u00e0i t\u1eadp t\u00ednh c\u00e1c ph\u00e9p t\u00ednh sau:<\/p>\n\n\n\n -123. (-486)<\/p>\n\n\n\n -488.(- 252)<\/p>\n\n\n\n (-124). (-522)<\/p>\n\n\n\n \u0110\u00e1p \u00e1n tham kh\u1ea3o:<\/p>\n\n\n\n 59778<\/p>\n\n\n\n 59200<\/p>\n\n\n\n 122976<\/p>\n\n\n\n 64728<\/p>\n\n\n\n D\u1ea1ng 2: C\u00e1c b\u00e0i to\u00e1n \u0111\u01b0a v\u1ec1 d\u1ea1ng nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u<\/p>\n\n\n\n Ph\u01b0\u01a1ng ph\u00e1p l\u00e0m b\u00e0i: D\u1ef1a v\u00e0o y\u00eau c\u1ea7u m\u00e0 \u0111\u1ec1 b\u00e0i \u0111\u01b0a ra, k\u1ebft h\u1ee3p nguy\u00ean t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u. \u0110\u01b0a v\u1ec1 d\u1ea1ng t\u00ednh to\u00e1n c\u01a1 b\u1ea3n v\u00e0 gi\u1ea3i nh\u01b0 d\u1ea1ng 1.<\/p>\n\n\n\n M\u1ed9t s\u1ed1 d\u1ea1ng to\u00e1n c\u01a1 b\u1ea3n<\/p>\n\n\n\n V\u00ed d\u1ee5: \u0110i\u1ec1n s\u1ed1 c\u00f2n thi\u1ebfu v\u00e0o b\u1ea3ng sau<\/p>\n\n\n\n a 12 8 56 2<\/p>\n\n\n\n b 18 42 24 10<\/p>\n\n\n\n (-a). (-b) ??? ??? ??? ???<\/p>\n\n\n\n a. b ??? ??? ??? ???<\/p>\n\n\n\n G\u1ee3i \u00fd \u0111\u00e1p \u00e1n tham kh\u1ea3o:<\/p>\n\n\n\n a 12 8 56 2<\/p>\n\n\n\n b 18 42 24 10<\/p>\n\n\n\n (-a). (-b) 216 336 1344 20<\/p>\n\n\n\n a. b 216 336 1344 20<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u s\u00e1ch gi\u00e1o khoa to\u00e1n l\u1edbp 6<\/p>\n\n\n\n B\u00e0i 78 (trang 91 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u s\u00e1ch gi\u00e1o khoa to\u00e1n l\u1edbp 6<\/p>\n\n\n\n B\u00e0i 79 (trang 91 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u s\u00e1ch gi\u00e1o khoa to\u00e1n l\u1edbp 6<\/p>\n\n\n\n B\u00e0i 80 (trang 91 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u s\u00e1ch gi\u00e1o khoa to\u00e1n l\u1edbp 6<\/p>\n\n\n\n B\u00e0i 81 (trang 91 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u s\u00e1ch gi\u00e1o khoa to\u00e1n l\u1edbp 6<\/p>\n\n\n\n B\u00e0i 82 (trang 92 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u s\u00e1ch gi\u00e1o khoa to\u00e1n l\u1edbp 6<\/p>\n\n\n\n B\u00e0i 83 (trang 92 SGK To\u00e1n 6 T\u1eadp 1):<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u s\u00e1ch gi\u00e1o khoa to\u00e1n l\u1edbp 6<\/p>\n\n\n\n M\u1ed9t s\u1ed1 th\u00f3i quen t\u1ed1t gi\u00fap con t\u1eadp trung, n\u00e2ng cao n\u0103ng l\u1ef1c h\u1ecdc to\u00e1n<\/p>\n\n\n\n B\u00ed quy\u1ebft \u0111\u1ec3 h\u1ecdc t\u1ed1t to\u00e1n h\u1ecdc kh\u00f4ng ch\u1ec9 \u0111\u1ed1i v\u1edbi to\u00e1n l\u1edbp 6. M\u00e0 c\u00f2n l\u00e0 b\u1ed9 m\u00f4n to\u00e1n trung h\u1ecdc ph\u1ed5 th\u00f4ng n\u00f3i chung l\u00e0 s\u1ef1 t\u1eadp trung. Tuy nhi\u00ean, m\u1ea5t t\u1eadp trung l\u1ea1i l\u00e0 m\u1ed9t v\u1ea5n \u0111\u1ec1 g\u00e2y kh\u00f3 kh\u0103n cho c\u1ea3 nh\u1eefng h\u1ecdc sinh<\/a> xu\u1ea5t s\u1eafc nh\u1ea5t. \u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, gi\u00fap c\u00e1c con n\u00e2ng cao tr\u00ecnh \u0111\u1ed9 to\u00e1n h\u1ecdc. Vietlearn t\u1ed5ng h\u1ee3p m\u1ed9t v\u00e0i b\u00ed quy\u1ebft d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n\n\n\n Lo\u1ea1i b\u1ecf nh\u1eefng suy ngh\u0129 ngo\u00e0i l\u1ec1 ra kh\u1ecfi th\u1eddi gian h\u1ecdc t\u1eadp<\/a><\/p>\n\n\n\n Trong \u0111\u1eddi s\u1ed1ng c\u0169ng nh\u01b0 trong qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp<\/a>, c\u00e1c con s\u1ebd b\u1ecb nh\u1eefng suy ngh\u0129 v\u1ee5n v\u1eb7t l\u00e0m m\u1ea5t t\u1eadp trung. \u0110\u1ec3 lo\u1ea1i b\u1ecf nh\u1eefng \u0111i\u1ec1u \u0111\u00f3 l\u00e0 kh\u00f4ng \u0111\u01a1n gi\u1ea3n. \u0110\u1eb7c bi\u1ec7t l\u00e0 v\u1edbi tr\u1ebb l\u1edbp 6 \u2013 trong kho\u1ea3ng th\u1eddi gian thay \u0111\u1ed5i t\u00e2m l\u00fd. B\u00ean c\u1ea1nh vi\u1ec7c h\u1ecdc t\u1eadp<\/a>, 11 tu\u1ed5i l\u00e0 \u0111\u1ed9 tu\u1ed5i con c\u00f3 th\u00eam nh\u1eefng m\u1ed1i quan t\u00e2m ngo\u00e0i l\u1ec1 kh\u00e1c. V\u00ed d\u1ee5 nh\u01b0 chuy\u1ec7n b\u1ea1n b\u00e8, \u00e1p l\u1ef1c t\u00e2m l\u00fd, \u2026 Th\u1eadm ch\u00ed, c\u00f3 tr\u1ebb \u0111\u00e3 xu\u1ea5t hi\u1ec7n bi\u1ec3u hi\u1ec7n c\u1ee7a vi\u1ec7c y\u00eau s\u1edbm. Tr\u1ebb d\u1ec5 d\u00e0ng b\u1ecb thu h\u00fat b\u1edfi c\u00e1c b\u1ea1n kh\u00e1c gi\u1edbi. V\u00e0 nh\u1eefng suy ngh\u0129 m\u1edbi l\u1ea1 \u1ea5y s\u1ebd l\u00e0 r\u00e0o c\u1ea3n ng\u0103n b\u01b0\u1edbc tr\u1ebb gi\u1eef t\u1eadp trung trong h\u1ecdc t\u1eadp<\/a>. Vi\u1ec7c n\u00e0y n\u1ebfu k\u00e9o d\u00e0i l\u00e2u s\u1ebd \u1ea3nh h\u01b0\u1edfng ti\u00eau c\u1ef1c \u0111\u1ebfn k\u1ebft qu\u1ea3 h\u1ecdc t\u1eadp c\u1ee7a con \u1edf tr\u01b0\u1eddng.<\/p>\n\n\n\n Lo\u1ea1i b\u1ecf nh\u1eefng suy ngh\u0129 ngo\u00e0i l\u1ec1 ra kh\u1ecfi th\u1eddi gian h\u1ecdc t\u1eadp<\/p>\n\n\n\n Kh\u00f4ng ch\u1ec9 c\u00e1c em h\u1ecdc sinh, ba m\u1eb9 c\u1ea7n \u0111\u1eb7t m\u1ed9t s\u1ef1 quan t\u00e2m \u0111\u00fang m\u1ee9c cho tr\u1ebb \u1edf giai \u0111o\u1ea1n n\u00e0y. H\u00e3y gi\u1eef cho con s\u1ef1 t\u1eadp trung b\u1eb1ng c\u00e1ch \u0111\u1ec3 con hi\u1ec3u r\u1eb1ng. C\u00e1c con ch\u00ednh l\u00e0 ng\u01b0\u1eddi \u0111i\u1ec1u khi\u1ec3n suy ngh\u0129 c\u1ee7a ch\u00ednh m\u00ecnh. V\u00ec v\u1eady, c\u00e1c con ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 t\u1ef1 m\u00ecnh lo\u1ea1i b\u1ecf nh\u1eefng suy ngh\u0129 ti\u00eau c\u1ef1c. Nh\u1eefng \u0111i\u1ec1u l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c h\u1ecdc c\u1ee7a b\u1ea3n th\u00e2n. Nh\u1eefng v\u1ea5n \u0111\u1ec1 cu\u1ed9c s\u1ed1ng kh\u00e1c, c\u00e1c con c\u00f3 th\u1ec3 ngh\u0129 t\u1edbi sau. Khi \u0111\u00e3 ho\u00e0n th\u00e0nh t\u1ea5t c\u1ea3 b\u00e0i t\u1eadp ph\u1ee5c v\u1ee5 cho vi\u1ec7c h\u1ecdc t\u1eadp c\u1ee7a con.<\/p>\n\n\n\n L\u1eadp th\u1eddi gian bi\u1ec3u<\/p>\n\n\n\n Tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u h\u1ecdc, c\u00e1c em c\u1ea7n l\u00ean k\u1ebf ho\u1ea1ch r\u00f5 r\u00e0ng cho qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp. V\u00ed d\u1ee5: c\u00e1c em c\u00f3 th\u1ec3 h\u1ecdc m\u00f4n to\u00e1n trong v\u00f2ng 90 ph\u00fat. Sau \u0111\u00f3 chuy\u1ec3n sang \u00f4n luy\u1ec7n ti\u1ebfng Anh. R\u1ed3i quay l\u1ea1i ti\u1ebfp t\u1ee5c r\u00e8n luy\u1ec7n m\u00f4n to\u00e1n. Vi\u1ec7c l\u1eadp th\u1eddi gian bi\u1ec3u gi\u00fap c\u00e1c con \u0111\u1ecbnh h\u00ecnh \u0111\u01b0\u1ee3c vi\u1ec7c h\u1ecdc. Ph\u00e2n b\u1ed5 th\u1eddi gian v\u00e0 ki\u1ebfn th\u1ee9c \u1edf m\u1ed7i m\u00f4n h\u1ecdc.<\/p>\n\n\n\n B\u00ean c\u1ea1nh \u0111\u00f3, c\u00e1c con n\u00ean c\u00f3 nh\u1eefng kho\u1ea3ng ngh\u1ec9 ng\u01a1i sau m\u1ed9t th\u1eddi gian h\u1ecdc t\u1eadp. Theo ph\u01b0\u01a1ng ph\u00e1p qu\u1ea3 c\u00e0 chua pomodoro, c\u00e1c con c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng th\u1eddi gian h\u1ecdc t\u1eadp v\u00e0 ngh\u1ec9 ng\u01a1i xen k\u1ebd. Nh\u01b0 c\u1ee9 sau m\u1ed7i 25 ph\u00fat l\u00e0m vi\u1ec7c th\u1ef1c s\u1ef1 t\u1eadp trung, c\u00e1c con n\u00ean d\u00e0nh ra m\u1ed9t kho\u1ea3ng th\u1eddi gian ng\u1eafn \u0111\u1ec3 ngh\u1ec9 ng\u01a1i. Nh\u01b0 v\u1eady, con s\u1ebd v\u1eeba c\u00f3 m\u1ed9t kho\u1ea3ng th\u1eddi gian \u0111\u1ec3 h\u1ecdc t\u1eadp hi\u1ec7u qu\u1ea3. L\u1ea1i v\u1eeba duy tr\u00ec \u0111\u01b0\u1ee3c h\u1ee9ng th\u00fa trong h\u1ecdc t\u1eadp c\u0169ng nh\u01b0 t\u1eadp trung.<\/p>\n\n\n\n L\u1eadp th\u1eddi gian bi\u1ec3u<\/p>\n\n\n\n Kh\u00f4ng n\u00ean d\u00e0nh qu\u00e1 nhi\u1ec1u th\u1eddi gian cho m\u1ed9t m\u00f4n h\u1ecdc. V\u00ec n\u1ebfu c\u00e1c con h\u1ecdc m\u1ed9t m\u00f4n qu\u00e1 l\u00e2u. C\u00e1c con s\u1ebd kh\u00f4ng ch\u1ec9 l\u00e0m m\u1ea5t \u0111i tinh th\u1ea7n h\u1ecdc t\u1eadp v\u00e0 s\u1ef1 nhi\u1ec7t huy\u1ebft. M\u00e0 c\u00f2n kh\u00f4ng t\u1ea1o \u0111\u01b0\u1ee3c hi\u1ec7u qu\u1ea3 nh\u01b0 mong \u0111\u1ee3i. V\u00ec n\u00e3o b\u1ed9 s\u1ebd ch\u00e1n n\u1ea3n v\u00e0 b\u00e3o h\u00f2a l\u01b0\u1ee3ng ki\u1ebfn th\u1ee9c c\u00e1c con \u0111ang c\u1ed1 ti\u1ebfp thu.<\/p>\n\n\n\n L\u1eddi k\u1ebft:<\/p>\n\n\n\n Tr\u00ean \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 t\u1ed5ng h\u1ee3p c\u1ee7a toppy v\u1ec1 ch\u1ee7 \u0111\u1ec1 to\u00e1n l\u1edbp 6. Nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u. Vietlearn r\u1ea5t vui khi \u0111\u01b0\u1ee3c \u0111\u1ed3ng h\u00e0nh c\u0169ng ba m\u1eb9 v\u00e0 c\u00e1c con trong ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc t\u1eadp m\u1edbi v\u00e8 \u0111\u1eb7c bi\u1ec7t n\u00e0y. Xem th\u00eam c\u00e1c ch\u1ee7<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":" Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Quy t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 g\u00e2y nhi\u1ec1u kh\u00f3 kh\u0103n v\u00e0 \u0111\u00f2i h\u1ecfi s\u1ef1 t\u1ed5ng h\u1ee3p l\u00fd thuy\u1ebft kh\u00e1 l\u1edbn so v\u1edbi ch\u01b0\u01a1ng tr\u00ecnh h\u1ecdc \u0111\u1ea7u c\u1ea5p h\u1ecdc trung h\u1ecdc c\u01a1 s\u1edf. B\u00ean c\u1ea1nh \u0111\u00f3, nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u v\u00e0 kh\u00e1c […]<\/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-2715","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\/2715","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=2715"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2715\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=2715"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=2715"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=2715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}