Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
C\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u l\u00e0 ph\u1ea7n l\u00fd thuy\u1ebft v\u00e0 b\u00e0i t\u1eadp d\u1ec5 g\u00e2y nh\u1ea7m l\u1eabn cho h\u1ecdc sinh<\/a>. \u0110\u1ec3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c v\u1ec1 c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u. M\u1eddi ba m\u1eb9 v\u00e0 c\u00e1c con t\u00ecm hi\u1ec3u qua b\u00e0i vi\u1ebft sau:<\/p>\n\n\n\n Nguy\u00ean t\u1eafc c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n Khi c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, ta c\u00f3 2 nguy\u00ean t\u1eafc c\u0103n b\u1ea3n c\u1ea7n ch\u00fa \u00fd:<\/p>\n\n\n\n Nguy\u00ean t\u1eafc c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n Hai s\u1ed1 nguy\u00ean \u0111\u1ed1i nhau c\u00f3 t\u1ed5ng b\u1eb1ng 0.<\/p>\n\n\n\n Nh\u01b0 v\u1eady, ta c\u00f3 th\u1ec3 r\u00fat ra c\u00f4ng th\u1ee9c: a + (-a) = 0<\/p>\n\n\n\n V\u00ed d\u1ee5: 5 + (- 5) = 0<\/p>\n\n\n\n 6 + (-6) = 0<\/p>\n\n\n\n Mu\u1ed1n c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u kh\u00f4ng \u0111\u1ed1i nhau, ta t\u00ecm hi\u1ec7u hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a hai s\u1ed1 \u0111\u00f3. Sau \u0111\u00f3 \u0111\u1eb7t tr\u01b0\u1edbc gi\u00e1 tr\u1ecb v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c t\u1eeb hi\u1ec7u tr\u00ean d\u1ea5u c\u1ee7a s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i l\u1edbn h\u01a1n.<\/p>\n\n\n\n Nh\u01b0 v\u1eady, c\u00f3 th\u1ec3 hi\u1ec3u r\u1eb1ng: N\u1ebfu mu\u1ed1n c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u kh\u00f4ng \u0111\u1ed1i nhau. Ta c\u1ea7n l\u00e0m theo 3 b\u01b0\u1edbc c\u1ee5 th\u1ec3:<\/p>\n\n\n\n T\u00ecm gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a hai s\u1ed1 nguy\u00ean<\/p>\n\n\n\n Tim hi\u1ec7u gi\u1eefa hai gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i m\u00e0 ta v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c. L\u1ea5y s\u1ed1 l\u1edbn tr\u1eeb \u0111i s\u1ed1 nh\u1ecf v\u00e0 ghi ra k\u1ebft qu\u1ea3.<\/p>\n\n\n\n X\u00e1c \u0111\u1ecbnh d\u1ea5u cho k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng. B\u1eb1ng c\u00e1ch \u0111\u1eb7t tr\u01b0\u1edbc k\u1ebft qu\u1ea3 t\u00ecm \u0111\u01b0\u1ee3c d\u1ea5u c\u1ee7a s\u1ed1 c\u00f3 gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i l\u1edbn h\u01a1n.<\/p>\n\n\n\n V\u00ed d\u1ee5: ta c\u00f3 ph\u00e9p t\u00ednh: \u2013 12 + 8<\/p>\n\n\n\n B\u01b0\u1edbc 1: t\u00ecm gi\u00e1 tr\u1ecb tuy\u1ec7t \u0111\u1ed1i c\u1ee7a 2 s\u1ed1 nguy\u00ean ta c\u00f3 12 v\u00e0 8<\/p>\n\n\n\n B\u01b0\u1edbc 2: T\u00ecm hi\u1ec7u b\u1eb1ng c\u00e1ch l\u1ea5y 12 \u2013 8 = 4<\/p>\n\n\n\n B\u01b0\u1edbc 3: X\u00e1c \u0111\u1ecbnh d\u1ea5u. Ta th\u1ea5y 12 l\u1edbn h\u01a1n 8. V\u00ec th\u1ebf, d\u1ea5u c\u1ee7a ph\u00e9p t\u00ednh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh l\u00e0 d\u1ea5u c\u1ee7a s\u1ed1 12. V\u1eady, k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng l\u00e0 \u2013 4<\/p>\n\n\n\n T\u01b0\u01a1ng t\u1ef1, ta c\u00f3 c\u00e1c v\u00ed d\u1ee5 sau: 56 + (-20) = 36<\/p>\n\n\n\n \u2013 158 + 452= 294<\/p>\n\n\n\n -783255 + 6347= \u2013 776908<\/p>\n\n\n\n C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n T\u00ednh t\u1ed5ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i b\u00e0i t\u1eadp: \u00c1p d\u1ee5ng l\u00fd thuy\u1ebft v\u1ec1 nguy\u00ean t\u1eafc c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u. \u0110\u1ed3ng th\u1eddi \u00e1p d\u1ee5ng linh ho\u1ea1t t\u01b0 duy \u0111\u1ec3 t\u00ednh nhanh b\u00e0i t\u1eadp c\u0169ng nh\u01b0 x\u00e1c \u0111\u1ecbnh d\u1ea5u c\u1ee7a k\u1ebft qu\u1ea3 cu\u1ed1i c\u00f9ng.<\/p>\n\n\n\n B\u00e0i to\u00e1n c\u00f3 d\u1ea1ng t\u1ed5ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i b\u00e0i t\u1eadp: V\u1edbi nh\u1eefng b\u00e0i t\u1eadp \u0111\u01b0a v\u1ec1 d\u1ea1ng ph\u00e9p c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u. C\u00e1c y\u00eau c\u1ea7u c\u1ee7a b\u00e0i to\u00e1n r\u1ea5t \u0111a d\u1ea1ng. \u0110\u00f2i h\u1ecfi nhi\u1ec1u t\u01b0 duy v\u00e0 \u0111\u1ea7u t\u01b0 h\u01a1n v\u1ec1 th\u1eddi gian. V\u1eady n\u00ean, ta ph\u1ea3i c\u0103n c\u1ee9, b\u00e1m s\u00e1t v\u00e0o \u0111\u1ec1 b\u00e0i. Gi\u1ea3i quy\u1ebft l\u1ea7n l\u01b0\u1ee3t t\u1eebng y\u00eau c\u1ea7u c\u1ee7a \u0111\u1ec1 b\u00e0i.<\/p>\n\n\n\n V\u00ed d\u1ee5: B\u00e0i t\u1eadp t\u00ednh v\u00e0 \u0111\u01b0a ra nh\u1eadn x\u00e9t v\u1ec1 k\u1ebft qu\u1ea3<\/p>\n\n\n\n 4823 + (-5546) v\u00e0 (-4823) + 5546<\/p>\n\n\n\n \u2013 1212 + 1212 v\u00e0 7284 + (-7284)<\/p>\n\n\n\n Gi\u1ea3i b\u00e0i t\u1eadp tr\u00ean, ta c\u00f3:<\/p>\n\n\n\n \u0110\u1ea7u ti\u00ean, theo y\u00eau c\u1ea7u c\u1ee7a \u0111\u1ec1 b\u00e0i, ta ph\u1ea3i t\u00ednh ra k\u1ebft qu\u1ea3 c\u1ee7a c\u00e1c ph\u00e9p c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u. Sau \u0111\u00f3, d\u1ef1a v\u00e0o k\u1ebft qu\u1ea3 v\u1eeba t\u00ecm \u0111\u01b0\u1ee3c, ti\u1ebfn h\u00e0nh so s\u00e1nh \u0111\u1ed1i chi\u1ebfu. V\u00e0 r\u00fat ra m\u1ed9t nh\u1eadn x\u00e9t chung, c\u00f3 t\u00ednh kh\u00e1i qu\u00e1t nh\u1ea5t.<\/p>\n\n\n\n C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n C\u00f3 th\u1ec3 tr\u00ecnh b\u00e0y l\u1eddi gi\u1ea3i nh\u01b0 sau:<\/p>\n\n\n\n 4823 + (-5546) = -723<\/p>\n\n\n\n -4823 + 5546 = 723<\/p>\n\n\n\n V\u1eady, ta c\u00f3: Khi d\u1ea5u c\u1ee7a hai s\u1ed1 h\u1ea1ng trong m\u1ed9t t\u1ed5ng \u0111\u1ec1u thay \u0111\u1ed5i th\u00ec d\u1ea5u c\u1ee7a t\u1ed5ng c\u0169ng thay \u0111\u1ed5i.<\/p>\n\n\n\n -1212 +1212 = 0<\/p>\n\n\n\n 7284 + (-7284) = 0<\/p>\n\n\n\n Ta c\u00f3 nh\u1eadn x\u00e9t: T\u1ed5ng c\u1ee7a hai s\u1ed1 nguy\u00ean \u0111\u1ed1i nhau c\u00f3 k\u1ebft qu\u1ea3 b\u1eb1ng 0.<\/p>\n\n\n\n B\u00e0i t\u1eadp t\u00ecm x ho\u1eb7c b\u00e0i t\u1eadp \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o \u00f4 tr\u1ed1ng<\/p>\n\n\n\n C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n Hai d\u1ea1ng b\u00e0i t\u1eadp: t\u00ecm x v\u00e0 \u0111i\u1ec1n s\u1ed1 tuy tr\u00ecnh b\u00e0y kh\u00e1c nhau. Nh\u01b0ng v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 gi\u1ed1ng nhau v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p l\u00e0m b\u00e0i.<\/p>\n\n\n\n Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i b\u00e0i t\u1eadp: d\u1ef1a v\u00e0o m\u1ed1i quan h\u1ec7, s\u1ef1 li\u00ean k\u1ebft gi\u1eefa c\u00e1c s\u1ed1 h\u1ea1ng trong m\u1ed9t t\u1ed5ng. \u0110\u1ed3ng th\u1eddi, t\u1eeb nguy\u00ean t\u1eafc c\u1ed9ng hai s\u1ed1 nguy\u00ean. T\u00ecm ra gi\u00e1 tr\u1ecb th\u00edch h\u1ee3p c\u1ee7a bi\u1ec3u th\u1ee9c. Sau \u0111\u00f3, tr\u00ecnh b\u00e0y l\u1ea1i theo d\u1ea1ng b\u00e0i t\u1eadp \u0111\u1ec1 b\u00e0i y\u00eau c\u1ea7u.<\/p>\n\n\n\n V\u00ed d\u1ee5 1: B\u00e0i t\u1eadp t\u00ecm x:<\/p>\n\n\n\n 182 + x = -425<\/p>\n\n\n\n L\u1eddi gi\u1ea3i: ta c\u00f3: 182 + x = \u2013 425<\/p>\n\n\n\n x = -425 \u2013 182<\/p>\n\n\n\n x = -607<\/p>\n\n\n\n V\u1eady, x = -607<\/p>\n\n\n\n V\u00ed d\u1ee5 2: B\u00e0i t\u1eadp \u0111i\u1ec1n s\u1ed1 th\u00edch h\u1ee3p v\u00e0o ch\u1ed7 tr\u1ed1ng<\/p>\n\n\n\n a 682 -448 \u2026 688<\/p>\n\n\n\n b \u2026 \u2026 977 -52<\/p>\n\n\n\n a + b 637 -362 452 \u2026<\/p>\n\n\n\n L\u1eddi gi\u1ea3i:<\/p>\n\n\n\n a 682 -448 -525 688<\/p>\n\n\n\n b -45 86 977 -52<\/p>\n\n\n\n a + b 637 -362 452 636<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp s\u00e1ch gi\u00e1o khoa<\/p>\n\n\n\n B\u00ed quy\u1ebft c\u01a1 b\u1ea3n \u0111\u1ec3 c\u00e1c con h\u1ecdc t\u1eadp<\/a> hi\u1ec7u qu\u1ea3<\/p>\n\n\n\n V\u1edbi th\u1ef1c tr\u1ea1ng ch\u01b0\u01a1ng tr\u00ecnh gi\u00e1o d\u1ee5c v\u00e0 s\u1ef1 \u0111\u1eb7t n\u1eb7ng c\u00e1c v\u1ea5n \u0111\u1ec1 li\u00ean quan t\u1edbi thi c\u1eed, ki\u1ec3m tra,\u2026 H\u1ecdc sinh<\/a> th\u01b0\u1eddng xuy\u00ean r\u01a1i v\u00e0o t\u00ecnh tr\u1ea1ng \u00e1p l\u1ef1c. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 t\u00e2m l\u00fd? Vietlearn g\u1eedi \u0111\u1ebfn ba m\u1eb9 v\u00e0 b\u00e9 2 b\u00ed quy\u1ebft c\u0103n b\u1ea3n \u0111\u1ec3 c\u00f3 th\u1ec3 h\u1ecdc t\u1eadp<\/a>, r\u00e8n luy\u1ec7n hi\u1ec7u qu\u1ea3.<\/p>\n\n\n\n X\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ed9ng c\u01a1 h\u1ecdc t\u1eadp<\/a> r\u00f5 r\u00e0ng<\/p>\n\n\n\n M\u1ed9t trong nhi\u1ec1u l\u00fd do khi\u1ebfn tr\u1ebb h\u1ecdc k\u00e9m l\u00e0 do kh\u00f4ng c\u00f3 \u0111\u1ed9ng l\u1ef1c. Ng\u01b0\u1eddi ta th\u01b0\u1eddng n\u00f3i: \u0111\u1ed9ng l\u1ef1c l\u00e0 s\u1ee9c m\u1ea1nh gi\u00fap ta ph\u00e1t tri\u1ec3n. \u0110\u1ed1i v\u1edbi vi\u1ec7c h\u1ecdc c\u0169ng kh\u00f4ng ngo\u1ea1i l\u1ec7. Con c\u1ea7n \u0111\u01b0\u1ee3c ba m\u1eb9, th\u1ea7y c\u00f4 v\u00e0 nh\u00e0 tr\u01b0\u1eddng quan t\u00e2m nhi\u1ec1u h\u01a1n. H\u00e3y gi\u00fap con hi\u1ec3u \u0111\u01b0\u1ee3c t\u1ea7m quan tr\u1ecdng c\u1ee7a vi\u1ec7c h\u1ecdc. T\u00ecm ra \u0111\u01b0\u1ee3c \u0111\u1ed9ng c\u01a1 h\u1ecdc t\u1eadp<\/a> c\u00f3 th\u1ec3 gi\u00fap con th\u00eam c\u1ed1 g\u1eafng, n\u1ed7 l\u1ef1c \u0111\u1ec3 theo \u0111u\u1ed5i nh\u1eefng m\u1ee5c ti\u00eau \u0111\u01b0\u1ee3c b\u1ea3n th\u00e2n \u0111\u1ec1 ra. C\u00e1c nh\u00e0 t\u00e2m l\u00fd h\u1ecdc \u0111a s\u1ed1 cho r\u1eb1ng h\u1ecdc t\u1eadp<\/a> t\u1ed1t ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o th\u00e1i \u0111\u1ed9 h\u1ecdc t\u1eadp. M\u00e0 trong \u0111\u00f3, \u0111\u1ed9ng c\u01a1 h\u1ecdc t\u1eadp l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng nh\u1ea5t.<\/p>\n\n\n\n X\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ed9ng c\u01a1 h\u1ecdc t\u1eadp r\u00f5 r\u00e0ng<\/p>\n\n\n\n X\u00e2y d\u1ef1ng ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc t\u1eadp hi\u1ec7u qu\u1ea3<\/p>\n\n\n\n \u0110\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng ngay sau b\u01b0\u1edbc t\u00ecm \u0111\u1ed9ng c\u01a1 v\u00e0 th\u00e1i \u0111\u1ed9 h\u1ecdc t\u1eadp t\u00edch c\u1ef1c. X\u00e2y d\u1ef1ng ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc t\u1eadp l\u00e0 m\u1ed9t c\u00e1ch \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh ph\u01b0\u01a1ng ph\u00e1p t\u01b0 duy. N\u00ean c\u0103n c\u1ee9 v\u00e0o n\u0103ng l\u1ef1c ti\u1ebfp thu v\u00e0 h\u1ecdc t\u1eadp c\u1ee7a b\u1ea3n th\u00e2n. X\u00e2y d\u1ef1ng ri\u00eang cho m\u00ecnh m\u1ed9t k\u1ebf ho\u1ea1ch, m\u1ed9t th\u1eddi gian bi\u1ec3u h\u1ee3p l\u00fd. K\u00edch th\u00edch t\u01b0 duy v\u00e0 kh\u1eafc s\u00e2u ki\u1ebfn th\u1ee9c cho tr\u1ebb.<\/p>\n\n\n\n M\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p \u0111\u1ec3 h\u1ecdc t\u1eadp hi\u1ec7u qu\u1ea3<\/p>\n\n\n\n \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. H\u1ecdc sinh c\u1ea7n coi tr\u1ecdng vi\u1ec7c ghi nh\u1edb ki\u1ebfn th\u1ee9c.<\/p>\n\n\n\n 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, toppy 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 h\u1ecdc t\u1eadp 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 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 \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 \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 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 Ghi ch\u00e9p<\/p>\n\n\n\n B\u00ean c\u1ea1nh vi\u1ec7c ghi nh\u1edb b\u1eb1ng c\u00e1ch t\u1ed5ng h\u1ee3p sau \u0111\u00f3 ch\u1ec9 nh\u00ecn v\u00e0 \u0111\u1ecdc. Ta n\u00ean k\u1ebft h\u1ee3p v\u1edbi ng\u00f4n ng\u1eef b\u1eb1ng c\u00e1ch ghi ch\u00e9p. Vi\u1ec7c ghi l\u1ea1i nh\u1eefng g\u00ec h\u1ecdc sinh suy ngh\u0129 \u0111\u01b0\u1ee3c ra gi\u1ea5y s\u1ebd l\u00e0 \u0111i\u1ec1u ki\u1ec7n t\u1ed1t \u0111\u1ec3 c\u1ea3i thi\u1ec7n tr\u00ed n\u00e3o cho tr\u1ebb. S\u1eafp x\u1ebfp cho con m\u1ed9t t\u01b0 duy logic. C\u00f3 kh\u1ea3 n\u0103ng t\u00ecm ra l\u1ed7i sai c\u1ee7a ch\u00ednh m\u00ecnh v\u00e0 h\u01a1n h\u1ebft l\u00e0 trong khi ghi ch\u00e9p, h\u1ecdc sinh c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n l\u1ea1i ph\u1ea7n t\u1ed5ng h\u1ee3p tr\u01b0\u1edbc \u0111\u00f3. B\u1ecf \u0111i nh\u1eefng ph\u1ea7n kh\u00f4ng quan tr\u1ecdng trong ti\u1ebfn tr\u00ecnh h\u1ecdc t\u1eadp.<\/p>\n\n\n\n L\u1eddi k\u1ebft:<\/p>\n\n\n\n V\u1ec1 d\u1ea1ng b\u00e0i t\u1eadp c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u, toppy \u0111\u00e3 t\u1ed5ng h\u1ee3p m\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c l\u00fd thuy\u1ebft, b\u00e0i t\u1eadp. C\u0169ng nh\u01b0 nh\u1eefng l\u1eddi khuy\u00ean b\u1ed5 \u00edch d\u00e0nh cho c\u00e1c b\u1ea1n h\u1ecdc sinh v\u00e0 ph\u1ee5 huynh. Vietlearn mong r\u1eb1ng nh\u1eefng chia s\u1ebb c\u1ee7a m\u00ecnh c\u00f3 th\u1ec3 mang t\u1edbi nh\u1eefng gi\u00e1 tr\u1ecb trong qu\u00e1 tr\u00ecnh h\u1ecdc t\u1eadp c\u1ee7a c\u00e1c con. Ch\u00fac c\u00e1c con h\u1ecdc t\u1ed1t!<\/p>\n\n\n\n <\/p>\n\n\n\n Quy t\u1eafc nh\u00e2n hai s\u1ed1 nguy\u00ean c\u00f9ng d\u1ea5u \u2013 chinh ph\u1ee5c to\u00e1n l\u1edbp 6<\/p>\n\n\n\n B\u00e0i gi\u1ea3ng chi ti\u1ebft quy t\u1eafc d\u1ea5u ngo\u1eb7c cho h\u1ecdc si<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":" Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn C\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u l\u00e0 ph\u1ea7n l\u00fd thuy\u1ebft v\u00e0 b\u00e0i t\u1eadp d\u1ec5 g\u00e2y nh\u1ea7m l\u1eabn cho h\u1ecdc sinh. \u0110\u1ec3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c v\u1ec1 c\u1ed9ng hai s\u1ed1 nguy\u00ean kh\u00e1c d\u1ea5u. M\u1eddi ba m\u1eb9 v\u00e0 c\u00e1c con t\u00ecm hi\u1ec3u qua b\u00e0i vi\u1ebft sau: Nguy\u00ean t\u1eafc c\u1ed9ng hai s\u1ed1 […]<\/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-2727","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\/2727","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=2727"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/2727\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=2727"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=2727"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=2727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}