Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
Trong cu\u1ed9c s\u1ed1ng, ch\u00fang ta th\u01b0\u1eddng \u0111\u01b0\u1ee3c nghe r\u1ea5t nhi\u1ec1u v\u1ec1 l\u1ef1c. L\u1ef1c m\u1ea1nh, l\u1ef1c y\u1ebfu, l\u1ef1c c\u00e2n b\u1eb1ng, l\u1ef1c n\u00e2ng, l\u1ef1c k\u00e9o. Ch\u1eafc h\u1eb3n nh\u1eefng c\u1ee5m t\u1eeb n\u00e0y \u0111\u00e3 r\u1ea5t quen v\u1edbi ch\u00fang ta. Nh\u01b0ng c\u00f3 th\u1ec3 ch\u00fang ta l\u1ea1i ch\u01b0a hi\u1ec3u r\u00f5 v\u1ec1 l\u1ef1c l\u00e0 g\u00ec? Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 nh\u01b0 th\u1ebf n\u00e0o? Trong ch\u01b0\u01a1ng tr\u00ecnh s\u00e1ch gi\u00e1o khoa v\u1eadt l\u00fd l\u1edbp 6, c\u00e1c em \u0111\u00e3 \u0111\u01b0\u1ee3c ti\u1ebfp c\u1eadn v\u00e0 h\u1ecdc v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y. B\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay, ch\u00fang t\u00f4i s\u1ebd \u0111em \u0111\u1ebfn nh\u1eefng ki\u1ebfn th\u1ee9c, nh\u1eefng \u0111i\u1ec1u c\u1ea7n bi\u1ebft, \u1ee9ng d\u1ee5ng v\u1ec1 \u0111i\u1ec1u n\u00e0y nh\u00e9!<\/p>\n\n\n\n
L\u1ef1c l\u00e0 g\u00ec?<\/p>\n\n\n\n
Tr\u01b0\u1edbc khi \u0111\u1ebfn v\u1edbi c\u00e1c lo\u1ea1i l\u1ef1c, ch\u00fang ta c\u1ea7n hi\u1ec3u v\u1ec1 kh\u00e1i ni\u1ec7m L\u1ef1c l\u00e0 g\u00ec. L\u1ef1c \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch v\u00f4 c\u00f9ng \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ec5 hi\u1ec3u. Khi v\u1eadt n\u00e0y k\u00e9o, ho\u1eb7c \u0111\u1ea9y v\u1eadt kia th\u00ec ta n\u00f3i v\u1eadt n\u00e0y t\u00e1c d\u1ee5ng l\u1ef1c l\u00ean v\u1eadt kia. T\u00e1c d\u1ee5ng \u0111\u1ea9y hay k\u00e9o c\u1ee7a v\u1eadt n\u00e0y l\u00ean m\u1ed9t v\u1eadt kh\u00e1c \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1ef1c. Ch\u00fang ta c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01a1n gi\u1ea3n khi ch\u00fang ta k\u00e9o hay \u0111\u1ea9y m\u1ed9t v\u1eadt, ch\u00ednh l\u00e0 ta t\u00e1c d\u1ee5ng l\u1ef1c l\u00ean v\u1eadt \u0111\u00f3. C\u00f3 r\u1ea5t nhi\u1ec1u \u1ee9ng d\u1ee5ng v\u1ec1 l\u1ef1c trong cu\u1ed9c s\u1ed1ng. V\u00e0 h\u1ea7u h\u1ebft m\u1ecdi ho\u1ea1t \u0111\u1ed9ng \u0111\u1ec1u c\u00f3 s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a l\u1ef1c. Khi c\u00e1c em \u0111\u00e3 hi\u1ec3u v\u1ec1 l\u1ef1c, th\u00ec c\u00e1c em c\u00f3 th\u1ec3 t\u1ef1 ph\u00e2n t\u00edch \u0111\u01b0\u1ee3c c\u00e1c l\u1ef1c xu\u1ea5t hi\u1ec7n.<\/p>\n\n\n\n
X\u00e1c \u0111\u1ecbnh l\u1ef1c<\/p>\n\n\n\n
M\u1ed7i l\u1ef1c t\u00e1c d\u1ee5ng \u0111\u1ec1u \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi ph\u01b0\u01a1ng, chi\u1ec1u, \u0111\u1ed9 l\u1edbn (hay c\u00f2n g\u1ecdi l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a l\u1ef1c). Ph\u01b0\u01a1ng, chi\u1ec1u l\u00e0 nh\u1eefng \u0111i\u1ec1u c\u00e1c em \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm hi\u1ec3u trong To\u00e1n h\u1ecdc. Ph\u01b0\u01a1ng c\u00f3 th\u1ec3 l\u00e0 ph\u01b0\u01a1ng n\u1eb1m ngang, ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, ph\u01b0\u01a1ng xi\u00ean. Chi\u1ec1u th\u00ec c\u00f3 th\u1ec3 t\u1eeb d\u01b0\u1edbi l\u00ean tr\u00ean, t\u1eeb tr\u00ean xu\u1ed1ng d\u01b0\u1edbi, t\u1eeb tr\u00e1i sang ph\u1ea3i hay ph\u1ea3i sang tr\u00e1i. Tuy nhi\u00ean, \u0111\u1ed1i v\u1edbi c\u00e1c em l\u1edbp 6 th\u00ec ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c th\u01b0\u1eddng s\u1ebd \u0111\u01b0\u1ee3c ti\u1ebfp c\u1eadn l\u00e0 ph\u01b0\u01a1ng n\u1eb1m ngang, v\u00e0 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. Hai l\u1ef1c c\u00e2n b\u1eb1ng c\u0169ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi nh\u1eefng \u0111i\u1ec1u n\u00e0y.<\/p>\n\n\n\n
V\u00ed d\u1ee5 th\u1ef1c t\u1ebf v\u1ec1 hai l\u1ef1c c\u00f3 c\u00f9ng \u0111\u1ed9 l\u1edbn<\/p>\n\n\n\n
Khi c\u00e1c em \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u v\u1ec1 x\u00e1c \u0111\u1ecbnh l\u1ef1c, c\u00e1c em c\u1ea7n ph\u1ea3i x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng chi\u1ec1u, \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c. \u0110\u00e2y c\u0169ng ch\u00ednh l\u00e0 nh\u1eefng y\u00eau c\u1ea7u c\u00e1c em ph\u1ea3i th\u1ef1c hi\u1ec7n trong c\u00e1c b\u00e0i t\u1eadp tr\u00ean l\u1edbp. Khi c\u00f3 b\u00e0i t\u1eadp y\u00eau c\u1ea7u v\u1ec1 x\u00e1c \u0111\u1ecbnh hai l\u1ef1c c\u00e2n b\u1eb1ng, c\u00e1c em s\u1ebd ph\u1ea3i x\u00e1c \u0111\u1ecbnh ph\u01b0\u01a1ng chi\u1ec1u \u0111\u1ed9 l\u1edbn c\u1ee7a c\u1eb7p l\u1ef1c n\u00e0y. ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u th\u00eam hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 g\u00ec \u0111\u1ec3 hi\u1ec3u th\u00eam v\u1ec1 \u0111i\u1ec1u n\u00e0y nh\u00e9!<\/p>\n\n\n\n
Tham kh\u1ea3o th\u00eam \u0110\u01a1n v\u1ecb \u0111o kh\u1ed1i l\u01b0\u1ee3ng<\/p><\/blockquote>\n\n\n\n
K\u1ebft qu\u1ea3 t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c<\/p>\n\n\n\n
Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 g\u00ec?<\/p>\n\n\n\n
Nh\u01b0 ch\u00fang ta \u0111\u00e3 bi\u1ebft \u1edf tr\u00ean, l\u1ef1c xu\u1ea5t hi\u1ec7n khi v\u1eadt n\u00e0y t\u00e1c d\u1ee5ng k\u00e9o ho\u1eb7c \u0111\u1ea9y l\u00ean v\u1eadt kh\u00e1c. Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 hai l\u1ef1c c\u00f9ng t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt, c\u00f3 \u0111\u1ed9 l\u1edbn b\u1eb1ng nhau. Ph\u01b0\u01a1ng c\u1ee7a hai l\u1ef1c n\u00e0y gi\u1ed1ng nhau, c\u00f3 th\u1ec3 l\u00e0 c\u00f9ng n\u1eb1m ngang ho\u1eb7c th\u1eb3ng \u0111\u1ee9ng. Chi\u1ec1u c\u1ee7a hai l\u1ef1c c\u00e2n b\u1eb1ng tr\u00e1i ng\u01b0\u1ee3c nhau. Ch\u00fang ta c\u00f3 th\u1ec3 hi\u1ec3u r\u1eb1ng, khi hai l\u1ef1c c\u00e2n b\u1eb1ng t\u00e1c d\u1ee5ng l\u00ean m\u1ed9t v\u1eadt th\u00ec v\u1eadt \u0111\u00f3 s\u1ebd kh\u00f4ng di chuy\u1ec3n. C\u00f3 r\u1ea5t nhi\u1ec1u nh\u1eefng \u1ee9ng d\u1ee5ng trong th\u1ef1c t\u1ebf th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c hai l\u1ef1c n\u00e0y.<\/p>\n\n\n\n
C\u00e1ch \u0111o hai l\u1ef1c c\u00f3 c\u00f9ng \u0111\u1ed9 l\u1edbn nh\u01b0 th\u1ebf n\u00e0o<\/p>\n\n\n\n
V\u00ed d\u1ee5 v\u1ec1 l\u1ef1c c\u00e2n b\u1eb1ng<\/p>\n\n\n\n
M\u1ed9t v\u00ed d\u1ee5 v\u00f4 c\u00f9ng d\u1ec5 hi\u1ec3u ch\u00fang ta th\u01b0\u1eddng th\u1ea5y \u0111\u00f3 ch\u00ednh l\u00e0 hai \u0111\u1ed9i thi k\u00e9o co c\u00f9ng nhau. Hai \u0111\u1ed9i c\u00f9ng nhau t\u00e1c d\u1ee5ng l\u1ef1c k\u00e9o l\u00ean chi\u1ebfc d\u00e2y. N\u1ebfu \u0111i\u1ec3m gi\u1eefa c\u1ee7a chi\u1ebfc d\u00e2y kh\u00f4ng di chuy\u1ec3n, gi\u1eef nguy\u00ean t\u1ea1i \u0111i\u1ec3m \u0111\u00e1nh d\u1ea5u. Th\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 khi hai l\u1ef1c \u0111ang t\u00e1c d\u1ee5ng l\u00ean d\u00e2y m\u1ed9t l\u1ef1c k\u00e9o nh\u01b0 nhau. Ta n\u00f3i l\u1ef1c k\u00e9o c\u1ee7a hai \u0111\u1ed9i l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng.<\/p>\n\n\n\n
Trong th\u1ef1c t\u1ebf, m\u1ecdi v\u1eadt \u0111\u1ec1u ch\u1ecbu m\u1ed9t l\u1ef1c h\u00fat t\u1eeb tr\u00e1i \u0111\u1ea5t hay c\u00f2n g\u1ecdi l\u00e0 tr\u1ecdng l\u1ef1c. Ch\u00ednh v\u00ec v\u1eady, ngay c\u1ea3 khi m\u1ed9t v\u1eadt \u0111\u1ee9ng y\u00ean, v\u00ed d\u1ee5 nh\u01b0 quy\u1ec3n s\u00e1ch \u0111\u1eb7t tr\u00ean m\u1eb7t b\u00e0n. Th\u00ec quy\u1ec3n s\u00e1ch n\u00e0y c\u0169ng \u0111ang ch\u1ecbu hai l\u1ef1c c\u00e2n b\u1eb1ng \u0111\u00f3 l\u00e0 tr\u1ecdng l\u1ef1c v\u00e0 l\u1ef1c n\u00e2ng t\u1eeb m\u1eb7t b\u00e0n. Ngay c\u1ea3 con ng\u01b0\u1eddi ch\u00fang ta c\u0169ng ch\u1ecbu l\u1ef1c h\u00fat t\u1eeb tr\u00e1i \u0111\u1ea5t. \u0110\u00e2y s\u1ebd l\u00e0 \u0111i\u1ec1u c\u00e1c em \u0111\u01b0\u1ee3c bi\u1ebft trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd l\u1edbp 6.<\/p>\n\n\n\n
C\u00e1c nh\u1eadn bi\u1ebft m\u1ed9t v\u1eadt c\u00f3 l\u1ef1c t\u00e1c d\u1ee5ng<\/p>\n\n\n\n
M\u1ed9t trong nh\u1eefng d\u1ea5u hi\u1ec7u r\u00f5 nh\u1ea5t th\u1ec3 hi\u1ec7n v\u1eadt \u0111ang \u0111\u01b0\u1ee3c t\u00e1c d\u1ee5ng l\u1ef1c ch\u00ednh l\u00e0 khi v\u1eadt bi\u1ebfn d\u1ea1ng. Ngo\u00e0i ra, n\u1ebfu v\u1eadt b\u1ecb thay \u0111\u1ed5i v\u1ec1 chuy\u1ec3n \u0111\u1ed9ng th\u00ec c\u0169ng c\u00f3 ngh\u0129a l\u00e0 v\u1eadt \u0111ang \u0111\u01b0\u1ee3c t\u00e1c d\u1ee5ng l\u1ef1c. M\u1ed9t v\u1eadt c\u00f3 th\u1ec3 ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a nhi\u1ec1u l\u1ef1c kh\u00e1c nhau. Khi \u0111\u00f3, ch\u00fang ta c\u1ea7n ph\u1ea3i x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng chi\u1ec1u, \u0111\u1ed9 l\u1edbn c\u1ee7a t\u1eebng l\u1ef1c. Sau \u0111\u00f3, ch\u00fang ta c\u00f3 th\u1ec3 nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c l\u1ef1c n\u00e0o l\u00e0 l\u1ef1c k\u00e9o, l\u1ef1c \u0111\u1ea9y, l\u1ef1c h\u00fat hay l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng.<\/p>\n\n\n\n
C\u00e1ch \u0111o hai l\u1ef1c c\u00f9ng \u0111\u1ed9 l\u1edbn nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n\n\n\n
Ch\u00fang ta c\u00f3 th\u1ec3 v\u00ed d\u1ee5 v\u1ec1 m\u1ed9t tr\u00e1i b\u00f3ng \u0111ang \u0111\u1ee9ng y\u00ean tr\u00ean s\u00e2n. Khi c\u00f3 m\u1ed9t c\u1ea7u th\u1ee7 \u0111\u00e1 v\u00e0o tr\u00e1i b\u00f3ng, tr\u00e1i b\u00f3ng di chuy\u1ec3n. Th\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 tr\u00e1i b\u00f3ng \u0111ang b\u1ecb t\u00e1c d\u1ee5ng m\u1ed9t l\u1ef1c \u0111\u1ea9y d\u1eabn \u0111\u1ebfn thay \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng. Ho\u1eb7c \u0111\u01a1n gi\u1ea3n h\u01a1n, khi c\u00e1c \u0111\u1ea7u b\u1ebfp l\u00e0m b\u00e1nh. B\u1ed9t m\u00ec \u0111\u01b0\u1ee3c nh\u00e0o n\u1eb7n. C\u1ee5c b\u1ed9t m\u00ec b\u1ecb \u1ea5n bi\u1ebfn d\u1ea1ng thay \u0111\u1ed5i so v\u1edbi l\u00fac \u0111\u1ea7u. Th\u00ec c\u00f3 ngh\u0129a l\u00e0 c\u00e1c \u0111\u1ea7u b\u1ebfp \u0111ang t\u00e1c d\u1ee5ng m\u1ed9t l\u1ef1c \u1ea5n l\u00e0m cho c\u1ee5c b\u1ed9t b\u1ecb bi\u1ebfn d\u1ea1ng. Khi c\u00f3 m\u1ed9t v\u1eadt n\u00e0o n\u00f3 \u0111\u1ee9ng y\u00ean, kh\u00f4ng chuy\u1ec3n \u0111\u1ed9ng, th\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 v\u1eadt ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a c\u00e1c l\u1ef1c ho\u1eb7c hai l\u1ef1c c\u00e2n b\u1eb1ng.<\/p>\n\n\n\n
X\u00e1c \u0111\u1ecbnh ph\u01b0\u01a1ng v\u00e0 chi\u1ec1u c\u1ee7a l\u1ef1c<\/p>\n\n\n\n
\u0110\u1ec3 c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh ph\u01b0\u01a1ng v\u00e0 chi\u1ec1u c\u1ee7a l\u1ef1c, ch\u00fang ta c\u1ea7n ph\u1ea3i d\u1ef1a v\u00e0o nh\u1eefng k\u1ebft qu\u1ea3 t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c l\u00ean v\u1eadt. Khi ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c, v\u1eadt b\u1ecb t\u00e1c \u0111\u1ed9ng bi\u1ebfn d\u1ea1ng theo ph\u01b0\u01a1ng, chi\u1ec1u n\u00e0o. Th\u00ec \u0111\u00f3 s\u1ebd l\u00e0 ph\u01b0\u01a1ng chi\u1ec1u c\u1ee7a l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt \u0111\u00f3. Khi ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c, v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng b\u1ecb thay \u0111\u1ed5i chuy\u1ec3n \u0111\u1ed9ng b\u1ea5t k\u1ef3 (nhanh d\u1ea7n hay ch\u1eadm d\u1ea7n hay thay \u0111\u1ed5i h\u01b0\u1edbng). T\u00f9y v\u00e0o t\u1eebng tr\u01b0\u1eddng h\u1ee3p c\u1ee5 th\u1ec3, ch\u00fang ta x\u00e1c \u0111\u1ecbnh ph\u01b0\u01a1ng chi\u1ec1u c\u1ee7a l\u1ef1c t\u00e1c d\u1ee5ng.<\/p>\n\n\n\n
Hai l\u1ef1c c\u00e2n b\u1eb1ng s\u1ebd c\u00f3 ph\u01b0\u01a1ng gi\u1ed1ng nhau, chi\u1ec1u ng\u01b0\u1ee3c nhau v\u00e0 c\u00f9ng \u0111\u1ed9 l\u1edbn. V\u00ec v\u1eady, khi x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c m\u1ed9t l\u1ef1c trong c\u1eb7p l\u1ef1c n\u00e0y th\u00ec ta c\u00f3 th\u1ec3 suy ra \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a l\u1ef1c c\u00f2n l\u1ea1i. Tuy nhi\u00ean, trong c\u00e1ch tr\u01b0\u1eddng h\u1ee3p, ch\u00fang ta v\u1eabn ph\u1ea3i xem x\u00e9t k\u1ebft qu\u1ea3 t\u00e1c d\u1ee5ng l\u1ef1c k\u1ef9 l\u01b0\u1ee1ng m\u1edbi c\u00f3 th\u1ec3 kh\u1eb3ng \u0111\u1ecbnh \u0111i\u1ec1u n\u00e0y. V\u00ec m\u1ed9t v\u1eadt c\u00f3 th\u1ec3 ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a nhi\u1ec1u h\u01a1n 2 l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean n\u00f3.<\/p>\n\n\n\n
C\u00e1ch x\u00e1c \u0111\u1ecbnh hai l\u1ef1c c\u00e2n b\u1eb1ng<\/p>\n\n\n\n
\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh hai l\u1ef1c c\u00e2n b\u1eb1ng, ch\u00fang ta ph\u1ea3i x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u1ee7 4 y\u1ebfu t\u1ed1 sau \u0111\u00e2y:<\/p>\n\n\n\n
Hai l\u1ef1c ph\u1ea3i c\u00f9ng t\u00e1c d\u1ee5ng l\u00ean c\u00f9ng m\u1ed9t v\u1eadt.<\/p>\n\n\n\n
Ph\u01b0\u01a1ng c\u1ee7a hai l\u1ef1c ph\u1ea3i n\u1eb1m tr\u00ean c\u00f9ng m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng. Hay ta c\u00f2n n\u00f3i l\u00e0 hai l\u1ef1c c\u00f3 c\u00f9ng ph\u01b0\u01a1ng v\u1edbi nhau.<\/p>\n\n\n\n
Chi\u1ec1u c\u1ee7a hai l\u1ef1c ph\u1ea3i ng\u01b0\u1ee3c chi\u1ec1u nhau.<\/p>\n\n\n\n
\u0110\u1ed9 l\u1edbn c\u1ee7a hai l\u1ef1c l\u00e0 b\u1eb1ng nhau.<\/p>\n\n\n\n
C\u00e1c d\u1ea1ng bi\u1ec3u di\u1ec5n hai l\u1ef1c c\u00e2n b\u1eb1ng<\/p>\n\n\n\n
N\u1ebfu thi\u1ebfu trong 4 \u0111i\u1ec1u ki\u1ec7n tr\u00ean th\u00ec hai l\u1ef1c \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh kh\u00f4ng ph\u1ea3i hai l\u1ef1c c\u00e2n b\u1eb1ng. C\u00f3 nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng ph\u1ea3i l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng d\u00f9 hai l\u1ef1c c\u00f9ng t\u00e1c d\u1ee5ng l\u00ean 1 v\u1eadt. Khi v\u1eadt n\u00e0y t\u00e1c d\u1ee5ng l\u00ean v\u1eadt kia m\u1ed9t l\u1ef1c, th\u00ec \u1edf v\u1eadt kia c\u0169ng t\u00e1c d\u1ee5ng ng\u01b0\u1ee3c l\u1ea1i m\u1ed9t l\u1ef1c. Tuy nhi\u00ean, \u0111\u1ed9 l\u1edbn hay ph\u01b0\u01a1ng chi\u1ec1u c\u1ee7a c\u00e1c l\u1ef1c n\u00e0y \u0111\u1ec1u kh\u00f4ng \u0111\u1ea3m b\u1ea3o. Ch\u00ednh v\u00ec v\u1eady, \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng ch\u00fang ta c\u1ea7n x\u00e1c \u0111\u1ecbnh.<\/p>\n\n\n\n
V\u00ed d\u1ee5 v\u1ec1 l\u1ef1c c\u00e2n b\u1eb1ng trong th\u1ef1c t\u1ebf<\/p>\n\n\n\n
M\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p kh\u00e1c, kh\u00f4ng ph\u1ea3i c\u1ee9 hai v\u1eadt ch\u1ea1m v\u00e0o nhau m\u1edbi l\u00e0 t\u00e1c d\u1ee5ng l\u1ef1c l\u00ean nhau. C\u00f3 m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p trong th\u1ef1c t\u1ebf, hai v\u1eadt kh\u00f4ng c\u1ea7n ch\u1ea1m v\u00e0o nhau nh\u01b0ng v\u1eabn c\u00f3 th\u1ec3 t\u00e1c d\u1ee5ng l\u1ef1c. V\u00ed d\u1ee5 nh\u01b0 l\u1ef1c h\u00fat c\u1ee7a nam ch\u00e2m t\u00e1c d\u1ee5ng l\u00ean thanh s\u1eaft. D\u00f9 thanh s\u1eaft kh\u00f4ng ch\u1ea1m th\u00ec nam ch\u00e2m v\u1eabn \u0111ang t\u00e1c d\u1ee5ng 1 l\u1ef1c h\u00fat l\u00ean thanh s\u1eaft.<\/p>\n\n\n\n
Hai l\u1ef1c c\u00e2n b\u1eb1ng d\u1ec5 hi\u1ec3u nh\u1ea5t ch\u00ednh l\u00e0 khi ch\u00fang ta \u0111\u1eb7t m\u1ed9t v\u1eadt nh\u01b0 c\u00e1i c\u1ed1c, quy\u1ec3n s\u00e1ch tr\u00ean m\u1eb7t b\u00e0n. C\u1ed1c kh\u00f4ng di chuy\u1ec3n th\u00ec l\u00fac n\u00e0y hai l\u1ef1c \u0111ang t\u00e1c d\u1ee5ng l\u00ean chi\u1ebfc c\u1ed1c l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng. Quy\u1ec3n s\u00e1ch c\u0169ng l\u00e0 m\u1ed9t v\u00ed d\u1ee5 nh\u01b0 v\u1eady. \u0110\u00e2y l\u00e0 v\u00ed d\u1ee5 d\u1ec5 hi\u1ec3u nh\u1ea5t d\u00e0nh cho c\u00e1c em.<\/p>\n\n\n\n
C\u00f3 th\u1ec3 n\u00f3i, hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 hai l\u1ef1c c\u1ea7n ph\u1ea3i x\u00e1c \u0111\u1ecbnh tr\u00ean nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n kh\u00e1c nhau. B\u00e0i vi\u1ebft c\u1ee7a ch\u00fang t\u00f4i \u0111\u00e3 \u0111em \u0111\u1ebfn cho c\u00e1c em nh\u1eefng ki\u1ebfn th\u1ee9c v\u1ec1 l\u1ef1c v\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng. Hy v\u1ecdng r\u1eb1ng b\u00e0i vi\u1ebft c\u1ee7a ch\u00fang t\u00f4i c\u00f3 th\u1ec3 gi\u00fap \u00edch cho c\u00e1c em trong vi\u1ec7c h\u1ecdc t\u1eadp<\/a>. Nh\u1eefng b\u00e0i t\u1eadp x\u00e1c \u0111\u1ecbnh l\u1ef1c c\u00e1c em s\u1ebd g\u1eb7p r\u1ea5t nhi\u1ec1u trong v\u1eadt l\u00fd 6. C\u00e1c em h\u00e3y h\u1ecdc thu\u1ed9c c\u00e1ch x\u00e1c \u0111\u1ecbnh \u0111\u1ec3 l\u00e0m b\u00e0i t\u1eadp d\u1ec5 d\u00e0ng h\u01a1n nh\u00e9!<\/p>\n\n\n\n
Xem th\u00eam c\u00e1c b\u00e0i vi\u1ebft c\u00f9ng ch\u1ee7 \u0111\u1ec1<\/p><\/blockquote>\n\n\n\n
L\u1ef1c k\u1ebf ph\u00e9p \u0111o l\u1ef1c tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng \u2013 V\u1eadt l\u00fd 6<\/p>\n\n\n\n
V\u1eadt l\u00fd 6: T\u00ecm hi\u1ec3u v\u1ec1 k\u1ebft qu\u1ea3 t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c?<\/p>\n\n\n\n
T\u00e1c d<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Trong cu\u1ed9c s\u1ed1ng, ch\u00fang ta th\u01b0\u1eddng \u0111\u01b0\u1ee3c nghe r\u1ea5t nhi\u1ec1u v\u1ec1 l\u1ef1c. L\u1ef1c m\u1ea1nh, l\u1ef1c y\u1ebfu, l\u1ef1c c\u00e2n b\u1eb1ng, l\u1ef1c n\u00e2ng, l\u1ef1c k\u00e9o. Ch\u1eafc h\u1eb3n nh\u1eefng c\u1ee5m t\u1eeb n\u00e0y \u0111\u00e3 r\u1ea5t quen v\u1edbi ch\u00fang ta. Nh\u01b0ng c\u00f3 th\u1ec3 ch\u00fang ta l\u1ea1i ch\u01b0a hi\u1ec3u r\u00f5 v\u1ec1 l\u1ef1c l\u00e0 g\u00ec? Hai […]<\/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":[4,7],"tags":[],"class_list":["post-1139","post","type-post","status-publish","format-standard","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1139","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=1139"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1139\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}