{"id":1197,"date":"2021-10-09T00:52:11","date_gmt":"2021-10-09T00:52:11","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=1197"},"modified":"2021-10-14T22:12:04","modified_gmt":"2021-10-14T15:12:04","slug":"duong-suc-tu-la-gi-tinh-chat-cua-duong-suc-tu-la-gi-kien-thuc-ly-9","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/duong-suc-tu-la-gi-tinh-chat-cua-duong-suc-tu-la-gi-kien-thuc-ly-9\/","title":{"rendered":"\u0110\u01b0\u1eddng s\u1ee9c t\u1eeb l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb l\u00e0 g\u00ec? Ki\u1ebfn th\u1ee9c l\u00fd 9"},"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\">H\u1ecdc ph\u1ea7n l\u00fd 9 lu\u00f4n l\u00e0m cho c\u00e1c em th\u1ea5y hoang mang b\u1edfi \u0111\u1ed9 ph\u1ee7 r\u1ed9ng c\u1ee7a nhi\u1ec1u ki\u1ebfn th\u1ee9c. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 c\u00f3 th\u1ec3 n\u1eafm r\u00f5 h\u1ebft th\u00f4ng tin v\u00e0 kh\u00e1i ni\u1ec7m li\u00ean quan lu\u00f4n l\u00e0 \u0111i\u1ec1u c\u00e1c em quan t\u00e2m. B\u1edfi th\u1ebf, ch\u00fang t\u00f4i mu\u1ed1n mang \u0111\u1ebfn m\u1ed9t b\u00e0i vi\u1ebft chia s\u1ebb b\u1ed5 \u00edch v\u1ec1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. \u0110\u00e2y l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb l\u00e0 g\u00ec b\u1ea1n c\u00f3 bi\u1ebft? N\u1ebfu mu\u1ed1n t\u00ecm hi\u1ec3u, c\u00f9ng \u0111\u1ecdc ngay b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y c\u1ee7a ch\u00fang t\u00f4i nh\u00e9. Ch\u1eafc ch\u1eafn nh\u1eefng th\u00f4ng tin li\u00ean quan m\u00e0 ch\u00fang t\u00f4i mang \u0111\u1ebfn s\u1ebd l\u00e0m cho c\u00e1c b\u1ea1n th\u1ea5y h\u00e0i l\u00f2ng. C\u00f9ng b\u1eaft \u0111\u1ea7u t\u00ecm hi\u1ec3u ngay th\u00f4i!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u01b0\u1eddng s\u1ee9c qua nam ch\u00e2m ch\u1eef U<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh ngh\u0129a v\u1ec1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh ngh\u0129a v\u1ec1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch kh\u00f4ng c\u00f3 g\u00ec qu\u00e1 kh\u00f3 hi\u1ec3u. \u0110\u00e2y l\u00e0 nh\u1eefng \u0111\u01b0\u1eddng \u0111\u01b0\u1ee3c v\u1ebd \u1edf trong kh\u00f4ng gian c\u00f3 t\u1eeb tr\u01b0\u1eddng. Ch\u00fang \u0111\u00e1p \u1ee9ng \u0111i\u1ec1u ki\u1ec7n ti\u1ebfp tuy\u1ebfn t\u1ea1i m\u1ed7i \u0111i\u1ec3m s\u1ebd c\u00f3 h\u01b0\u1edbng tr\u00f9ng v\u1edbi h\u01b0\u1edbng c\u1ee7a t\u1eeb tr\u01b0\u1eddng n\u1eb1m t\u1ea1i \u0111i\u1ec3m \u0111\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quy t\u1eafc n\u1eafm tay x\u00e1c \u0111\u1ecbnh chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t trong nh\u1eefng quy t\u1eafc \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb ch\u00ednh l\u00e0 quy t\u1eafc n\u1eafm b\u00e0n tay ph\u1ea3i. Th\u1ef1c hi\u1ec7n thao t\u00e1c n\u00e0y kh\u00f4ng c\u00f3 g\u00ec qu\u00e1 kh\u00f3 kh\u0103n. Khi th\u1ef1c hi\u1ec7n, c\u00e1c em h\u00e3y \u0111\u1ec3 b\u00e0n tay ph\u1ea3i sao cho ng\u00f3n tay c\u00e1i n\u1eb1m d\u1ecdc theo d\u00e2y d\u1eabn, ch\u1ec9 v\u00e0o chi\u1ec1u c\u1ee7a d\u00f2ng \u0111i\u1ec7n. L\u00fac n\u00e0y, c\u00e1c ng\u00f3n tay khum l\u1ea1i ch\u00ednh l\u00e0 chi\u1ec1u \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb ph\u1ed5 l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00ean c\u1ea1nh \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00ec t\u1eeb ph\u1ed5 c\u0169ng l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi quan t\u00e2m. T\u1eeb ph\u1ed5 ch\u00ednh l\u00e0 m\u1ed9t h\u00ecnh \u1ea3nh tr\u1ef1c quan m\u00f4 t\u1ea3 t\u1eeb tr\u01b0\u1eddng. Ta c\u00f3 th\u1ec3 thu \u0111\u01b0\u1ee3c t\u1eeb ph\u1ed5 b\u1eb1ng nhi\u1ec1u c\u00e1ch kh\u00e1c nhau. V\u00ed d\u1ee5, r\u1eafc m\u1ea1t s\u1eaft l\u00ean t\u1ea5m b\u00eca \u0111\u01b0\u1ee3c \u0111\u1eb7t trong t\u1eeb tr\u01b0\u1eddng r\u1ed3i g\u00f5 nh\u1eb9. L\u00fac n\u00e0y, c\u00e1c m\u1ea1t s\u1eaft s\u1ebd t\u1ef1 s\u1eafp x\u1ebfp \u1edf b\u00ean tr\u00ean c\u1ee7a t\u1ea5m b\u00eca.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, b\u00ean trong t\u1eeb tr\u01b0\u1eddng c\u1ee7a c\u00e1c thanh nam ch\u00e2m, c\u00e1c m\u1ea1t s\u1eaft s\u1ebd t\u1ef1 x\u1ebfp th\u00e0nh nh\u1eefng \u0111\u01b0\u1eddng cong. Ch\u00fang n\u1ed1i t\u1eeb c\u1ef1c n\u00e0y sang \u0111\u1ebfn c\u1ef1c kia c\u1ee7a nam ch\u00e2m. Khi \u0111i c\u00e0ng xa nam ch\u00e2m, nh\u1eefng \u0111\u01b0\u1eddng s\u1ee9c n\u00e0y s\u1ebd c\u00e0ng th\u01b0a d\u1ea7n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb \u0111\u00f3 r\u00fat ra \u0111\u01b0\u1ee3c k\u1ebft lu\u1eadn: N\u01a1i n\u00e0o c\u00f3 m\u1ea1t s\u1eaft d\u00e0y th\u00ec s\u1ebd th\u1ea5y c\u00f3 t\u1eeb tr\u01b0\u1eddng m\u1ea1nh. C\u00f2n n\u01a1i n\u00e0o c\u00f3 m\u1ea1t s\u1eaft th\u01b0a th\u00ec s\u1ebd th\u1ea5y c\u00f3 t\u1eeb tr\u01b0\u1eddng y\u1ebfu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u1ec1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu \u0111i qua nam ch\u00e2m h\u00ecnh ch\u1eef U<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00ean ngo\u00e0i c\u1ee7a nam ch\u00e2m, nh\u1eefng \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb s\u1ebd l\u00e0 nh\u1eefng \u0111\u01b0\u1eddng cong. Ch\u00fang c\u00f3 h\u00ecnh d\u1ea1ng \u0111\u1ed1i x\u1ee9ng \u0111i qua tr\u1ee5c c\u1ee7a thanh nam ch\u00e2m ch\u1eef U. Ngo\u00e0i ra, chi\u1ec1u c\u1ea3 ch\u00fang s\u1ebd l\u00e0 \u0111i v\u00e0o c\u1ef1c Nam v\u00e0 \u0111i ra t\u1eeb c\u1ef1c B\u1eafc.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi \u0111\u1ebfn c\u00e0ng g\u1ea7n \u0111\u1ea7u c\u1ee7a thanh nam ch\u00e2m, \u0111\u01b0\u1eddng s\u1ee9c s\u1ebd c\u00e0ng mau h\u01a1n. \u0110i\u1ec1u n\u00e0y \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c t\u1eeb tr\u01b0\u1eddng s\u1ebd c\u00e0ng m\u1ea1nh h\u01a1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, \u0111\u01b0\u1eddng s\u1ee9c c\u1ee7a t\u1eeb tr\u01b0\u1eddng \u1edf trong kho\u1ea3ng kh\u00f4ng gian gi\u1eefa hai c\u1ef1c nam ch\u00e2m s\u1ebd l\u00e0 nh\u1eefng \u0111\u01b0\u1eddng th\u1eb3ng. Ch\u00fang song song v\u00e0 c\u00e1ch \u0111\u1ec1u nhau. Ng\u01b0\u1eddi ta g\u1ecdi t\u1eeb tr\u01b0\u1eddng trong khu v\u1ef1c \u0111\u00f3 l\u00e0 t\u1eeb tr\u01b0\u1eddng \u0111\u1ec1u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu \u0111i qua nam ch\u00e2m th\u1eb3ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi tr\u01b0\u1eddng h\u1ee3p \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb \u0111i qua nam ch\u00e2m th\u1eb3ng. \u1ede b\u00ean ngo\u00e0i nam ch\u00e2m, ch\u00fang s\u1ebd c\u00f3 h\u00ecnh d\u1ea1ng nh\u1eefng \u0111\u01b0\u1eddng cong. \u0110\u00e2y l\u00e0 h\u00ecnh d\u1ea1ng \u0111\u1ed1i x\u1ee9ng qua c\u00e1c tr\u1ee5c c\u1ee7a thanh nam ch\u00e2m. Ngo\u00e0i ra, ch\u00fang c\u00f3 chi\u1ec1u \u0111i t\u1eeb c\u1ef1c B\u1eafc v\u00e0 \u0111i v\u00e0o t\u1eeb c\u1ef1c Nam.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c \u0111\u01b0\u1eddng s\u1ee9c s\u1ebd c\u00e0ng mau h\u01a1n n\u1ebfu c\u00e0ng g\u1ea7n \u0111\u1ebfn v\u1edbi nh\u1eefng thanh nam ch\u00e2m. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 t\u1eeb tr\u01b0\u1eddng s\u1ebd c\u00e0ng m\u1ea1nh h\u01a1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ednh ch\u1ea5t c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u1eafc \u0111\u1ebfn t\u00ednh ch\u1ea5t c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb, ch\u00fang c\u00f3 3 t\u00ednh ch\u1ea5t nh\u01b0 sau. \u0110\u1ea7u ti\u00ean, qua m\u1ed7i \u0111i\u1ec3m \u1edf trong kh\u00f4ng gian ch\u1ec9 c\u00f3 th\u1ec3 v\u1ebd \u0111\u01b0\u1ee3c m\u1ed9t \u0111\u01b0\u1eddng s\u1ee9c. Th\u1ee9 hai, c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c l\u00e0 nh\u1eefng \u0111\u01b0\u1eddng cong. Ch\u00fang kh\u00e9p k\u00edn ho\u1eb7c l\u00e0 v\u00f4 h\u1ea1n \u1edf c\u1ea3 hai \u0111\u1ea7u. Ngo\u00e0i ra, chi\u1ec1u c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb s\u1ebd tu\u00e2n theo quy t\u1eafc x\u00e1c \u0111\u1ecbnh nh\u01b0 tr\u00ean.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00e1i \u0111\u1ea5t l\u00e0 m\u1ed9t nam ch\u00e2m c\u1ef1c l\u1edbn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Li\u00ean h\u1ec7 v\u1edbi th\u1ef1c t\u1ebf<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00e1i \u0111\u1ea5t \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t nam ch\u00e2m kh\u1ed5ng l\u1ed3, ch\u00fang c\u00f3 t\u1eeb tr\u01b0\u1eddng r\u1ea5t m\u1ea1nh. L\u00fd do l\u00e0 b\u1edfi s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng m\u1ea1nh c\u1ee7a c\u00e1c ch\u1ea5t d\u1eabn \u0111i\u1ec7n l\u1ecfng n\u1eb1m \u1edf b\u00ean trong l\u00f2ng \u0111\u1ea5t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u1edd c\u00f3 l\u1edbp t\u1eeb tr\u01b0\u1eddng n\u00e0y, tr\u00e1i \u0111\u1ea5t t\u1ea1o n\u00ean m\u1ed9t l\u1edbp r\u00e0o ch\u1eafn. \u0110\u00e2y l\u00e0 th\u1ee9 c\u00f3 t\u00e1c d\u1ee5ng b\u1ea3o v\u1ec7 v\u00e0 ch\u1ed1ng l\u1ea1i \u0111\u01b0\u1ee3c b\u00e3o t\u1eeb M\u1eb7t tr\u1eddi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1edbp t\u1eeb tr\u01b0\u1eddng n\u00e0y r\u1ea5t c\u00f3 \u00edch \u0111\u1ed1i v\u1edbi tr\u00e1i \u0111\u1ea5t. Ch\u00fang gi\u00fap tr\u00e1i \u0111\u1ea5t kh\u00f4ng ph\u1ea3i h\u1ee9ng ch\u1ecbu c\u00e1c h\u1ea1t mang \u0111i\u1ec7n c\u00f3 h\u1ea1i t\u1eeb m\u1eb7t tr\u1eddi. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ea3o v\u1ec7 s\u1ef1 s\u1ed1ng c\u1ee7a tr\u00e1i \u0111\u1ea5t b\u1edfi n\u1ebfu b\u1ecb nhi\u1ec5m c\u00e1c h\u1ea1t n\u00e0y, s\u1ef1 s\u1ed1ng kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u01b0\u1ee3c n\u1eefa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp v\u00e0 l\u1eddi gi\u1ea3i th\u00f4ng tin li\u00ean quan<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u00e0 l\u1eddi gi\u1ea3i c\u00f3 li\u00ean quan \u0111\u1ebfn \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. B\u1ea1n h\u00e3y tham kh\u1ea3o \u0111\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c c\u00e1ch l\u00e0m nhanh nh\u1ea5t nh\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i t\u1eadp<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 2 trang 124 s\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 11<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u00e1t bi\u1ec3u l\u1ea1i \u0111\u1ecbnh ngh\u0129a c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 3 trang 124 s\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 11<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So s\u00e1nh nh\u1eefng t\u00ednh ch\u1ea5t c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c \u0111i\u1ec7n v\u00e0 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 8 trang 124 s\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 11<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f3 hai kim nam ch\u00e2m nh\u1ecf \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf xa d\u00f2ng \u0111i\u1ec7n v\u00e0 c\u00e1c nam ch\u00e2m kh\u00e1c. C\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa hai tr\u1ecdng t\u00e2m c\u1ee7a ch\u00fang th\u01b0\u1eddng n\u1eb1m theo h\u01b0\u1edbng Nam B\u1eafc. Khi ch\u00fang c\u00e2n b\u1eb1ng, h\u01b0\u1edbng c\u1ee7a hai kim nam ch\u00e2m n\u00e0y s\u1ebd nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chi\u1ec1u \u0111\u01b0\u1eddng s\u1ee9c nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e1p \u00e1n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 2 trang 124 s\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 11<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f3 th\u1ec3 th\u1ea5y, \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb l\u00e0 nh\u1eefng \u0111\u01b0\u1eddng cong \u0111\u01b0\u1ee3c v\u1ebd b\u00ean trong kh\u00f4ng gian c\u00f3 t\u1eeb tr\u01b0\u1eddng. Ch\u00fang c\u00f3 ti\u1ebfp tuy\u1ebfn t\u1ea1i m\u1ed7i \u0111i\u1ec3m c\u00f3 h\u01b0\u1edbng tr\u00f9ng v\u1edbi h\u01b0\u1edbng c\u1ee7a t\u1eeb tr\u01b0\u1eddng \u1edf t\u1ea1i \u0111i\u1ec3m \u0111\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 3 trang 124 s\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 11<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So s\u00e1nh c\u1ea7n ph\u1ea3i ch\u1ec9 ra \u0111\u01b0\u1ee3c \u0111i\u1ec3m gi\u1ed1ng nhau v\u00e0 \u0111i\u1ec3m kh\u00e1c nhau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec3m gi\u1ed1ng nhau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Qua m\u1ed7i \u0111i\u1ec3m \u1edf b\u00ean trong kh\u00f4ng gian n\u01a1i m\u00e0 c\u00f3 \u0111i\u1ec7n tr\u01b0\u1eddng, ta ch\u1ec9 c\u00f3 th\u1ec3 v\u1ebd \u0111\u01b0\u1ee3c m\u1ed9t \u0111\u01b0\u1eddng s\u1ee9c \u0111i\u1ec7n. Ngo\u00e0i ra, c\u0169ng qua m\u1ed7i \u0111i\u1ec3m \u1edf trong kh\u00f4ng gian c\u00f3 t\u1eeb tr\u01b0\u1eddng, ta v\u1ebd \u0111\u01b0\u1ee3c m\u1ed9t \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quy \u01b0\u1edbc c\u1ee7a hai \u0111\u01b0\u1eddng s\u1ee9c \u0111\u1ec1u gi\u1ed1ng nhau. N\u01a1i n\u00e0o c\u00f3 t\u1eeb tr\u01b0\u1eddng m\u1ea1nh ho\u1eb7c \u0111i\u1ec7n tr\u01b0\u1eddng m\u1ea1nh th\u00ec \u0111\u01b0\u1eddng s\u1ee9c s\u1ebd d\u00e0y h\u01a1n. C\u00f2n n\u01a1i n\u00e0o c\u00f3 t\u1eeb tr\u01b0\u1eddng y\u1ebfu ho\u1eb7c \u0111i\u1ec7n tr\u01b0\u1eddng y\u1ebfu th\u00ec \u0111\u01b0\u1eddng s\u1ee9c s\u1ebd th\u01b0a h\u01a1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec3m kh\u00e1c nhau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u01b0\u1eddng s\u1ee9c \u0111i\u1ec7n th\u00f4ng th\u01b0\u1eddng kh\u00f4ng kh\u00e9p k\u00edn. Ch\u00fang b\u1eaft \u0111\u1ea7u xu\u1ea5t ph\u00e1t t\u1eeb \u0111i\u1ec7n t\u00edch d\u01b0\u01a1ng v\u00e0 s\u1ebd k\u1ebft th\u00fac \u1edf \u0111i\u1ec7n t\u00edch \u00e2m. Ngo\u00e0i ra, tr\u01b0\u1eddng h\u1ee3p ch\u1ec9 c\u00f3 \u0111i\u1ec7n t\u00edch d\u01b0\u01a1ng ho\u1eb7c \u0111i\u1ec7n t\u00edch \u00e2m, ch\u00fang s\u1ebd b\u1eaft \u0111\u1ea7u ho\u1eb7c k\u1ebft th\u00fac \u1edf v\u00f4 c\u1ef1c. Chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c \u0111i\u1ec7n s\u1ebd h\u01b0\u1edbng v\u00e0o v\u1eadt nhi\u1ec5m \u0111i\u1ec7n \u00e2m. Ch\u00fang h\u01b0\u1edbng ra t\u1eeb v\u1eadt nhi\u1ec5m \u0111i\u1ec7n d\u01b0\u01a1ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u01b0\u1eddng s\u1ee9c t\u1eeb th\u00f4ng th\u01b0\u1eddng l\u00e0 nh\u1eefng \u0111\u01b0\u1eddng cong kh\u00e9p k\u00edn ho\u1eb7c ch\u00fang v\u00f4 h\u1ea1n \u1edf hai \u0111\u1ea7u. Ngo\u00e0i ra, chi\u1ec1u c\u1ee7a \u0111\u01b0\u1eddng s\u1ee9c n\u00e0y tu\u00e2n theo quy t\u1eafc n\u1eafm b\u00e0n tay ph\u1ea3i ho\u1eb7c c\u00f2n g\u1ecdi l\u00e0 quy t\u1eafc ra B\u1eafc v\u00e0o Nam.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i 8 trang 124 s\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 11<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu nh\u01b0 t\u1eeb tr\u01b0\u1eddng c\u1ee7a tr\u00e1i \u0111\u1ea5t m\u1ea1nh h\u01a1n t\u1eeb tr\u01b0\u1eddng c\u1ee7a kim nam ch\u00e2m, ta th\u1ea5y kim nam ch\u00e2m s\u1ebd ch\u1ecbu t\u00e1c d\u1ee5ng c\u1ee7a t\u1eeb tr\u01b0\u1eddng tr\u00e1i \u0111\u1ea5t. Do \u0111\u00f3, c\u00e1c kim nam ch\u00e2m s\u1ebd \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp l\u1ea7n l\u01b0\u1ee3t theo h\u01b0\u1edbng t\u1eeb Nam \u0111\u1ebfn B\u1eafc.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, n\u1ebfu nh\u01b0 t\u1eeb tr\u01b0\u1eddng c\u1ee7a tr\u00e1i \u0111\u1ea5t y\u1ebfu h\u01a1n t\u1eeb tr\u01b0\u1eddng c\u1ee7a kim nam ch\u00e2m th\u00ec hai kim nam ch\u00e2m s\u1ebd x\u1ebfp ch\u1ed3ng l\u00ean nhau. Khi \u0111\u00f3, c\u1ef1c b\u1eafc c\u1ee7a nam ch\u00e2m n\u00e0y s\u1ebd h\u00fat c\u1ef1c nam c\u1ee7a nam ch\u00e2m kia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Th\u00f4ng tin \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb qua nam ch\u00e2m<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin m\u00e0 ch\u00fang t\u00f4i mang \u0111\u1ebfn cho b\u1ea1n \u0111\u1ecdc v\u1ec1 \u0111\u01b0\u1eddng s\u1ee9c t\u1eeb. \u0110\u00e2y \u0111\u1ec1u l\u00e0 nh\u1eefng th\u00f4ng tin c\u1ea7n thi\u1ebft v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi nh\u1eefng k\u1ef3 thi c\u00f3 m\u00f4n V\u1eadt L\u00fd. Do \u0111\u00f3 d\u00f9 b\u1ea1n h\u1ecdc theo ch\u01b0\u01a1ng tr\u00ecnh c\u01a1 b\u1ea3n hay ch\u01b0\u01a1ng tr\u00ecnh n\u00e2ng cao, b\u1ea1n c\u0169ng n\u00ean bi\u1ebft nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y nh\u00e9. \u0110\u1eebng qu\u00ean gi\u00fap ch\u00fang t\u00f4i chia s\u1ebb b\u00e0i vi\u1ebft t\u1edbi nh\u1eefng ng\u01b0\u1eddi xung quanh \u0111\u1ec3 th\u00eam nhi\u1ec1u ng\u01b0\u1eddi bi\u1ebft nh\u1eefng th\u00f4ng tin n\u00e0y nh\u00e9. Ngo\u00e0i ra, ch\u00fang t\u00f4i khuy\u1ebfn kh\u00edch b\u1ea1n \u0111\u1ecdc th\u00eam b\u00e0i vi\u1ebft v\u1ec1 \u1ee9ng d\u1ee5ng c\u1ee7a nam ch\u00e2m. R\u1ea5t nhi\u1ec1u<\/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 ph\u1ea7n l\u00fd 9 lu\u00f4n l\u00e0m cho c\u00e1c em th\u1ea5y hoang mang b\u1edfi \u0111\u1ed9 ph\u1ee7 r\u1ed9ng c\u1ee7a nhi\u1ec1u ki\u1ebfn th\u1ee9c. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 c\u00f3 th\u1ec3 n\u1eafm r\u00f5 h\u1ebft th\u00f4ng tin v\u00e0 kh\u00e1i ni\u1ec7m li\u00ean quan lu\u00f4n l\u00e0 \u0111i\u1ec1u c\u00e1c em quan t\u00e2m. B\u1edfi th\u1ebf, ch\u00fang t\u00f4i mu\u1ed1n mang [&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":[4,7],"tags":[],"class_list":["post-1197","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\/1197","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=1197"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1197\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}