Tr\u00ean b\u1ea3n \u0111\u1ed3, Trung Qu\u1ed1c c\u00f3 \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n kh\u00e1 d\u00e0i, c\u00f2n trong s\u00e1ch gi\u00e1o khoa \u0111\u1ecba l\u00ed l\u1ea1i th\u01b0\u1eddng vi\u1ebft \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n Trung Qu\u1ed1c d\u00e0i c\u1ee5 th\u1ec3 bao nhi\u00eau.<\/p>\n\n\n\n
\u0110\u1ed9 d\u00e0i \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n \u0111\u01b0\u1ee3c \u0111o nh\u01b0 th\u1ebf n\u00e0o nh\u1ec9? M\u1ed9t ph\u01b0\u01a1ng ph\u00e1p nguy\u00ean thu\u1ef7 nh\u1ea5t l\u00e0 x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc m\u1ed9t kho\u1ea3ng \u0111o \u0111\u1ed9 d\u00e0i, v\u00ed d\u1ee5 l\u00e0 d, r\u1ed3i t\u1eeb m\u1ed9t \u0111\u1ea7u c\u1ee7a \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n tu\u1ea7n t\u1ef1 \u0111o cho \u0111\u1ebfn \u0111\u1ea7u kia. N\u1ebfu s\u1ed1 l\u1ea7n \u0111o l\u00e0 N, th\u1ebf th\u00ec v\u1ec1 tr\u1ef1c quan cho r\u1eb1ng, \u0111\u1ed9 d\u00e0i c\u1ee7a c\u1ea3 \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n ph\u1ea3i l\u00e0 Nd. Hi\u1ec3n nhi\u00ean, do h\u00ecnh d\u1ea1ng c\u1ee7a \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n h\u1ebft s\u1ee9c v\u00f4 quy t\u1eafc, c\u00f3 b\u00e3i c\u00e1t b\u1eb1ng ph\u1eb3ng, c\u0169ng c\u00f3 khe n\u00fai d\u1ef1ng \u0111\u1ee9ng; c\u00f3 c\u1eeda s\u00f4ng cu\u1ed3n cu\u1ed9n, c\u0169ng c\u00f3 v\u1ecbnh bi\u1ec3n tr\u01b0\u1eddn d\u00e0i li\u00ean mi\u00ean. Trong qu\u00e3ng c\u00e1ch th\u1eb3ng c\u1ee7a m\u1ed9t kho\u1ea3ng \u0111o d, ch\u1eafc ch\u1eafn c\u00f3 nhi\u1ec1u \u0111\u1ed9 d\u00e0i chi ti\u1ebft cong cong g\u1eadp g\u1eadp b\u1ecb b\u1ecf qua. Do \u0111\u00f3 c\u00f3 th\u1ec3 suy ngh\u0129 m\u1ed9t c\u00e1ch h\u1ee3p l\u00ed r\u1eb1ng, \u0111\u1ed9 d\u00e0i kho\u1ea3ng \u0111o d c\u00e0ng nh\u1ecf, k\u1ebft qu\u1ea3 \u0111o \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n ph\u1ea3i c\u00e0ng ch\u00ednh x\u00e1c. N\u1ebfu d c\u00e0ng nh\u1ecf, s\u1ed1 l\u1ea7n \u0111o N c\u00e0ng l\u1edbn, b\u1ed9 ph\u1eadn v\u00f4 quy t\u1eafc \u0111o \u0111\u01b0\u1ee3c c\u00e0ng nhi\u1ec1u, v\u00ec v\u1eady \u0111\u1ed9 d\u00e0i t\u1ed5ng \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n \u0111o b\u1eb1ng th\u01b0\u1edbc \u0111o ng\u1eafn s\u1ebd d\u00e0i h\u01a1n k\u1ebft qu\u1ea3 \u0111o b\u1eb1ng th\u01b0\u1edbc \u0111o d\u00e0i. Th\u1ebf th\u00ec, m\u1ed9t khi ch\u1ecdn d r\u1ea5t nh\u1ecf, th\u1eadm ch\u00ed g\u1ea7n b\u1eb1ng kh\u00f4ng, c\u00f3 ph\u1ea3i \u0111\u1ed9 d\u00e0i t\u1ed5ng Nd l\u00e0 \u0111\u1ed9 d\u00e0i th\u1ef1c t\u1ebf c\u1ee7a \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n hay ch\u01b0a? K\u1ebft qu\u1ea3 \u0111o \u0111\u1ea1c c\u1ee7a c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n c\u1ee7a nhi\u1ec1u qu\u1ed1c gia tr\u00ean th\u1ebf gi\u1edbi cho th\u1ea5y, khi ng\u01b0\u1eddi ta d\u00f9ng d r\u1ea5t nh\u1ecf nh\u1eb1m \u0111o m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n, \u0111\u1ed9 d\u00e0i Nd \u0111\u00f3 kh\u00f4ng \u0111\u1ebfn g\u1ea7n \u0111\u1ed9 d\u00e0i th\u1ef1c t\u1ebf, m\u00e0 l\u00e0 theo \u0111\u00e0 d ng\u00e0y c\u00e0ng nh\u1ecf, \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n \u0111o \u0111\u01b0\u1ee3c ng\u00e0y c\u00e0ng l\u1edbn. \u0110i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n kh\u00f4ng th\u1ec3 \u0111o m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n
Nguy\u00ean nh\u00e2n xu\u1ea5t hi\u1ec7n t\u00ecnh h\u00ecnh k\u1ec3 tr\u00ean \u1edf ch\u1ed7, \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh b\u1edfi c\u00e1c l\u1ef1c thi\u00ean nhi\u00ean (bi\u1ebfn thi\u00ean c\u1ee7a v\u1ecf Tr\u00e1i \u0110\u1ea5t, x\u00f3i m\u00f2n c\u1ee7a m\u01b0a gi\u00f3 v.v.). N\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u01b0\u1eddng cong theo \u00fd ngh\u0129a h\u00ecnh h\u1ecdc th\u00f4ng th\u01b0\u1eddng – \u0111\u01b0\u1eddng cong h\u00ecnh h\u1ecdc Eucle. \u0110\u1eb7c tr\u01b0ng ch\u1ee7 y\u1ebfu c\u1ee7a \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n l\u00e0 c\u00f3 t\u00ednh g\u1ea7n gi\u1ed1ng nhau c\u1ee5c b\u1ed9 v\u00e0 t\u1ed5ng th\u1ec3, c\u0169ng c\u00f3 ngh\u0129a l\u00e0 n\u1ebfu l\u1ea5y m\u1ed9t \u0111o\u1ea1n tu\u1ef3 \u00fd c\u1ee7a \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n r\u1ed3i ph\u00f3ng \u0111\u1ea1i l\u00ean g\u1ea5p nhi\u1ec1u l\u1ea7n, ch\u00fang ta s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c “\u0111\u01b0\u1eddng b\u1edd bi\u1ec3n” v\u1ec1 \u0111\u1ea1i th\u1ec3 t\u01b0\u01a1ng t\u1ef1 v\u1edbi h\u00ecnh d\u1ea1ng \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n ch\u00e2n th\u1ef1c t\u1ed5ng th\u1ec3. \u0110\u1ec3 ph\u00e2n bi\u1ec7t v\u1edbi h\u00ecnh d\u1ea1ng h\u00ecnh h\u1ecdc th\u00f4ng th\u01b0\u1eddng, hi\u1ec7n nay ng\u01b0\u1eddi ta g\u1ecdi h\u00ecnh d\u1ea1ng c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m v\u1ec1 t\u00ednh t\u1ef1 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 ki\u1ec3u \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n l\u00e0 ph\u00e2n h\u00ecnh (fractan). Quan s\u00e1t t\u1ec9 m\u1ec9 gi\u1edbi t\u1ef1 nhi\u00ean xung quanh, ch\u00fang ta c\u00f2n c\u00f3 th\u1ec3 t\u00ecm th\u1ea5y r\u1ea5t nhi\u1ec1u v\u00ed d\u1ee5 v\u1ec1 ph\u00e2n h\u00ecnh, v\u00ed d\u1ee5 nh\u01b0 h\u00ecnh d\u1ea1ng c\u1ee7a \u00e1nh ch\u1edbp tr\u00ean b\u1ea7u tr\u1eddi \u0111\u00eam, c\u1ee7a t\u1eebng \u0111\u00e1m m\u00e2y tr\u1eafng l\u01a1 l\u1eedng tr\u00ean tr\u1eddi, th\u1eadm ch\u00ed c\u1ee7a ph\u1ed5i v\u00e0 h\u1ec7 th\u1ed1ng nh\u00e1nh kh\u00ed qu\u1ea3n b\u00ean trong c\u01a1 th\u1ec3 ng\u01b0\u1eddi v.v. \u0111\u1ec1u l\u00e0 ph\u00e2n h\u00ecnh. C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 ti\u1ebfn h\u00e0nh nghi\u00ean c\u1ee9u ch\u00fang v\u1ec1 m\u1eb7t h\u00ecnh h\u1ecdc ph\u00e2n h\u00ecnh, v\u00e0 \u0111\u00e3 thu \u0111\u01b0\u1ee3c nhi\u1ec1u nh\u1eadn th\u1ee9c m\u1edbi \u0111\u1ed1i v\u1edbi gi\u1edbi t\u1ef1 nhi\u00ean.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: \u0110\u01b0\u1eddng b\u1edd bi\u1ec3n; H\u00ecnh h\u1ecdc Eucle; Ph\u00e2n h\u00ecnh.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Tr\u00ean b\u1ea3n \u0111\u1ed3, Trung Qu\u1ed1c c\u00f3 \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n kh\u00e1 d\u00e0i, c\u00f2n trong s\u00e1ch gi\u00e1o khoa \u0111\u1ecba l\u00ed l\u1ea1i th\u01b0\u1eddng vi\u1ebft \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n Trung Qu\u1ed1c d\u00e0i c\u1ee5 th\u1ec3 bao nhi\u00eau. \u0110\u1ed9 d\u00e0i \u0111\u01b0\u1eddng b\u1edd bi\u1ec3n \u0111\u01b0\u1ee3c \u0111o nh\u01b0 th\u1ebf n\u00e0o nh\u1ec9? M\u1ed9t ph\u01b0\u01a1ng ph\u00e1p nguy\u00ean thu\u1ef7 nh\u1ea5t l\u00e0 x\u00e1c \u0111\u1ecbnh tr\u01b0\u1edbc m\u1ed9t kho\u1ea3ng \u0111o […]<\/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":[15,7],"tags":[],"class_list":["post-5850","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5850","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=5850"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5850\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5850"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5850"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}