C\u00e1c t\u00e0u thu\u1ef7 l\u1edbn hi\u1ec7n \u0111\u1ea1i \u0111\u1ec1u l\u00e0m b\u1eb1ng th\u00e9p, th\u00e9p n\u1eb7ng h\u01a1n n\u01b0\u1edbc s\u00e1u l\u1ea7n, ph\u1ea7n l\u1edbn c\u00e1c h\u00e0ng ho\u00e1 ch\u1edf \u1edf trong t\u00e0u nh\u01b0 l\u01b0\u01a1ng th\u1ef1c, m\u00e1y m\u00f3c, v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng v.v. c\u0169ng \u0111\u1ec1u n\u1eb7ng h\u01a1n n\u01b0\u1edbc r\u1ea5t nhi\u1ec1u, th\u1ebf m\u00e0 t\u1ea1i sao c\u00e1c t\u00e0u ch\u1edf n\u1eb7ng nh\u01b0 v\u1eady l\u1ea1i c\u00f3 th\u1ec3 n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc?<\/p>\n\n\n\n
\u0110\u1ec3 hi\u1ec3u v\u1ea5n \u0111\u1ec1 n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 l\u00e0m m\u1ed9t th\u00ed nghi\u1ec7m sau \u0111\u00e2y: \u0110\u1eb7t m\u1ed9t t\u1ea5m t\u00f4n m\u1ecfng xu\u1ed1ng n\u01b0\u1edbc, n\u00f3 s\u1ebd b\u1ecb ch\u00ecm ngay; n\u1ebfu l\u00e0m t\u1ea5m t\u00f4n \u1ea5y th\u00e0nh h\u00ecnh h\u1ed9p, tr\u1ecdng l\u01b0\u1ee3ng kh\u00f4ng thay \u0111\u1ed5i, n\u00f3 l\u1ea1i c\u00f3 th\u1ec3 n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc; kh\u00f4ng nh\u1eefng th\u1ebf, n\u1ebfu cho m\u1ed9t s\u1ed1 \u0111\u1ed3 v\u1eadt v\u00e0o h\u1ed9p, h\u1ed9p c\u0169ng ch\u1ec9 h\u01a1i ch\u00ecm xu\u1ed1ng nh\u01b0ng v\u1eabn c\u00f3 th\u1ec3 n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc. \u0110\u00f3 l\u00e0 v\u00ec \u1edf \u0111\u00e1y h\u1ed9p ch\u1ecbu m\u1ed9t s\u1ee9c \u0111\u1ea9y c\u1ee7a n\u01b0\u1edbc h\u01b0\u1edbng th\u1eb3ng \u0111\u1ee9ng l\u00ean tr\u00ean. Ch\u1ec9 c\u1ea7n l\u1ef1c \u0111\u1ea9y l\u1edbn h\u01a1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a h\u1ed9p t\u00f4n, th\u00ec h\u1ed9p s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ea9y l\u00ean m\u00e0 kh\u00f4ng th\u1ec3 ch\u00ecm xu\u1ed1ng \u0111\u01b0\u1ee3c. \u0110\u01b0\u01a1ng nhi\u00ean xung quanh h\u1ed9p \u0111\u1ed3ng th\u1eddi c\u0169ng ch\u1ecbu \u00e1p l\u1ef1c c\u1ee7a n\u01b0\u1edbc, ch\u1eb3ng qua l\u00e0 \u0111\u1ed9 l\u1edbn c\u1ee7a \u00e1p l\u1ef1c n\u01b0\u1edbc \u1edf hai m\u1eb7t tr\u01b0\u1edbc v\u00e0 sau c\u1ee7a h\u1ed9p b\u1eb1ng nhau, nh\u01b0ng ng\u01b0\u1ee3c chi\u1ec1u nhau, n\u00ean \u0111\u00e3 b\u1ecb tri\u1ec7t ti\u00eau, \u00e1p l\u1ef1c \u1edf hai m\u1eb7t tr\u00e1i ph\u1ea3i c\u0169ng b\u1ecb tri\u1ec7t ti\u00eau nh\u01b0 v\u1eady. S\u1ee9c \u0111\u1ea9y t\u0103ng l\u00ean n\u1ebfu th\u1ec3 t\u00edch c\u1ee7a b\u1ed9 ph\u1eadn ng\u00e2m trong n\u01b0\u1edbc t\u0103ng l\u00ean. V\u00ec th\u1ec3 t\u00edch c\u1ee7a h\u1ed9p t\u00f4n l\u1edbn h\u01a1n t\u1ea5m t\u00f4n r\u1ea5t nhi\u1ec1u, tr\u1ecdng l\u01b0\u1ee3ng n\u01b0\u1edbc b\u1ecb gi\u00e3n ra c\u0169ng l\u1edbn h\u01a1n nhi\u1ec1u, cho n\u00ean ch\u1ecbu s\u1ee9c \u0111\u1ea9y c\u0169ng l\u1edbn h\u01a1n nhi\u1ec1u, do \u0111\u00f3, c\u00e1c th\u1ee9 \u0111\u1ef1ng trong h\u1ed9p v\u1eabn c\u00f3 th\u1ec3 n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc. T\u00e0u thu\u1ef7 l\u1edbn c\u00f3 th\u1ec3 n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc c\u0169ng theo l\u1ebd \u0111\u00f3.<\/p>\n\n\n\n
\u0110\u1ecbnh lu\u1eadt ch\u00ecm n\u1ed5i c\u1ee7a v\u1eadt th\u1ec3 l\u00e0 do Acsim\u00e9t, m\u1ed9t nh\u00e0 khoa h\u1ecdc c\u1ed5 Hy L\u1ea1p ph\u00e1t hi\u1ec7n c\u00e1ch \u0111\u00e2y 2000 n\u0103m; \u00f4ng ph\u00e1t bi\u1ec3u m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c r\u1eb1ng: “\u0110\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c \u0111\u1ea9y t\u00e1c d\u1ee5ng v\u00e0o v\u1eadt th\u1ec3 \u1edf trong n\u01b0\u1edbc b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng n\u01b0\u1edbc do v\u1eadt th\u1ec3 gi\u00e3n ra”. Ch\u00ecnh v\u00ec th\u1ebf n\u00ean t\u00e0u thu\u1ef7 n\u1eb7ng \u0111\u1ebfn h\u00e0ng v\u1ea1n t\u1ea5n, th\u1ec3 t\u00edch \u0111\u1ed3 s\u1ed9, nh\u01b0ng do \u0111\u1ed9 ng\u00e2m n\u01b0\u1edbc c\u00e0ng s\u00e2u, c\u00f3 ngh\u0129a l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng gi\u00e3n n\u01b0\u1edbc c\u1ee7a t\u00e0u c\u00e0ng l\u1edbn, n\u00f3 s\u1ebd ch\u1edf \u0111\u01b0\u1ee3c c\u00e0ng nhi\u1ec1u \u0111\u1ed3 \u0111\u1ea1c, h\u00e0ng ho\u00e1.<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: L\u1ef1c \u0111\u1ea9y; \u0110\u1ecbnh lu\u1eadt Archimedes; Tr\u1ecdng l\u01b0\u1ee3ng.<\/p>\n","protected":false},"excerpt":{"rendered":"
C\u00e1c t\u00e0u thu\u1ef7 l\u1edbn hi\u1ec7n \u0111\u1ea1i \u0111\u1ec1u l\u00e0m b\u1eb1ng th\u00e9p, th\u00e9p n\u1eb7ng h\u01a1n n\u01b0\u1edbc s\u00e1u l\u1ea7n, ph\u1ea7n l\u1edbn c\u00e1c h\u00e0ng ho\u00e1 ch\u1edf \u1edf trong t\u00e0u nh\u01b0 l\u01b0\u01a1ng th\u1ef1c, m\u00e1y m\u00f3c, v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng v.v. c\u0169ng \u0111\u1ec1u n\u1eb7ng h\u01a1n n\u01b0\u1edbc r\u1ea5t nhi\u1ec1u, th\u1ebf m\u00e0 t\u1ea1i sao c\u00e1c t\u00e0u ch\u1edf n\u1eb7ng nh\u01b0 v\u1eady l\u1ea1i c\u00f3 th\u1ec3 […]<\/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":[15,16],"tags":[],"class_list":["post-8917","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-ky-thuat"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8917","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=8917"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/8917\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=8917"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=8917"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=8917"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}