B\u1ea1n \u0111\u00e3 t\u1eebng nghe n\u00f3i \u0111\u1ebfn vi\u1ec7c d\u00f9ng th\u00ed nghi\u1ec7m \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n ch\u01b0a? L\u1ea5y m\u1ed9t t\u1edd gi\u1ea5y tr\u1eafng di\u1ec7n t\u00edch 1 m2. Trong t\u1edd gi\u1ea5y ta v\u1ebd v\u00f2ng tr\u00f2n \u0111\u01b0\u1eddng k\u00ednh 1 m (nh\u01b0 h\u00ecnh v\u1ebd). V\u00f2ng tr\u00f2n s\u1ebd ti\u1ebfp x\u00fac v\u1edbi h\u00ecnh vu\u00f4ng t\u1ea1i m\u1ed9t \u0111i\u1ec3m tr\u00ean m\u1ed7i c\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng. Di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n s\u1ebd l\u00e0 . Sau \u0111\u00f3 b\u1ea1n n\u00e9m t\u1eebng h\u1ea1t, t\u1eebng h\u1ea1t v\u1eebng v\u00e0o t\u1edd gi\u1ea5y m\u1ed9t c\u00e1ch tu\u1ef3 \u00fd.<\/p>\n\n\n\n
Khi b\u1ea1n n\u00e9m c\u00e1c h\u1ea1t v\u1eebng, b\u1ea1n c\u00f3 th\u1ec3 nh\u1edd m\u1ed9t b\u1ea1n kh\u00e1c ghi l\u1ea1i: T\u1ed5ng c\u00f3 bao nhi\u00eau l\u1ea7n n\u00e9m, c\u00f3 bao nhi\u00eau h\u1ea1t v\u1eebng r\u01a1i v\u00e0o v\u00f2ng tr\u00f2n?<\/p>\n\n\n\n
Sau khi th\u00ed nghi\u1ec7m k\u1ebft th\u00fac b\u1ea1n ch\u1ec9 c\u1ea7n l\u1ea5y s\u1ed1 h\u1ea1t v\u1eebng r\u01a1i v\u00e0o b\u00ean trong v\u00f2ng tr\u00f2n chia cho t\u1ed5ng s\u1ed1 h\u1ea1t v\u1eebng \u0111\u00e3 n\u00e9m.<\/p>\n\n\n\n
K\u1ebft qu\u1ea3 t\u00ednh \u0111\u01b0\u1ee3c ch\u00ednh l\u00e0 di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh tr\u00f2n. Ng\u01b0\u1eddi ta \u0111\u00e3 nh\u1eadn \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 nh\u01b0 sau trong 2000 l\u1ea7n n\u00e9m h\u1ea1t v\u1eebng c\u00f3 1572 h\u1ea1t r\u01a1i v\u00e0o b\u00ean trong v\u00f2ng tr\u00f2n v\u00e0 ta c\u00f3 di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n l\u00e0 1572\/2000 = 0,786m2. Con s\u1ed1 n\u00e0y r\u1ea5t g\u1ea7n v\u1edbi di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n l\u00e0 \u03c0\/4. T\u1eeb di\u1ec7n t\u00edch n\u00e0y s\u1ebd t\u00ednh \u0111\u01b0\u1ee3c s\u1ed1 \u03c0 = 4 x 0,768 = 3,144.<\/p>\n\n\n\n
N\u1ebfu s\u1ed1 h\u1ea1t v\u1eebng \u0111\u01b0\u1ee3c n\u00e9m \u0111i c\u00e0ng l\u1edbn th\u00ec k\u1ebft qu\u1ea3 t\u00ednh s\u1ebd c\u00e0ng ch\u00ednh x\u00e1c.<\/p>\n\n\n\n
Th\u00ed nghi\u1ec7m k\u00ec l\u1ea1 n\u00e0y kh\u00f4ng ph\u1ea3i \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh m\u1ed9t c\u00e1ch v\u00f4 c\u0103n c\u1ee9. Ch\u00fang ta bi\u1ebft kh\u1ea3 n\u0103ng \u0111\u1ec3 h\u1ea1t v\u1eebng r\u01a1i v\u00e0o b\u00ean trong v\u00f2ng tr\u00f2n<\/p>\n\n\n\n
V\u00ec di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u00e0 1 m2 n\u00ean<\/p>\n\n\n\n
Di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n b\u1eb1ng x\u00e1c su\u1ea5t s\u1ed1 h\u1ea1t v\u1eebng r\u01a1i v\u00e0o b\u00ean trong v\u00f2ng tr\u00f2n<\/p>\n\n\n\n
Vi\u1ec7c s\u1eed d\u1ee5ng m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p mang t\u00ednh may r\u1ee7i (ph\u01b0\u01a1ng ph\u00e1p ng\u1eabu nhi\u00ean) \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t v\u1ea5n \u0111\u1ec1 to\u00e1n h\u1ecdc x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 ph\u01b0\u01a1ng ph\u00e1p Montecarlo n\u1ed5i ti\u1ebfng. C\u00f3 \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng ph\u00e1p Montecarlo ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 qua m\u00f4 h\u00ecnh s\u1ef1 ki\u1ec7n may r\u1ee7i \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c quy lu\u1eadt to\u00e1n h\u1ecdc x\u00e1c \u0111\u1ecbnh.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: X\u00e1c su\u1ea5t; Ph\u01b0\u01a1ng ph\u00e1p Montecarlo.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
B\u1ea1n \u0111\u00e3 t\u1eebng nghe n\u00f3i \u0111\u1ebfn vi\u1ec7c d\u00f9ng th\u00ed nghi\u1ec7m \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n ch\u01b0a? L\u1ea5y m\u1ed9t t\u1edd gi\u1ea5y tr\u1eafng di\u1ec7n t\u00edch 1 m2. Trong t\u1edd gi\u1ea5y ta v\u1ebd v\u00f2ng tr\u00f2n \u0111\u01b0\u1eddng k\u00ednh 1 m (nh\u01b0 h\u00ecnh v\u1ebd). V\u00f2ng tr\u00f2n s\u1ebd ti\u1ebfp x\u00fac v\u1edbi h\u00ecnh vu\u00f4ng t\u1ea1i m\u1ed9t \u0111i\u1ec3m tr\u00ean m\u1ed7i c\u1ea1nh c\u1ee7a […]<\/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":[15,9],"tags":[],"class_list":["post-7692","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7692","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=7692"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7692\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}