“Trong gia \u0111\u00ecnh, khi \u1edf xa b\u00e1c s\u0129 m\u00e0 mu\u1ed1n cho c\u00e1c ch\u00e1u u\u1ed1ng k\u1ecbp th\u1eddi nh\u1eefng thu\u1ed1c t\u00e2y th\u00f4ng th\u01b0\u1eddng c\u1ee7a ng\u01b0\u1eddi l\u1edbn, th\u00ec t\u00ednh to\u00e1n l\u00e0m sao \u0111\u1ec3 kh\u00f4ng qu\u00e1 li\u1ec1u quy \u0111\u1ecbnh?”.<\/p>\n\n\n\n
V\u1ec1 l\u00fd thuy\u1ebft, vi\u1ec7c quy \u0111\u1ecbnh li\u1ec1u l\u01b0\u1ee3ng thu\u1ed1c t\u00e2y ch\u00ednh x\u00e1c nh\u1ea5t l\u00e0 d\u1ef1a v\u00e0o th\u1ec3 tr\u1ecdng (c\u00e2n n\u1eb7ng) c\u1ee7a t\u1eebng ng\u01b0\u1eddi; nh\u01b0ng trong th\u1ef1c t\u1ebf, \u0111i\u1ec1u n\u00e0y \u00edt khi v\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c m\u1ed9t c\u00e1ch tri\u1ec7t \u0111\u1ec3. Ng\u01b0\u1eddi ta ph\u00e2n \u0111\u1ecbnh th\u00e0nh li\u1ec1u ng\u01b0\u1eddi l\u1edbn (tr\u00ean 17 tu\u1ed5i hay tr\u00ean 20 tu\u1ed5i t\u00f9y t\u00e1c gi\u1ea3) v\u00e0 li\u1ec1u cho tr\u1ebb em t\u00ednh theo tu\u1ed5i.<\/p>\n\n\n\n
Xin gi\u1edbi thi\u1ec7u v\u1edbi gia \u0111\u00ecnh b\u1ea1n m\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c v\u00e0 ph\u01b0\u01a1ng ph\u00e1p t\u00ednh \u0111\u1ec3 tham kh\u1ea3o v\u00e0 v\u1eadn d\u1ee5ng trong nh\u1eefng t\u00ecnh hu\u1ed1ng b\u1ee9c x\u00fac (, t\u1ed1t nh\u1ea5t l\u00e0 ph\u1ea3i \u0111\u1ec3 b\u00e1c s\u0129 quy\u1ebft \u0111\u1ecbnh vi\u1ec7c d\u00f9ng thu\u1ed1c g\u00ec, v\u1edbi li\u1ec1u l\u01b0\u1ee3ng bao nhi\u00eau v\u00e0 c\u00e1ch d\u00f9ng c\u1ee5 th\u1ec3 nh\u01b0 th\u1ebf n\u00e0o). 1. C\u00f4ng th\u1ee9c Dilling, s\u1eed d\u1ee5ng m\u1eabu s\u1ed1 20:<\/p>\n\n\n\n
Li\u1ec1u c\u1ee7a tr\u1ebb = (tu\u1ed5i\/20) x li\u1ec1u ng\u01b0\u1eddi l\u1edbn.<\/p>\n\n\n\n
V\u00ed d\u1ee5: Tr\u1ebb 10 tu\u1ed5i, thu\u1ed1c c\u1ee7a ng\u01b0\u1eddi l\u1edbn c\u00f3 li\u1ec1u t\u1ed1i \u0111a\/ng\u00e0y l\u00e0 200 mg, th\u00ec li\u1ec1u c\u1ee7a ch\u00e1u s\u1ebd l\u00e0: 10\/20 x 200 mg = 100 mg t\u1ed1i \u0111a\/ng\u00e0y).<\/p>\n\n\n\n
C\u00f4ng th\u1ee9c Dilling \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u00e0 th\u00edch h\u1ee3p nh\u1ea5t, g\u1ea7n kh\u1edbp v\u1edbi \u0111\u01b0\u1eddng bi\u1ec3u di\u1ec5n th\u1ec3 tr\u1ecdng. 2. C\u00f4ng th\u1ee9c Young, \u00e1p d\u1ee5ng cho tr\u1ebb d\u01b0\u1edbi 12 tu\u1ed5i, d\u00f9ng s\u1ed1 c\u1ed9ng 12:<\/p>\n\n\n\n
Li\u1ec1u c\u1ee7a tr\u1ebb = tu\u1ed5i c\u1ee7a tr\u1ebb \/(tu\u1ed5i c\u1ee7a tr\u1ebb + 12).<\/p>\n\n\n\n
V\u00ed d\u1ee5: Tr\u1ebb 8 tu\u1ed5i s\u1ebd c\u00f3 li\u1ec1u b\u1eb1ng 8\/(8+12) = 2\/5 li\u1ec1u ng\u01b0\u1eddi l\u1edbn. 3. C\u00f4ng th\u1ee9c Cowling, d\u00f9ng m\u1eabu s\u1ed1 24:<\/p>\n\n\n\n
Chia tu\u1ed5i c\u1ee7a tr\u1ebb v\u1edbi 24, s\u1ebd \u0111\u01b0\u1ee3c t\u1ef7 l\u1ec7 li\u1ec1u l\u01b0\u1ee3ng<\/p>\n\n\n\n
V\u00ed d\u1ee5: Tr\u1ebb 8 tu\u1ed5i s\u1ebd c\u00f3 li\u1ec1u b\u1eb1ng 8\/24 = 1\/3 c\u1ee7a ng\u01b0\u1eddi l\u1edbn. 4. C\u00f4ng th\u1ee9c Pincus Catzell, trong \u0111\u00f3 li\u1ec1u c\u1ee7a tr\u1ebb s\u01a1 sinh b\u1eb1ng 1\/8 li\u1ec1u c\u1ee7a ng\u01b0\u1eddi l\u1edbn; c\u1ee7a tr\u1ebb 12 th\u00e1ng b\u1eb1ng 1\/4; c\u1ee7a tr\u1ebb 7 tu\u1ed5i b\u1eb1ng 1\/2; c\u1ee7a tr\u1ebb 14 tu\u1ed5i b\u1eb1ng 3\/4 li\u1ec1u ng\u01b0\u1eddi l\u1edbn. 5. Ph\u01b0\u01a1ng ph\u00e1p Gaubius, trong \u0111\u00f3 li\u1ec1u c\u1ee7a tr\u1ebb d\u01b0\u1edbi 1 tu\u1ed5i b\u1eb1ng 1\/12 li\u1ec1u ng\u01b0\u1eddi l\u1edbn; d\u01b0\u1edbi 2 tu\u1ed5i b\u1eb1ng 1\/8; d\u01b0\u1edbi 3 tu\u1ed5i b\u1eb1ng 1\/6; d\u01b0\u1edbi 4 tu\u1ed5i b\u1eb1ng 1\/4; d\u01b0\u1edbi 7 tu\u1ed5i b\u1eb1ng 1\/3; d\u01b0\u1edbi 14 tu\u1ed5i b\u1eb1ng 1\/2; d\u01b0\u1edbi 20 tu\u1ed5i b\u1eb1ng 2\/3 li\u1ec1u ng\u01b0\u1eddi l\u1edbn.<\/p>\n","protected":false},"excerpt":{"rendered":"
“Trong gia \u0111\u00ecnh, khi \u1edf xa b\u00e1c s\u0129 m\u00e0 mu\u1ed1n cho c\u00e1c ch\u00e1u u\u1ed1ng k\u1ecbp th\u1eddi nh\u1eefng thu\u1ed1c t\u00e2y th\u00f4ng th\u01b0\u1eddng c\u1ee7a ng\u01b0\u1eddi l\u1edbn, th\u00ec t\u00ednh to\u00e1n l\u00e0m sao \u0111\u1ec3 kh\u00f4ng qu\u00e1 li\u1ec1u quy \u0111\u1ecbnh?”. V\u1ec1 l\u00fd thuy\u1ebft, vi\u1ec7c quy \u0111\u1ecbnh li\u1ec1u l\u01b0\u1ee3ng thu\u1ed1c t\u00e2y ch\u00ednh x\u00e1c nh\u1ea5t l\u00e0 d\u1ef1a v\u00e0o th\u1ec3 tr\u1ecdng (c\u00e2n n\u1eb7ng) […]<\/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":[21],"tags":[],"class_list":["post-12291","post","type-post","status-publish","format-standard","hentry","category-y-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/12291","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=12291"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/12291\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=12291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=12291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=12291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}