Th\u00f4ng th\u01b0\u1eddng, \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi n\u00e0y b\u1ea1n ph\u1ea3i bi\u1ebft m\u1ed1i quan h\u1ec7 gi\u1eefa nhi\u1ec7t \u0111\u1ed9 C v\u00e0 nhi\u1ec7t \u0111\u1ed9 F?<\/p>\n\n\n\n
F = 9\/5C + 32<\/p>\n\n\n\n
Thay C = 10 v\u00e0o c\u00f4ng th\u1ee9c ta t\u00ednh \u0111\u01b0\u1ee3c F = 50. Th\u1ebf nh\u01b0ng n\u1ebfu b\u1ea1n d\u00f9ng lo\u1ea1i nhi\u1ec7t k\u1ebf c\u00f3 chia \u0111\u1ed9 theo nhi\u1ec7t \u0111\u1ed9 F b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ecdc tr\u1ef1c ti\u1ebfp k\u1ebft qu\u1ea3. Nh\u01b0ng c\u0169ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n nh\u1edd c\u00e1c h\u1ec7 \u0111\u01b0\u1eddng \u0111\u1eb7c bi\u1ec7t g\u1ecdi l\u00e0 to\u00e1n \u0111\u1ed3 th\u00ec s\u1ebd v\u00f4 c\u00f9ng thu\u1eadn ti\u1ec7n: Nh\u1edd to\u00e1n \u0111\u1ed3 ta kh\u00f4ng ph\u1ea3i d\u00f9ng c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n m\u00e0 \u0111\u1ecdc \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 tr\u1ef1c ti\u1ebfp tr\u00ean to\u00e1n \u0111\u1ed3. \u0110\u00f3 l\u00e0 \u01b0u \u0111i\u1ec3m n\u1ed5i b\u1eadt c\u1ee7a ph\u01b0\u01a1ng ph\u00e1p to\u00e1n \u0111\u1ed3. To\u00e1n \u0111\u1ed3 d\u00f9ng cho nhi\u1ec7t k\u1ebf l\u00e0 lo\u1ea1i to\u00e1n \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n nh\u1ea5t, ng\u01b0\u1eddi ta c\u0169ng g\u1ecdi l\u00e0 \u0111\u1ed3 th\u1ecb N\u00f4m\u00f4.<\/p>\n\n\n\n
Ta h\u00e3y x\u00e9t m\u1ed9t v\u00ed d\u1ee5 kh\u00e1c: Khi \u0111\u1ea5u song song hai \u0111i\u1ec7n tr\u1edf 5 k\u03a9 v\u00e0 7,5 k\u03a9, t\u00ednh \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a m\u1ea1ch \u0111\u00f3?<\/p>\n\n\n\n
Ta t\u00ednh \u0111i\u1ec7n tr\u1edf t\u01b0\u01a1ng \u0111\u01b0\u01a1ng theo c\u00f4ng th\u1ee9c: 1\/R = 1\/R1 + 1\/R2 v\u00e0 c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c ngay R = 3 K\u03a9. Th\u1ebf li\u1ec7u c\u00f3 th\u1ec3 thi\u1ebft l\u1eadp m\u1ed9t to\u00e1n \u0111\u1ed3 \u0111\u1ec3 t\u00ednh kh\u00f4ng?<\/p>\n\n\n\n
Tr\u01b0\u1edbc h\u1ebft ta v\u1ebd m\u1ed9t g\u00f3c 120o v\u00e0 \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c c\u1ee7a g\u00f3c. Chia \u0111\u1ed9 v\u1edbi \u0111\u01a1n v\u1ecb d\u00e0i nh\u01b0 nhau tr\u00ean hai c\u1ea1nh v\u00e0 tr\u00ean ph\u00e2n gi\u00e1c, ta \u0111\u01b0\u1ee3c m\u1ed9t to\u00e1n \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n. Khi s\u1eed d\u1ee5ng ch\u1ec9 c\u1ea7n d\u00f9ng th\u01b0\u1edbc n\u1ed1i hai \u0111i\u1ec3m 7,5 v\u00e0 5 tr\u00ean hai c\u1ea1nh. \u0110\u01b0\u1eddng th\u1eb3ng c\u1eaft ph\u00e2n gi\u00e1c t\u1ea1i \u0111i\u1ec3m n\u00e0o, \u0111\u00f3 ch\u00ednh l\u00e0 gi\u00e1 tr\u1ecb R c\u1ea7n t\u00ecm. Theo \u0111\u1ed3 th\u1ecb ta c\u00f3 th\u1ec3 t\u00ecm th\u1ea5y R = 3.<\/p>\n\n\n\n
Ch\u1eafc c\u00e1c b\u1ea1n c\u0169ng s\u1ebd ch\u00fa \u00fd m\u1ed9t \u0111i\u1ec1u l\u00e0 khi \u0111\u1ecdc tr\u00ean \u0111\u1ed3 th\u1ecb lo\u1ea1i n\u00e0y th\u00ec vi\u1ec7c \u0111\u1ecdc c\u00e1c s\u1ed1 l\u1ebb kh\u00f3 ch\u00ednh x\u00e1c, v\u00ec v\u1eady gi\u00e1 tr\u1ecb t\u00ecm \u0111\u01b0\u1ee3c ch\u1ec9 l\u00e0 g\u1ea7n \u0111\u00fang. Nh\u01b0ng trong th\u1ef1c t\u1ebf th\u00ec c\u00e1c gi\u00e1 tr\u1ecb g\u1ea7n \u0111\u00fang n\u00e0y c\u0169ng \u0111\u1ee7 \u0111\u1ec3 l\u00e0m vi\u1ec7c.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Ph\u01b0\u01a1ng ph\u00e1p to\u00e1n \u0111\u1ed3; \u0110\u1ed3 th\u1ecb N\u00f4m\u00f4.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
Th\u00f4ng th\u01b0\u1eddng, \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi n\u00e0y b\u1ea1n ph\u1ea3i bi\u1ebft m\u1ed1i quan h\u1ec7 gi\u1eefa nhi\u1ec7t \u0111\u1ed9 C v\u00e0 nhi\u1ec7t \u0111\u1ed9 F? F = 9\/5C + 32 Thay C = 10 v\u00e0o c\u00f4ng th\u1ee9c ta t\u00ednh \u0111\u01b0\u1ee3c F = 50. Th\u1ebf nh\u01b0ng n\u1ebfu b\u1ea1n d\u00f9ng lo\u1ea1i nhi\u1ec7t k\u1ebf c\u00f3 chia \u0111\u1ed9 theo nhi\u1ec7t \u0111\u1ed9 F […]<\/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-7589","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\/7589","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=7589"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7589\/revisions"}],"predecessor-version":[{"id":17090,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7589\/revisions\/17090"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7589"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7589"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7589"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}