{"id":7479,"date":"2021-11-20T13:52:41","date_gmt":"2021-11-20T06:52:41","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=7479"},"modified":"2021-11-20T15:09:09","modified_gmt":"2021-11-20T08:09:09","slug":"phai-chang-so-0-chi-co-nghia-la-khong-co","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/phai-chang-so-0-chi-co-nghia-la-khong-co\/","title":{"rendered":"Ph\u1ea3i ch\u0103ng s\u1ed1 0 ch\u1ec9 c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3?"},"content":{"rendered":"\n<p>Trong m\u1ed9t l\u1edbp h\u1ecdc, th\u1ea7y gi\u00e1o d\u1ea1y to\u00e1n \u0111\u1eb7t ra cho <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> m\u1ed9t b\u00e0i to\u00e1n: \u201c\u1edf m\u1ed9t c\u1eeda h\u00e0ng b\u00e1n m\u00e1y t\u00ednh v\u00e0o \u0111\u1ea7u tu\u1ea7n c\u00f3 20 m\u00e1y t\u00ednh.<\/p>\n\n\n\n<p>Trong su\u1ed1t m\u1ed9t tu\u1ea7n c\u1eeda h\u00e0ng ch\u1ec9 c\u00f3 b\u00e1n ki\u1ec3u m\u00e1y t\u00ednh n\u00e0y m\u00e0 kh\u00f4ng h\u1ec1 nh\u1eadp m\u1ed9t m\u00e1y n\u00e0o. V\u1eady n\u1ebfu c\u1eeda h\u00e0ng s\u1ebd c\u00f2n bao nhi\u00eau m\u00e1y t\u00ednh ki\u1ec3u n\u00e0y khi \u0111\u00e3 b\u00e1n h\u1ebft 20 c\u00e1i. C\u00e1c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> nhanh ch\u00f3ng cho c\u00e2u tr\u1ea3 l\u1eddi: 20 c\u00e1i &#8211; 20 c\u00e1i = 0. \u1ede \u0111\u00e2y ta c\u00f3 m\u1ed9t \u0111\u1ecbnh ngh\u0129a v\u1ec1 s\u1ed1 0: \u201cs\u1ed1 0 c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3 g\u00ec\u201d.<\/p>\n\n\n\n<p>Nh\u01b0 v\u1eady th\u00f4ng th\u01b0\u1eddng s\u1ed1 0 c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3. Th\u1ebf nh\u01b0ng c\u00f3 ph\u1ea3i s\u1ed1 0 ch\u1ec9 h\u00e0m \u00fd l\u00e0 kh\u00f4ng c\u00f3, li\u1ec7u ngo\u00e0i \u00fd ngh\u0129a kh\u00f4ng c\u00f3, s\u1ed1 kh\u00f4ng c\u00f3 c\u00f2n h\u00e0m \u00fd g\u00ec kh\u00e1c n\u1eefa kh\u00f4ng?<\/p>\n\n\n\n<p>Trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y, nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed ngo\u00e0i tr\u1eddi lu\u00f4n thay \u0111\u1ed5i theo th\u1eddi ti\u1ebft, theo m\u00f9a. V\u00e0o m\u00f9a \u0111\u00f4ng, nhi\u1ec7t \u0111\u1ed9 ngo\u00e0i tr\u1eddi \u1edf c\u00e1c x\u1ee9 l\u1ea1nh th\u01b0\u1eddng thay \u0111\u1ed5i tr\u00ean d\u01b0\u1edbi 0\u00b0C. V\u1eady th\u00ec 0\u00b0C li\u1ec7u c\u00f3 c\u00f2n c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3 nhi\u1ec7t \u0111\u1ed9? \u0110\u01b0\u01a1ng nhi\u00ean kh\u00f4ng ph\u1ea3i nh\u01b0 v\u1eady. N\u1ebfu nh\u01b0 0\u00b0C (nhi\u1ec7t \u0111\u1ed9 theo thang \u0111o Celsius) c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ebf th\u00ec 0\u00b0F (nhi\u1ec7t \u0111\u1ed9 \u0111o theo thang Fahrenheit) s\u1ebd h\u00e0m \u00fd \u0111i\u1ec1u g\u00ec, c\u00f3 ph\u1ea3i l\u1ea1i c\u00f3 ngh\u0129a kh\u00f4ng c\u00f3 nhi\u1ec7t \u0111\u1ed9? 0\u00b0F ch\u00ednh l\u00e0 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n 0\u00b0C 177\u00b0\/9 , c\u00f2n 0\u00b0C l\u00e0 nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n 0\u00b0F 177\u00b0\/9 m\u00e0 kh\u00f4ng th\u1ec3 n\u00f3i 0\u00b0 l\u00e0 kh\u00f4ng c\u00f3 nhi\u1ec7t \u0111\u1ed9. Th\u1ebf th\u00ec ta ph\u1ea3i gi\u1ea3i quy\u1ebft m\u00e2u thu\u1eabn n\u00e0y nh\u01b0 th\u1ebf n\u00e0o \u0111\u00e2y?<\/p>\n\n\n\n<p>B\u1ea3n th\u00e2n s\u1ed1 0 c\u00f3 \u0111\u1ea7y r\u1eaby m\u00e2u thu\u1eabn. N\u1ebfu \u0111\u1ee9ng t\u1eeb quan \u0111i\u1ec3m t\u00e1c d\u1ee5ng c\u1ee7a s\u1ed1 0 m\u00e0 x\u00e9t th\u00ec khi l\u00e0m ph\u00e9p t\u00ednh c\u1ed9ng nhi\u1ec1u l\u1ea7n s\u1ed1 kh\u00f4ng v\u1edbi nhau th\u00ec t\u1ed5ng s\u1ed1 thu \u0111\u01b0\u1ee3c v\u1eabn l\u00e0 s\u1ed1 0. Th\u1ebf c\u00f3 ph\u1ea3i s\u1ed1 0 l\u00e0 s\u1ed1 qu\u00e1 b\u00e9 kh\u00f4ng? M\u1eb7t kh\u00e1c ch\u00fang ta bi\u1ebft l\u00e0 s\u1ed1 0 c\u00f3 \u1ea3nh h\u01b0\u1edfng r\u1ea5t l\u1edbn. D\u00f9 cho m\u1ed9t t\u00edch s\u1ed1 c\u00f3 bao nhi\u00eau th\u1eeba s\u1ed1 \u0111i n\u1eefa ch\u1ec9 c\u1ea7n c\u00f3 m\u1ed9t th\u1eeba s\u1ed1 l\u00e0 s\u1ed1 0 th\u00ec t\u00edch s\u1ed1 thu \u0111\u01b0\u1ee3c s\u1ebd b\u1eb1ng 0. B\u1ea1n th\u1ea5y s\u1ed1 0 \u1ea3nh h\u01b0\u1edfng c\u00f3 l\u1edbn kh\u00f4ng? Nh\u1eefng m\u00e2u thu\u1eabn lo\u1ea1i n\u00e0y trong to\u00e1n h\u1ecdc kh\u00f4ng ph\u1ea3i \u00edt. \u0110\u1ec3 gi\u1ea3i quy\u1ebft m\u00e2u thu\u1eabn n\u00e0y, ch\u00fang ta c\u1ea7n bi\u1ebft t\u00ednh t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a c\u00e1c kh\u00e1i ni\u1ec7m to\u00e1n h\u1ecdc, c\u00e1c kh\u00e1i ni\u1ec7m to\u00e1n h\u1ecdc kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ea5t bi\u1ebfn m\u00e0 lu\u00f4n thay \u0111\u1ed5i. \u0110\u1ed1i v\u1edbi <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> ti\u1ec3u h\u1ecdc th\u00ec s\u1ed1 0 c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3, c\u00f2n \u0111\u1ed1i v\u1edbi <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> b\u1eadc trung h\u1ecdc th\u00ec s\u1ed1 0 c\u00f3 th\u1ec3 h\u00e0m \u00fd m\u1ed9t s\u1ef1 kh\u1edfi \u0111\u1ea7u. Khi ti\u1ebfn h\u00e0nh c\u00e1c ph\u00e9p t\u00ednh s\u1ed1 h\u1ecdc, s\u1ed1 0 c\u00f3 vai tr\u00f2 r\u1ea5t l\u1edbn. Trong c\u00e1c m\u00e1y t\u00ednh \u0111i\u1ec7n t\u1eed th\u00ec vai tr\u00f2 c\u1ee7a s\u1ed1 0 l\u1ea1i c\u00e0ng l\u1edbn v\u00ec trong m\u00e1y t\u00ednh \u0111i\u1ec7n t\u1eed c\u00e1c ph\u00e9p to\u00e1n \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo h\u1ec7 \u0111\u1ebfm c\u01a1 s\u1ed1 2, b\u1ea5t k\u00ec c\u00e1c ph\u00e9p t\u00ednh n\u00e0o \u0111\u1ec1u th\u1ef1c hi\u1ec7n d\u1ef1a v\u00e0o s\u1ed1 0 v\u00e0 s\u1ed1 1.<\/p>\n\n\n\n<p>T\u1eeb kho\u00e1: S\u1ed1 0.<\/p>\n\n\n\n<p><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Trong m\u1ed9t l\u1edbp h\u1ecdc, th\u1ea7y gi\u00e1o d\u1ea1y to\u00e1n \u0111\u1eb7t ra cho h\u1ecdc sinh m\u1ed9t b\u00e0i to\u00e1n: \u201c\u1edf m\u1ed9t c\u1eeda h\u00e0ng b\u00e1n m\u00e1y t\u00ednh v\u00e0o \u0111\u1ea7u tu\u1ea7n c\u00f3 20 m\u00e1y t\u00ednh. Trong su\u1ed1t m\u1ed9t tu\u1ea7n c\u1eeda h\u00e0ng ch\u1ec9 c\u00f3 b\u00e1n ki\u1ec3u m\u00e1y t\u00ednh n\u00e0y m\u00e0 kh\u00f4ng h\u1ec1 nh\u1eadp m\u1ed9t m\u00e1y n\u00e0o. V\u1eady n\u1ebfu c\u1eeda h\u00e0ng s\u1ebd [&hellip;]<\/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-7479","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\/7479","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=7479"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7479\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7479"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7479"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7479"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}