{"common":{"save":0,"post_id":"4760","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7823","post_id":"4760","mon_id":"1158113","chapter_id":"1158119","question":"<p>T&igrave;m x bi\u1ebft<\/p><p><span class=\"math-tex\">$\\dfrac{x}{13}=\\dfrac{-3}{39}$<\/span><\/p>","options":["x = 1","x = -1","x = 2","x = -2"],"correct":"2","level":"2","hint":"<p>&Aacute;p d\u1ee5ng quy t\u1eafc b\u1eb1ng nhau c\u1ee7a hai ph&acirc;n s\u1ed1&nbsp;<\/p><p><span class=\"math-tex\">$\\dfrac{a}{b}=\\dfrac{c}{d}$<\/span>&nbsp; n\u1ebfu a . d = b . c<\/p>","answer":"<p>V&igrave;&nbsp; &nbsp;<span class=\"math-tex\">$\\dfrac{x}{13}=\\dfrac{-3}{39}$<\/span>&nbsp; n&ecirc;n&nbsp; x . 39 = 13 . (-3) = -39&nbsp; suy ra x = (-39) : 39 = -1<\/p><p>V\u1eady x = -1<\/p><p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp;&nbsp;<span style=\"color:#16a085;\"><strong>x = -1<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-09-30 03:28:09","option_type":"txt","len":0},{"id":"7825","post_id":"4760","mon_id":"1158113","chapter_id":"1158119","question":"<p>Ch\u1ecdn ph&eacute;p so s&aacute;nh <strong>\u0111&uacute;ng<\/strong><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{18}{26}=\\dfrac{9}{14}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{-25}{30}=\\dfrac{-5}{6}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{36}{14}=\\dfrac{18}{5}$<\/span>"],"correct":"2","level":"2","hint":"<p>&Aacute;p d\u1ee5ng t&iacute;nh ch\u1ea5t chia c\u1ea3 t\u1eed v&agrave; m\u1eabu c\u1ee7a m\u1ed9t ph&acirc;n s\u1ed1 v\u1edbi c&ugrave;ng m\u1ed9t \u01b0\u1edbc chung c\u1ee7a ch&uacute;ng \u0111\u1ec3 r&uacute;t g\u1ecdn&nbsp;ph&acirc;n s\u1ed1 th\u1ee9 nh\u1ea5t r\u1ed3i ki\u1ec3m tra xem n&oacute; c&oacute; b\u1eb1ng ph&acirc;n s\u1ed1 th\u1ee9 hai hay kh&ocirc;ng.<\/p>","answer":"<p><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{18}{26}=\\dfrac{9}{14}$<\/span>&nbsp; (<span style=\"color:#c0392b;\">sai <\/span>v&igrave;&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{18}{26}=\\dfrac{18:2}{26:2}=\\dfrac{9}{13}$<\/span>)<\/p><p><strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{-25}{30}=\\dfrac{-5}{6}$<\/span>&nbsp; (<span style=\"color:#16a085;\">\u0111&uacute;ng <\/span>v&igrave;&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{-25}{30}=\\dfrac{-25:5}{30:5}=\\dfrac{-5}{6}$<\/span>&nbsp;)<\/p><p><strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{36}{14}=\\dfrac{18}{5}$<\/span>&nbsp; (<span style=\"color:#c0392b;\">sai <\/span>v&igrave;&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{36}{14}=\\dfrac{36:2}{14:2}=\\dfrac{18}{7}$<\/span>&nbsp;)<\/p><p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp; &nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{-25}{30}=\\dfrac{-5}{6}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-09-30 03:34:48","option_type":"math","len":0},{"id":"7827","post_id":"4760","mon_id":"1158113","chapter_id":"1158119","question":"<p>T&igrave;m s\u1ed1 nguy&ecirc;n x bi\u1ebft<\/p><p><span class=\"math-tex\">$\\dfrac{8}{x}=\\dfrac{6}{-9}$<\/span><\/p>","options":["x = -12","x = 12"],"correct":"1","level":"2","hint":"<p>Hai ph&acirc;n s\u1ed1&nbsp; <span class=\"math-tex\">$\\dfrac{a}{b}$<\/span>&nbsp;v&agrave;&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{c}{d}$<\/span> &nbsp;b\u1eb1ng nhau n\u1ebfu a . d = b . c<\/p>","answer":"<p>V&igrave;&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{8}{x}=\\dfrac{6}{-9}$<\/span>&nbsp;n&ecirc;n 8 . (-9) = x . 6&nbsp; hay&nbsp; -72 = 6x. Suy ra x = (-72) : 6 = -12<\/p><p>V\u1eady x = -12<\/p><p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp;<span style=\"color:#16a085;\"><strong> &nbsp;x = -12<\/strong><\/span><\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"131","test":"1","date":"2021-09-30 03:39:32","option_type":"txt","len":0}]}