Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"4774","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7941","post_id":"4774","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tìm x bi\u1ebft<\/p><p>x + <span class=\"math-tex\">$\\dfrac{7}{26}$<\/span> = <span class=\"math-tex\">$\\dfrac{9}{13}$<\/span><\/p>","options":["x = <span class=\"math-tex\">$\\dfrac{11}{26}$<\/span>","x = <span class=\"math-tex\">$\\dfrac{-11}{26}$<\/span>"],"correct":"1","level":"1","hint":"<p>Tìm s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft = t\u1ed5ng - s\u1ed1 h\u1ea1ng \u0111ã bi\u1ebft<\/p>","answer":"<p>x + <span class=\"math-tex\">$\\dfrac{7}{26}$<\/span> = <span class=\"math-tex\">$\\dfrac{9}{13}$<\/span><\/p><p>x = <span class=\"math-tex\">$\\dfrac{9}{13}-\\dfrac{7}{26}$<\/span><\/p><p>x = <span class=\"math-tex\">$\\dfrac{18}{26}-\\dfrac{7}{26}$<\/span><\/p><p>x = <span class=\"math-tex\">$\\dfrac{11}{26}$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\">x = <span class=\"math-tex\">$\\dfrac{11}{26}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-10-01 07:09:45","option_type":"math","len":0},{"id":"7943","post_id":"4774","mon_id":"1158113","chapter_id":"1158119","question":"<p>Ch\u1ecdn phép tính cho k\u1ebft qu\u1ea3 <strong>\u0111úng<\/strong><\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$\\dfrac{-1}{9}+\\dfrac{-3}{9}=\\dfrac{-4}{9}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{15}{11}+\\dfrac{-13}{11}=\\dfrac{28}{11}$<\/span>"],"correct":"1","level":"1","hint":"<p>Mu\u1ed1n c\u1ed9ng hai phân s\u1ed1 có cùng m\u1eabu s\u1ed1 ta c\u1ed9ng các t\u1eed và gi\u1eef nguyên m\u1eabu.<\/p>","answer":"<p><strong>A. <\/strong><span class=\"math-tex\">$\\dfrac{-1}{9}+\\dfrac{-3}{9}=\\dfrac{-4}{9}$<\/span> (<span style=\"color:#16a085;\">\u0111úng<\/span>)<\/p><p><strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{15}{11}+\\dfrac{-13}{11}=\\dfrac{28}{11}$<\/span> (<span style=\"color:#c0392b;\">sai <\/span>vì <span class=\"math-tex\">$\\dfrac{15}{11}+\\dfrac{-13}{11}=\\dfrac{15 + (-13)}{11}=\\dfrac{-2}{11}$<\/span> ) <\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"> <strong>A. <\/strong><span class=\"math-tex\">$\\dfrac{-1}{9}+\\dfrac{-3}{9}=\\dfrac{-4}{9}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-10-01 07:13:07","option_type":"math","len":0},{"id":"7946","post_id":"4774","mon_id":"1158113","chapter_id":"1158119","question":"<p>Ch\u1ecdn phép tính cho k\u1ebft qu\u1ea3 <strong>\u0111úng<\/strong><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{-2}{5}-\\dfrac{-9}{5}=\\dfrac{-7}{5}$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$\\dfrac{3}{7}-\\dfrac{6}{7}=\\dfrac{-3}{7}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{5}{13}-\\dfrac{-2}{13}=\\dfrac{3}{13}$<\/span>"],"correct":"2","level":"1","hint":"<p>Mu\u1ed1n tr\u1eeb hai phân s\u1ed1 có cùng m\u1eabu ta tr\u1eeb các t\u1eed và gi\u1eef nguyên m\u1eabu.<\/p>","answer":"<p><strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{-2}{5}-\\dfrac{-9}{5}=\\dfrac{-7}{5}$<\/span> (<span style=\"color:#c0392b;\">sai<\/span> vì <span class=\"math-tex\">$\\dfrac{-2}{5}-\\dfrac{-9}{5}=\\dfrac{-2-(-9)}{5}=\\dfrac{-2+9}{5}=\\dfrac{7}{5}$<\/span> )<\/p><p><strong>B. <\/strong><span class=\"math-tex\">$\\dfrac{3}{7}-\\dfrac{6}{7}=\\dfrac{-3}{7}$<\/span> (<span style=\"color:#16a085;\">\u0111úng <\/span>vì <span class=\"math-tex\">$\\dfrac{3}{7}-\\dfrac{6}{7}=\\dfrac{3-6}{7}=\\dfrac{-3}{7}$<\/span> )<\/p><p><strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{5}{13}-\\dfrac{-2}{13}=\\dfrac{3}{13}$<\/span> (<span style=\"color:#c0392b;\">sai <\/span>vì <span class=\"math-tex\">$\\dfrac{5}{13}-\\dfrac{-2}{13}=\\dfrac{5-(-2)}{13}=\\dfrac{5+2}{13}=\\dfrac{7}{13}$<\/span> )<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B. <\/strong><span class=\"math-tex\">$\\dfrac{3}{7}-\\dfrac{6}{7}=\\dfrac{-3}{7}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-10-01 07:17:38","option_type":"math","len":0}]}