{"common":{"save":0,"post_id":"5660","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6923","post_id":"5660","mon_id":"1158532","chapter_id":"1158544","question":"<p>Tìm s\u1ed1 h\u1eefu t\u1ec9 x bi\u1ebft r\u1eb1ng t\u1ed5ng c\u1ee7a 5x và 7,5 b\u1eb1ng 90.<\/p>","options":["<strong>A. <\/strong>x = 16,5","<strong>B.<\/strong> x = -16,5","<strong>C.<\/strong> x = 19,5","<strong>D.<\/strong> x = -19,5"],"correct":"1","level":"2","hint":"","answer":"<p>T\u1eeb \u0111\u1ec1 bài ta có<\/p><p>5x + 7,5 = 90<\/p><p>5x = 90 - 7,5<\/p><p>5x = 82,5<\/p><p> x = 82,5 : 5<\/p><p> x = 16,5<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>A. <\/strong>x = 16,5<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-05 08:30:06","option_type":"txt","len":1},{"id":"6925","post_id":"5660","mon_id":"1158532","chapter_id":"1158544","question":"<p>Tính giá tr\u1ecb c\u1ee7a M b\u1eb1ng cách h\u1ee3p lí<\/p><p>M = <span class=\"math-tex\">$\\left( \\dfrac{17}{16}-\\dfrac{1}{8} +\\dfrac{7}{13}\\right)-\\left( \\dfrac{11}{16}+\\dfrac{7}{8}-\\dfrac{8}{13} \\right)-\\left( \\dfrac{6}{16}+3+\\dfrac{15}{13} \\right)$<\/span><\/p><p>\u0110áp s\u1ed1 M = <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/><\/p>","options":"","correct":["[\"-4\"]"],"level":"2","hint":"","answer":"<p>M = <span class=\"math-tex\">$\\left( \\dfrac{17}{16}-\\dfrac{1}{8} +\\dfrac{7}{13}\\right)-\\left( \\dfrac{11}{16}+\\dfrac{7}{8}-\\dfrac{8}{13} \\right)-\\left( \\dfrac{6}{16}+3+\\dfrac{15}{13} \\right)$<\/span><\/p><p>= <span class=\"math-tex\">$ \\dfrac{17}{16}-\\dfrac{1}{8} +\\dfrac{7}{13}-\\dfrac{11}{16}-\\dfrac{7}{8}+\\dfrac{8}{13} - \\dfrac{6}{16}-3-\\dfrac{15}{13} $<\/span> <\/p><p>= <span class=\"math-tex\">$ \\dfrac{17}{16}-\\dfrac{11}{16} - \\dfrac{6}{16} - \\dfrac{1}{8} -\\dfrac{7}{8}+\\dfrac{7}{13}+\\dfrac{8}{13} -\\dfrac{15}{13} -3$<\/span><\/p><p>= <span class=\"math-tex\">$\\left( \\dfrac{17}{16}-\\dfrac{11}{16} - \\dfrac{6}{16} \\right) - \\left( \\dfrac{1}{8} + \\dfrac{7}{8} \\right) + \\left(\\dfrac{7}{13}+\\dfrac{8}{13} -\\dfrac{15}{13} \\right) -3$<\/span> <\/p><p>= <span class=\"math-tex\">$0 -\\dfrac{8}{8}+0-3$<\/span><\/p><p>= <span class=\"math-tex\">$-1-3 = -4$<\/span><\/p><p>V\u1eady M = -4<\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là <span style=\"color:#16a085;\"> -4<\/span><\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2022-04-05 08:41:21"},{"id":"6926","post_id":"5660","mon_id":"1158532","chapter_id":"1158544","question":"<p>Tìm s\u1ed1 h\u1eefu t\u1ec9 y bi\u1ebft hi\u1ec7u c\u1ee7a 9 và 6y b\u1eb1ng 78.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$y = \\dfrac{23}{2}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$y = \\dfrac{-23}{2}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$y= \\dfrac{29}{2}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$y = \\dfrac{-29}{2}$<\/span>"],"correct":"2","level":"2","hint":"","answer":"<p>Theo \u0111\u1ec1 bài ta có<\/p><p>9 - 6y = 78<\/p><p> - 6y = 78 - 9<\/p><p> - 6y = 69<\/p><p> y = 69 : (-6)<\/p><p> y = <span class=\"math-tex\">$ \\dfrac{-69}{6}$<\/span><\/p><p> y = <span class=\"math-tex\">$\\dfrac{-23}{2}$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$y = \\dfrac{-23}{2}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-05 08:47:27","option_type":"math","len":0}]}