{"common":{"save":0,"post_id":"5641","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6775","post_id":"5641","mon_id":"1158532","chapter_id":"1158544","question":"<p>K\u1ebft qu\u1ea3 c\u1ee7a phép tính sau khi rút g\u1ecdn phân s\u1ed1 là:<\/p><p><span class=\"math-tex\">$\\dfrac{-12}{15} + \\dfrac{12}{10} = $<\/span><span class=\"frac123\"><span class=\"ts\"><input class=\"tim_x input_number\" type=\"text\" \/><\/span><span class=\"ms\"><input class=\"tim_x input_number\" type=\"text\" \/><\/span><\/span><\/p>","options":"","correct":["[\"2\",\"5\"]"],"level":"1","hint":"<p>Ta có th\u1ec3 c\u1ed9ng tr\u1eeb hai s\u1ed1 h\u1eefu t\u1ec9 b\u1eb1ng cách vi\u1ebft chúng d\u01b0\u1edbi d\u1ea1ng phân s\u1ed1 r\u1ed3i áp d\u1ee5ng các quy t\u1eafc c\u1ed9ng, tr\u1eeb phân s\u1ed1.<br \/> <\/p>","answer":"<p>Ta có:<br \/><span class=\"math-tex\">$\\dfrac{-12}{15} + \\dfrac{12}{10} $<\/span><br \/><span class=\"math-tex\">$= \\dfrac{-4}{5} + \\dfrac{6}{5}$<\/span> <br \/><span class=\"math-tex\">$=\\dfrac{-4+6}{5}$<\/span><br \/><span class=\"math-tex\">$=\\dfrac{2}{5}$<\/span><br \/>V\u1eady các s\u1ed1 c\u1ea7n \u0111i\u1ec1n l\u1ea7n l\u01b0\u1ee3t là <span style=\"color:#16a085;\">2 và 5<\/span> (phân s\u1ed1 <span class=\"math-tex\">$ \\dfrac{2}{5} $<\/span>)<br \/> <\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"3","date":"2022-03-29 07:09:27"},{"id":"6776","post_id":"5641","mon_id":"1158532","chapter_id":"1158544","question":"<p>Tính: <br \/><span class=\"math-tex\">$\\dfrac{-2}{7} - \\dfrac{3}{4} + \\dfrac{9}{7} - \\dfrac{1}{4} $<\/span> = <input class=\"_tit_hoi\" disabled=\"disabled\" type=\"text\"\/><\/p>","options":["1","2","0","3"],"correct":"3","level":"1","hint":"<p>Phép c\u1ed9ng các s\u1ed1 h\u1eefu t\u1ec9 c\u0169ng có tính ch\u1ea5t giao hoán và k\u1ebft h\u1ee3p gi\u1ed1ng phép c\u1ed9ng phân s\u1ed1.<br \/> <\/p>","answer":"<p>Ta có: <br \/> <span class=\"math-tex\">$\\dfrac{-2}{7} - \\dfrac{3}{4} + \\dfrac{9}{7} - \\dfrac{1}{4}$<\/span><\/p><p>Áp d\u1ee5ng tính ch\u1ea5t giao hoán, ta có:<br \/><span class=\"math-tex\">$=\\dfrac{-2}{7} + \\dfrac{9}{7} - \\dfrac{3}{4} - \\dfrac{1}{4}$<\/span><br \/><span class=\"math-tex\">$=\\left( \\dfrac{-2}{7} + \\dfrac{9}{7} \\right) - \\left( \\dfrac{3}{4} + \\dfrac{1}{4} \\right)$<\/span><br \/><span class=\"math-tex\">$= \\dfrac{7}{7} - \\dfrac{4}{4}$<\/span><br \/>= 1 - 1<\/p><p>= 0<br \/>\u0110áp án \u0111úng là<span style=\"color:#16a085;\"> 0<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2022-03-29 07:12:26","option_type":"number","len":0},{"id":"6777","post_id":"5641","mon_id":"1158532","chapter_id":"1158544","question":"<p>K\u1ebft qu\u1ea3 c\u1ee7a phép tính<br \/><span class=\"math-tex\">$\\dfrac{3}{8} - \\dfrac{7}{16}$<\/span><br \/> <\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{-1}{16}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{16}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{8}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{-1}{8}$<\/span>"],"correct":"1","level":"1","hint":"<p>Ta có th\u1ec3 c\u1ed9ng tr\u1eeb hai s\u1ed1 h\u1eefu t\u1ec9 b\u1eb1ng cách vi\u1ebft chúng d\u01b0\u1edbi d\u1ea1ng phân s\u1ed1 r\u1ed3i áp d\u1ee5ng các quy t\u1eafc c\u1ed9ng, tr\u1eeb phân s\u1ed1.<br \/> <\/p>","answer":"<p>Ta có: <br \/><span class=\"math-tex\">$\\dfrac{3}{8} - \\dfrac{7}{16}$<\/span><br \/><span class=\"math-tex\">$=\\dfrac{6}{16} - \\dfrac{7}{16}$<\/span><br \/><span class=\"math-tex\">$=\\dfrac{6-7}{16} $<\/span><br \/><span class=\"math-tex\">$= \\dfrac{-1}{16}$<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{-1}{16}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2022-03-29 07:15:29","option_type":"math","len":0}]}