Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"4571","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6615","post_id":"4571","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tìm m\u1ed9t s\u1ed1 bi\u1ebft <span class=\"frac123\"><span class=\"ts\">4<\/span><span class=\"ms\">7<\/span><\/span> c\u1ee7a s\u1ed1 \u0111ó là 44.<\/p><p><strong>S\u1ed1 \u0111ó là<\/strong> <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/> .<\/p>","options":"","correct":["[\"77\"]"],"level":"1","hint":"<p>Mu\u1ed1n tìm m\u1ed9t s\u1ed1 khi bi\u1ebft <span class=\"math-tex\">$\u200b\u200b\\dfrac{m}{n}$<\/span> c\u1ee7a s\u1ed1 \u0111ó là a, ta tính <span class=\"math-tex\">$a:\\dfrac{m}{n}$<\/span> .<\/p>","answer":"<p>Vì <span class=\"math-tex\">$\\dfrac{4}{7}$<\/span> c\u1ee7a s\u1ed1 \u0111ó là 44 nên s\u1ed1 \u0111ó là <span class=\"math-tex\">$44:\\dfrac{4}{7}=44.\\dfrac{7}{4} = 11.7=$<\/span><span style=\"color:#16a085;\"><strong> 77<\/strong><\/span><\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là <strong><span style=\"color:#16a085;\"> 77<\/span><\/strong> .<\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2021-08-26 14:01:49"},{"id":"6616","post_id":"4571","mon_id":"1158113","chapter_id":"1158119","question":"<p>\u0110\u1ed5i phân s\u1ed1 <span class=\"frac123\"><span class=\"ts\">33<\/span><span class=\"ms\">7<\/span><\/span> sang h\u1ed7n s\u1ed1.<\/p>","options":["<span class=\"math-tex\">$5\\dfrac{4}{7}$<\/span>","<span class=\"math-tex\">$4\\dfrac{5}{7}$<\/span>","<span class=\"math-tex\">$7\\dfrac{5}{4}$<\/span>"],"correct":"2","level":"1","hint":"<p>N\u1ebfu a chia cho b \u0111\u01b0\u1ee3c th\u01b0\u01a1ng là q và s\u1ed1 d\u01b0 là r thì phân s\u1ed1 <span class=\"math-tex\">$\u200b\u200b\\dfrac{a}{b}$<\/span> = <span class=\"math-tex\">$q+\\dfrac{r}{b} = q\\dfrac{r}{b}$<\/span> v\u1edbi a, b, q, r là các s\u1ed1 t\u1ef1 nhiên khác 0.<\/p>","answer":"<p>Vì 33 chia cho 7 \u0111\u01b0\u1ee3c th\u01b0\u01a1ng là <strong>4<\/strong> và s\u1ed1 d\u01b0 là <strong>5<\/strong> nên<\/p><p><span class=\"math-tex\">$\\dfrac{33}{7}=4+\\dfrac{5}{7}=$<\/span> <span style=\"color:#16a085;\"><span class=\"math-tex\">$4\\dfrac{5}{7}$<\/span><\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><span class=\"math-tex\">$4\\dfrac{5}{7}$<\/span> .<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-26 14:02:38","option_type":"math","len":0},{"id":"6621","post_id":"4571","mon_id":"1158113","chapter_id":"1158119","question":"<p>Ch\u1ecdn phép tính <strong>sai<\/strong><\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$4:\\dfrac{5}{8}=\\dfrac{20}{8}$<\/span>","<strong>B. <\/strong> <span class=\"math-tex\">$\\dfrac{8}{3}:\\dfrac{1}{2}=\\dfrac{16}{3}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{9}{28}:\\dfrac{6}{7}=\\dfrac{3}{8}$<\/span>"],"correct":"1","level":"1","hint":"<p>Mu\u1ed1n chia m\u1ed9t phân s\u1ed1 cho m\u1ed9t phân s\u1ed1 khác 0 ta nhân s\u1ed1 b\u1ecb chia v\u1edbi phân s\u1ed1 ngh\u1ecbch \u0111\u1ea3o c\u1ee7a s\u1ed1 chia:<\/p><p><span class=\"math-tex\">$\\dfrac{a}{b}:\\dfrac{c}{d}=\\dfrac{a}{b}.\\dfrac{d}{c}=\\dfrac{a.d}{b.c}$<\/span><\/p>","answer":"<p><span style=\"color:#16a085;\"><strong>A.<\/strong> <\/span> <span class=\"math-tex\">$4:\\dfrac{5}{8}=\\dfrac{20}{8}$<\/span> (<span style=\"color:#16a085;\">sai<\/span> vì <span class=\"math-tex\">$4:\\dfrac{5}{8}=\\dfrac{4}{1}.\\dfrac{8}{5}=\\dfrac{4.8}{1.5}=\\dfrac{32}{5}$<\/span> )<\/p><p><strong>B. <\/strong> <span class=\"math-tex\">$\\dfrac{8}{3}:\\dfrac{1}{2}=\\dfrac{16}{3}$<\/span> (\u0111úng vì <span class=\"math-tex\">$\\dfrac{8}{3}:\\dfrac{1}{2}=\\dfrac{8}{3}.\\dfrac{2}{1}=\\dfrac{8.2}{3.1}=\\dfrac{16}{3}$<\/span> )<\/p><p><strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{9}{28}:\\dfrac{6}{7}=\\dfrac{3}{8}$<\/span> (\u0111úng vì <span class=\"math-tex\">$\\dfrac{9}{28}:\\dfrac{6}{7}=\\dfrac{9}{28}.\\dfrac{7}{6}=\\dfrac{9.7}{28.6}=\\dfrac{3.3.7}{4.7.3.2}=\\dfrac{3}{4.2}=\\dfrac{3}{8}$<\/span> )<\/p><p>\u0110áp án là <span style=\"color:#16a085;\"><strong>A.<\/strong><\/span> <span style=\"color:#16a085;\"><span class=\"math-tex\">$4:\\dfrac{5}{8}=\\dfrac{20}{8}$<\/span><\/span> <\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-08-26 14:25:30","option_type":"math","len":0}]}