Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"4512","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6214","post_id":"4512","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính<\/p><p><span style=\"color:#2980b9;\"><span class=\"math-tex\">$\\dfrac{2}{3}.\\dfrac{6}{58}.\\dfrac{-29}{4}$<\/span> = ?<\/span><\/p><div class=\"lt123_imgs\"><img class=\"img_dd tiny\" src=\"\/data\/library\/do-vat\/box.png\" \/><span class=\"frac123\"><span class=\"ms\"><\/span><\/span><\/div>","options":["A. <span class=\"math-tex\">$\\dfrac{-1}{2}$<\/span>","B. <span class=\"math-tex\">$\\dfrac{-29}{58}$<\/span>","C. <span class=\"math-tex\">$\\dfrac{1}{2}$<\/span>","D. <span class=\"math-tex\">$\\dfrac{29}{58}$<\/span>"],"correct":"1","level":"1","hint":"<p>Mu\u1ed1n nhân các phân s\u1ed1 v\u1edbi nhau ta nhân t\u1eed v\u1edbi t\u1eed, m\u1eabu v\u1edbi m\u1eabu. Chú ý phân tích t\u1eed và m\u1eabu thành các nhân t\u1eed thích h\u1ee3p \u0111\u1ec3 rút g\u1ecdn.<\/p>","answer":"<p>Ta có: <span class=\"math-tex\">$\\dfrac{2}{3}.\\dfrac{6}{58}.\\dfrac{-29}{4}=\\dfrac{2.6.(-29)}{3.58.4}$<\/span><\/p><p> <span class=\"math-tex\">$=\\dfrac{2.2.3.(-29)}{3.2.29.2.2}$<\/span> (rút g\u1ecdn cho 2.2.3)<\/p><p> <span style=\"color:#16a085;\"><span class=\"math-tex\">$=\\dfrac{-1}{2}$<\/span><\/span><\/p><p>\u0110áp án \u0111úng là<strong><span style=\"color:#16a085;\"> A.<span class=\"math-tex\">$\\dfrac{-1}{2}$<\/span><\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-22 02:07:08","option_type":"math","len":0},{"id":"6217","post_id":"4512","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính<\/p><p><span style=\"color:#2980b9;\"><span class=\"math-tex\">$\\dfrac{-4}{17}:\\dfrac{13}{34}$<\/span> = ?<\/span><\/p>","options":["A. <span class=\"math-tex\">$\\dfrac{-8}{13}$<\/span>","B. <span class=\"math-tex\">$\\dfrac{8}{13}$<\/span>","C. <span class=\"math-tex\">$\\dfrac{-26}{289}$<\/span>","D. <span class=\"math-tex\">$\\dfrac{26}{289}$<\/span>"],"correct":"1","level":"1","hint":"<p>Mu\u1ed1n chia phân s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi phân s\u1ed1 th\u1ee9 hai ta nhân phân s\u1ed1 th\u1ee9 nh\u1ea5t v\u1edbi phân s\u1ed1 ngh\u1ecbch \u0111\u1ea3o c\u1ee7a phân s\u1ed1 th\u1ee9 hai. L\u01b0u ý phân tích t\u1eed và m\u1eabu thành nhân t\u1eed n\u1ebfu có th\u1ec3.<\/p>","answer":"<p>Ta có <span class=\"math-tex\">$\\dfrac{-4}{17}:\\dfrac{13}{34} = \\dfrac{-4}{17}.\\dfrac{34}{13}=\\dfrac{-4.34}{17.13}=\\dfrac{-4.2.17}{17.13}$<\/span> <\/p><p> = <span class=\"math-tex\">$\\dfrac{-4.2}{13}$<\/span> <span style=\"color:#2ecc71;\">= <span style=\"color:#2ecc71;\"><\/span><span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{-8}{13}$<\/span><\/span><span style=\"color:#2ecc71;\"><\/span><\/span><\/p><p>(tách 34 = 2.17, sau \u0111ó rút g\u1ecdn 17 \u1edf t\u1eed và m\u1eabu)<\/p><p>\u0110áp án \u0111úng là <strong><span style=\"color:#16a085;\">A. <span class=\"math-tex\">$\\dfrac{-8}{13}$<\/span><\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-08-22 02:42:03","option_type":"math","len":0},{"id":"6221","post_id":"4512","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tìm x, bi\u1ebft<\/p><p><span style=\"color:#2980b9;\"><span class=\"math-tex\">$x . \\dfrac{5}{6}=\\dfrac{10}{33}$<\/span><\/span><\/p><div class=\"lt123_imgs\"><img class=\"img_dd tiny\" src=\"\/data\/library\/do-an\/4-kem.png\" \/><\/div>","options":["<strong>A<\/strong>. x = <span class=\"math-tex\">$\\dfrac{25}{99}$<\/span>","<strong>B<\/strong>. x = <span class=\"math-tex\">$\\dfrac{4}{11}$<\/span>","<strong>C<\/strong>. x = <span class=\"math-tex\">$\\dfrac{-35}{66}$<\/span>","<strong>D<\/strong>. x = <span class=\"math-tex\">$\\dfrac{25}{22}$<\/span>"],"correct":"2","level":"1","hint":"<p>Mu\u1ed1n tìm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft ta l\u1ea5y tích chia cho th\u1eeba s\u1ed1 \u0111ã bi\u1ebft.<\/p>","answer":"<p><span class=\"math-tex\">$x . \\dfrac{5}{6}=\\dfrac{10}{33}$<\/span><\/p><p><span class=\"math-tex\">$x=\\dfrac{10}{33}: \\dfrac{5}{6}$<\/span><\/p><p><span class=\"math-tex\">$x=\\dfrac{10}{33} . \\dfrac{6}{5}$<\/span><\/p><p><span class=\"math-tex\">$x=\\dfrac{10.6}{33.5}$<\/span><\/p><p><span class=\"math-tex\">$x=\\dfrac{2.5.2.3}{3.11.5}$<\/span><\/p><p><span class=\"math-tex\">$x=\\dfrac{2.2}{11}$<\/span><\/p><p><span style=\"color:#16a085;\"><span class=\"math-tex\">$x=\\dfrac{4}{11}$<\/span><\/span><\/p><p>\u0110áp án \u0111úng là <strong><span style=\"color:#16a085;\">B. <span class=\"math-tex\">$x=\\dfrac{4}{11}$<\/span><\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-22 02:53:04","option_type":"math","len":0}]}