Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
Bạn hãy xác thực địa chỉ email đăng ký nhé. Chi tiết xem tại đây
Bạn hãy xác thực địa chỉ email đăng ký nhé. Chi tiết xem tại đây
{"common":{"save":0,"post_id":"4470","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6118","post_id":"4470","mon_id":"1158113","chapter_id":"1158119","question":"<p>Lan, Mai, Hoa cùng làm m\u1ed9t công vi\u1ec7c. N\u1ebfu làm riêng, Lan m\u1ea5t 12 gi\u1edd, Mai m\u1ea5t 10 gi\u1edd, Hoa m\u1ea5t 9 gi\u1edd m\u1edbi làm xong công vi\u1ec7c. H\u1ecfi n\u1ebfu ba b\u1ea1n cùng làm thì sau 1 gi\u1edd làm xong bao nhiêu ph\u1ea7n công vi\u1ec7c?<\/p>","options":["<strong>A<\/strong>. <span class=\"math-tex\">$\\dfrac{53}{180}$<\/span> công vi\u1ec7c","<strong>B<\/strong>. <span class=\"math-tex\">$\\dfrac{47}{180}$<\/span> công vi\u1ec7c","<strong>C<\/strong>. <span class=\"math-tex\">$\\dfrac{59}{180}$<\/span> công vi\u1ec7c","<strong>D<\/strong>. <span class=\"math-tex\">$\\dfrac{61}{180}$<\/span> công vi\u1ec7c"],"correct":"1","level":"3","hint":"<p>S\u1ed1 ph\u1ea7n công vi\u1ec7c làm trong 1 gi\u1edd = 1 : s\u1ed1 gi\u1edd làm xong công vi\u1ec7c \u0111ó m\u1ed9t mình.<\/p>","answer":"<p>Vì Lan làm xong công vi\u1ec7c h\u1ebft 12 gi\u1edd nên trong 1 gi\u1edd Lan làm \u0111\u01b0\u1ee3c <span class=\"math-tex\">$\\dfrac{1}{12}$<\/span> ph\u1ea7n công vi\u1ec7c.<\/p><p>Vì Mai làm xong công vi\u1ec7c h\u1ebft 10 gi\u1edd nên trong 1 gi\u1edd Mai làm \u0111\u01b0\u1ee3c <span class=\"math-tex\">$\\dfrac{1}{10}$<\/span> ph\u1ea7n công vi\u1ec7c.<\/p><p>Vì Hoa làm xong công vi\u1ec7c h\u1ebft 9 gi\u1edd nên trong 1 gi\u1edd Hoa làm \u0111\u01b0\u1ee3c <span class=\"math-tex\">$\\dfrac{1}{9}$<\/span> ph\u1ea7n công vi\u1ec7c.<\/p><p>V\u1eady n\u1ebfu ba b\u1ea1n cùng làm thì sau 1 gi\u1edd s\u1ed1 ph\u1ea7n công vi\u1ec7c làm xong là <\/p><p><span class=\"math-tex\">$\\dfrac{1}{12} + \\dfrac{1}{10} + \\dfrac{1}{9}$<\/span> = <span class=\"math-tex\">$\\dfrac{15}{180} + \\dfrac{18}{180} + \\dfrac{20}{180}$<\/span> = <span class=\"math-tex\">$\\dfrac{15+18+20}{180} $<\/span> = <span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{53}{180}$<\/span> (công vi\u1ec7c)<\/span><\/p><p>\u0110áp án \u0111úng là <strong><span style=\"color:#16a085;\">A<\/span><\/strong>.<span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{53}{180}$<\/span> <strong>công vi\u1ec7c<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-08-21 04:06:49","option_type":"math","len":0},{"id":"6171","post_id":"4470","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính chu vi c\u1ee7a m\u1ed9t mi\u1ebfng bìa hình tam giác bi\u1ebft \u0111\u1ed9 dài ba c\u1ea1nh l\u1ea7n l\u01b0\u1ee3t là:<\/p><p><span class=\"math-tex\">$9\\dfrac{6}{7}$<\/span> cm ; <span class=\"math-tex\">$10\\dfrac{2}{3}$<\/span> cm ; <span class=\"math-tex\">$12\\dfrac{10}{21}$<\/span> cm<\/p>","options":["<strong>A<\/strong>. 32 cm","<strong>B<\/strong>. 33 cm","<strong>C<\/strong>. 34 cm","<strong>D<\/strong>. 35 cm"],"correct":"2","level":"3","hint":"<p>Chu vi tam giác b\u1eb1ng t\u1ed5ng \u0111\u1ed9 dài ba c\u1ea1nh.<\/p>","answer":"<p>Chu vi mi\u1ebfng bìa là:<\/p><p> <span class=\"math-tex\">$9\\dfrac{6}{7}$<\/span> + <span class=\"math-tex\">$10\\dfrac{2}{3}$<\/span> + <span class=\"math-tex\">$12\\dfrac{10}{21}$<\/span> <\/p><p>= <span class=\"math-tex\">$9+\\dfrac{6}{7} + 10 +\\dfrac{2}{3} + 12+\\dfrac{10}{21}$<\/span><\/p><p>= <span class=\"math-tex\">$9+10+12+\\dfrac{6}{7}+\\dfrac{2}{3}+\\dfrac{10}{21}$<\/span><\/p><p>= <span class=\"math-tex\">$31 + \\dfrac{18}{21} + \\dfrac{14}{21} + \\dfrac{10}{21}$<\/span> <\/p><p>= <span class=\"math-tex\">$31+\\dfrac{18+14+10}{21}$<\/span><\/p><p>= <span class=\"math-tex\">$31 + \\dfrac{42}{21}$<\/span><\/p><p>= <span class=\"math-tex\">$31+2$<\/span> = <strong><span style=\"color:#16a085;\">33 cm<\/span><\/strong><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B<\/strong><\/span>.<strong><span style=\"color:#16a085;\">33 cm<\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-08-21 12:21:26","option_type":"txt","len":0},{"id":"6177","post_id":"4470","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính b\u1eb1ng cách h\u1ee3p lí<\/p><p><strong>Q<\/strong> = <span class=\"math-tex\">$-\\dfrac{8}{9}+\\dfrac{17}{6}+\\dfrac{23}{9}-\\dfrac{25}{6}-5$<\/span><\/p>","options":["<strong>A<\/strong>. Q = <span class=\"math-tex\">$\\dfrac{-14}{3}$<\/span>","<strong>B <\/strong>.Q = <span class=\"math-tex\">$\\dfrac{-11}{3}$<\/span>","<strong>C<\/strong>. Q = <span class=\"math-tex\">$\\dfrac{-17}{3}$<\/span>","<strong>D<\/strong>. Q = <span class=\"math-tex\">$\\dfrac{-19}{3}$<\/span>"],"correct":"1","level":"3","hint":"<p>Nhóm các phân s\u1ed1 có cùng m\u1eabu l\u1ea1i v\u1edbi nhau r\u1ed3i th\u1ef1c hi\u1ec7n phép tính.<\/p>","answer":"<p>Nhóm các phân s\u1ed1 có cùng m\u1eabu l\u1ea1i v\u1edbi nhau, r\u1ed3i th\u1ef1c hi\u1ec7n phép tính.<\/p><p>Q = <span class=\"math-tex\">$-\\dfrac{8}{9}+\\dfrac{17}{6}+\\dfrac{23}{9}-\\dfrac{25}{6}-5$<\/span><\/p><p>Q = <span class=\"math-tex\">$\\dfrac{-8}{9}+\\dfrac{23}{9}+\\dfrac{17}{6}-\\dfrac{25}{6}-5$<\/span><\/p><p>Q = <span class=\"math-tex\">$\\dfrac{-8+23}{9}+\\dfrac{17-25}{6}-5$<\/span><\/p><p>Q = <span class=\"math-tex\">$\\dfrac{15}{9}+\\dfrac{-8}{6}-5$<\/span><\/p><p>Q = <span class=\"math-tex\">$\\dfrac{5}{3}+\\dfrac{-4}{3}-5$<\/span><\/p><p>Q = <span class=\"math-tex\">$\\dfrac{5}{3}+\\dfrac{-4}{3}-\\dfrac{15}{3}$<\/span><\/p><p>Q = <span class=\"math-tex\">$\\dfrac{5-4-15}{3}$<\/span><\/p><p><strong><span style=\"color:#16a085;\">Q = <span class=\"math-tex\">$\\dfrac{-14}{3}$<\/span><\/span><\/strong><\/p><p>\u0110áp án \u0111úng là <strong><span style=\"color:#16a085;\">A<\/span><\/strong>.<strong><span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{-14}{3}$<\/span><\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-08-21 12:58:34","option_type":"math","len":0}]}