Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"6923","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"2599","post_id":"6923","mon_id":"1159012","chapter_id":"1159024","question":"<p>Ng\u01b0\u1eddi ta c\u1eaft m\u1ed9t thanh s\u1eaft dài <span class=\"math-tex\">$\\dfrac{5}{2}$<\/span> m thành các \u0111o\u1ea1n dài b\u1eb1ng nhau, m\u1ed7i \u0111o\u1ea1n dài <span class=\"math-tex\">$\\dfrac{1}{4}$<\/span>m. H\u1ecfi ng\u01b0\u1eddi ta c\u1eaft \u0111\u01b0\u1ee3c bao nhiêu \u0111o\u1ea1n nh\u01b0 v\u1eady?<\/p>","options":["<strong>A.<\/strong> 8","<strong>B.<\/strong> 20","<strong>C.<\/strong> 10","<strong>D.<\/strong> 12"],"correct":"3","level":"3","hint":"","answer":"<p>Ng\u01b0\u1eddi ta c\u1eaft \u0111\u01b0\u1ee3c s\u1ed1 \u0111o\u1ea1n là:<\/p><p><span class=\"math-tex\">$\\dfrac{5}{2}:\\dfrac{1}{4}$<\/span> = <span class=\"math-tex\">$\\dfrac{5}{2}\\times\\dfrac{4}{1}$<\/span> = <span class=\"math-tex\">$\\dfrac{5\\times4}{2\\times1}$<\/span> = <span class=\"math-tex\">$\\dfrac{20}{2}$<\/span> = 10 (\u0111o\u1ea1n)<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> 10<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-02-11 04:06:25","option_type":"txt","len":0},{"id":"2618","post_id":"6923","mon_id":"1159012","chapter_id":"1159024","question":"<p>M\u1ed9t khu v\u01b0\u1eddn có chi\u1ec1u r\u1ed9ng là <span class=\"math-tex\">$\\dfrac{11}{4}$<\/span> m và chu vi là <span class=\"math-tex\">$\\dfrac{25}{2}$<\/span> m. Tìm chi\u1ec1u dài c\u1ee7a khu v\u01b0\u1eddn.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{15}{2}$<\/span> m","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{7}{2}$<\/span> m","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{7}{2}$<\/span> dm","<strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{7}{4}$<\/span> m"],"correct":"2","level":"3","hint":"<p>Tìm n\u1eeda chu vi khu v\u01b0\u1eddn, sau \u0111ó l\u1ea5y n\u1eeda chu vi tr\u1eeb \u0111i chi\u1ec1u r\u1ed9ng thì tìm \u0111\u01b0\u1ee3c chi\u1ec1u dài.<\/p>","answer":"<p>N\u1eeda chu vi khu v\u01b0\u1eddn là: <\/p><p><span class=\"math-tex\">$\\dfrac{25}{2}:2=\\dfrac{25}{2} \\times \\dfrac{1}{2}=\\dfrac{25}{4}$<\/span> (m)<\/p><p>Chi\u1ec1u dài c\u1ee7a khu v\u01b0\u1eddn là:<\/p><p><span class=\"math-tex\">$\\dfrac{25}{4}-\\dfrac{11}{4}=\\dfrac{14}{4}=\\dfrac{7}{2}$<\/span> (m)<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{7}{2}$<\/span> m<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-02-11 04:53:18","option_type":"math","len":0},{"id":"2620","post_id":"6923","mon_id":"1159012","chapter_id":"1159024","question":"<p>Ng\u01b0\u1eddi ta c\u1eaft m\u1ed9t thanh s\u1eaft dài <span class=\"math-tex\">$\\dfrac{9}{2}$<\/span> m thành 15 \u0111o\u1ea1n b\u1eb1ng nhau. H\u1ecfi m\u1ed7i \u0111o\u1ea1n dài bao nhiêu mét?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{3}{11}$<\/span> m","<strong>B.<\/strong><span class=\"math-tex\">$\\dfrac{9}{10}$<\/span> m","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{10}{3}$<\/span> m","<strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{3}{10}$<\/span> m"],"correct":"4","level":"3","hint":"","answer":"<p>M\u1ed7i \u0111o\u1ea1n dài s\u1ed1 mét là:<\/p><p><span class=\"math-tex\">$\\dfrac{9}{2}:15=\\dfrac{9}{2}\\times \\dfrac{1}{15}=\\dfrac{9}{30}=\\dfrac{3}{10}$<\/span> (m)<\/p><p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{3}{10}$<\/span> m<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-02-11 04:54:25","option_type":"math","len":0}]}