{"common":{"save":0,"post_id":"6929","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"2609","post_id":"6929","mon_id":"1159012","chapter_id":"1159024","question":"<p>M\u1ed9t t&agrave;u v\u0169 tr\u1ee5&nbsp;bay v&ograve;ng quanh m\u1ed9t thi&ecirc;n th\u1ec3 5 v&ograve;ng. N\u1ebfu m\u1ed7i v&ograve;ng t&agrave;u&nbsp;v\u0169 tr\u1ee5 bay \u0111\u01b0\u1ee3c&nbsp;<span class=\"math-tex\">$\\dfrac{78}{10}$<\/span>&nbsp;km th&igrave; n&oacute; \u0111&atilde; bay t\u1ea5t c\u1ea3 bao nhi&ecirc;u ki-l&ocirc;-m&eacute;t quanh thi&ecirc;n th\u1ec3?<\/p>","options":["<strong>A.<\/strong> 78 km","<strong>B.<\/strong> 39 km","<strong>C.<\/strong> 49 km","<strong>D.<\/strong> 108 km"],"correct":"2","level":"3","hint":"","answer":"<p>T&agrave;u v\u0169 tr\u1ee5 \u0111&atilde; bay t\u1ea5t c\u1ea3 s\u1ed1 ki-l&ocirc;-m&eacute;t l&agrave;<\/p><p><span class=\"math-tex\">$5\\mathbf{x}\\dfrac{78}{10}=\\dfrac{5\\mathbf{x}78}{10}=\\dfrac{1\\mathbf{x}78}{2}=\\dfrac{78}{2}=39$<\/span>&nbsp;km.<\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong> 39 km.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-02-11 04:29:02","option_type":"txt","len":0},{"id":"2611","post_id":"6929","mon_id":"1159012","chapter_id":"1159024","question":"<p>So s&aacute;nh&nbsp;<span class=\"math-tex\">$\\dfrac{2}{5}\\mathbf{x}\\dfrac{6}{7}$<\/span>&nbsp;&lt;input class=\"_tit_hoi\" disabled=\"disabled\" type=\"text\"\/&gt;&nbsp;<span class=\"math-tex\">$\\dfrac{2}{7}\\mathbf{x}\\dfrac{6}{5}$<\/span>&nbsp;<\/p>","options":["<strong>&gt;<\/strong>","<strong>&lt;<\/strong>","<strong>=<\/strong>"],"correct":"3","level":"3","hint":"","answer":"<p><span class=\"math-tex\">$\\dfrac{2}{5}\\mathbf{x}\\dfrac{6}{7}$<\/span>&nbsp;<span class=\"math-tex\">$=\\dfrac{2\\mathbf{x}6}{5\\mathbf{x}7}$<\/span>&nbsp;<span class=\"math-tex\">$=\\dfrac{12}{35}$<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{2}{7}\\mathbf{x}\\dfrac{6}{5}$<\/span>&nbsp;<span class=\"math-tex\">$=\\dfrac{2\\mathbf{x}6}{7\\mathbf{x}5}$<\/span>&nbsp;<span class=\"math-tex\">$=\\dfrac{12}{35}$<\/span><\/p><p>Do \u0111&oacute;&nbsp;<span class=\"math-tex\">$\\dfrac{2}{5}\\mathbf{x}\\dfrac{6}{7}$<\/span>&nbsp;<span style=\"color:#16a085;\"><strong>=<\/strong><\/span>&nbsp;&nbsp;<span class=\"math-tex\">$\\dfrac{2}{7}\\mathbf{x}\\dfrac{6}{5}$<\/span>&nbsp;<\/p><p>Ch\u1ecdn ng&ocirc;i sao ghi d\u1ea5u <span style=\"color:#16a085;\"><strong>=<\/strong><\/span>.<\/p>","type":"choose","extra_type":"star","time":"0","user_id":"131","test":"0","date":"2024-02-11 04:34:31","option_type":"txt","len":0},{"id":"2614","post_id":"6929","mon_id":"1159012","chapter_id":"1159024","question":"<p><span class=\"math-tex\">$\\dfrac{4}{25}\\mathbf{x}\\dfrac{3}{17}\\mathbf{x}25$<\/span>&nbsp;=&nbsp;&lt;input class=\"_tit_hoi\" disabled=\"disabled\" type=\"text\"\/&gt;&lt;\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{12}{17}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{25}{12}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{17}{25}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{25}{17}$<\/span>"],"correct":"1","level":"3","hint":"","answer":"<p><span class=\"math-tex\">$\\dfrac{4}{25}\\mathbf{x}\\dfrac{3}{17}\\mathbf{x}25$<\/span>&nbsp;<span class=\"math-tex\">$=\\dfrac{4\\mathbf{x}3\\mathbf{x}25}{25\\mathbf{x}17}=\\dfrac{4\\mathbf{x}3}{17}=\\dfrac{12}{17}$<\/span><\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$\\dfrac{12}{17}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-02-11 04:38:43","option_type":"math","len":0}]}