{"common":{"save":0,"post_id":"7742","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"2077","post_id":"7742","mon_id":"1159414","chapter_id":"1159461","question":"<p>M\u1ed9t s\u1ed1 sau khi làm tròn \u0111\u1ebfn s\u1ed1 t\u1ef1 nhiên g\u1ea7n nh\u1ea5t cho k\u1ebft qu\u1ea3 là 42. S\u1ed1 l\u1edbn nh\u1ea5t có th\u1ec3 là bao nhiêu trong các k\u1ebft qu\u1ea3 sau \u0111ây?<\/p>","options":["<strong>A.<\/strong> 41,499","<strong>B.<\/strong> 42,412","<strong>C.<\/strong> 40,699","<strong>D.<\/strong> 40,299"],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 42,412.<\/span><\/p><p>42,412 có hàng ph\u1ea7n m\u01b0\u1eddi là 4 < 5 nên làm tròn xu\u1ed1ng ta \u0111\u01b0\u1ee3c 42.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-29 03:50:04","option_type":"txt","len":0},{"id":"2078","post_id":"7742","mon_id":"1159414","chapter_id":"1159461","question":"<p>167,4 + 42,8 x 10 – 43,75 : 3,5 … 42,5 x 17 – 28,8 x 4,5<\/p>","options":["<strong>A.<\/strong> >","<strong>B.<\/strong> <","<strong>C.<\/strong> ="],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> <.<\/span><\/p><p>167,4 + 42,8 x 10 – 43,75 : 3,5<br \/>= 167,4 + 428 – 12,5 = 595,4 – 12,5 = 582,9.<\/p><p>42,5 x 17 – 28,8 x 4,5 = 722,5 – 129,6 = 592,9<\/p><p>Vì 582,9 < 592,9 nên<br \/>167,4 + 42,8 x 10 – 43,75 : 3,5 <span style=\"color:#16a085;\"><<\/span> 42,5 x 17 – 28,8 x 4,5.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-29 03:54:51","option_type":"txt","len":0},{"id":"2082","post_id":"7742","mon_id":"1159414","chapter_id":"1159461","question":"<p>M\u1ed9t cây g\u1ed7 dài <span class=\"math-tex\">$\\dfrac{35}{4}$<\/span> m. Bác th\u1ee3 m\u1ed9c c\u01b0a cây g\u1ed7 \u0111ó thành ba khúc. Bi\u1ebft khúc<\/p><p>g\u1ed7 th\u1ee9 nh\u1ea5t dài <span class=\"math-tex\">$\\dfrac{6}{5}$<\/span> m, khúc g\u1ed7 th\u1ee9 hai dài <span class=\"math-tex\">$\\dfrac{7}{5}$<\/span> m. Chi\u1ec1u dài khúc g\u1ed7 còn l\u1ea1i là<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{109}{20}$<\/span> m","<strong>B.<\/strong> <span class=\"math-tex\">$\\dfrac{121}{20}$<\/span> m","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{123}{20 }$<\/span> m","<strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{133}{20 }$<\/span> m"],"correct":"3","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{123}{20 }$<\/span> m.<\/span><\/p><p>T\u1ed5ng chi\u1ec1u dài c\u1ee7a khúc g\u1ed7 th\u1ee9 nh\u1ea5t và th\u1ee9 hai là: <span class=\"math-tex\">$\\dfrac{6}{5}+\\dfrac{7}{5}=\\dfrac{13}{5}$<\/span> (m).<\/p><p>Chi\u1ec1u dài khúc g\u1ed7 còn l\u1ea1i là: <span class=\"math-tex\">$\\dfrac{35}{4}-\\dfrac{13}{5}=\\dfrac{175}{20}-\\dfrac{52}{20}=\\dfrac{123}{20}$<\/span> (m).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-29 04:00:14","option_type":"math","len":0}]}