{"common":{"save":0,"post_id":"8905","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"4790","post_id":"8905","mon_id":"1159414","chapter_id":"1159498","question":"<p>Lúc 6 gi\u1edd 30 phút, cô Mai \u0111i xe máy t\u1eeb nhà và \u0111\u1ebfn ch\u1ee3 lúc 6 gi\u1edd 50 phút. Bi\u1ebft quãng \u0111\u01b0\u1eddng t\u1eeb nhà cô Mai \u0111\u1ebfn ch\u1ee3 dài 10 km. Tính v\u1eadn t\u1ed1c c\u1ee7a cô Mai (theo \u0111\u01a1n v\u1ecb km\/h).<\/p>","options":["<strong>A.<\/strong> 30 km\/h.","<strong>B.<\/strong> 20 km\/h.","<strong>C.<\/strong> 40 km\/h.","<strong>D.<\/strong> 10 km\/h."],"correct":"1","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 30 km\/h.<\/span><\/p><p>Th\u1eddi gian cô Mai \u0111i xe máy t\u1eeb nhà \u0111\u1ebfn ch\u1ee3 là<\/p><p>6 gi\u1edd 50 phút – 6 gi\u1edd 30 phút = 20 phút = <span class=\"math-tex\">$\\dfrac{1}{3}$<\/span> gi\u1edd.<\/p><p>V\u1eadn t\u1ed1c c\u1ee7a cô Mai \u0111i xe máy là 10 : <span class=\"math-tex\">$\\dfrac{1}{3}$<\/span> = 10 x <span class=\"math-tex\">$\\dfrac{3}{1}$<\/span> = 30 (km\/h).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-04-17 09:18:09","option_type":"txt","len":1},{"id":"4792","post_id":"8905","mon_id":"1159414","chapter_id":"1159498","question":"<p>\u0110\u1ed5i 18 km\/h = <input class=\"_tit_hoi\" disabled=\"disabled\" type=\"text\"\/> m\/s<\/p>","options":["<strong>A.<\/strong> 6 m\/s.","<strong>B.<\/strong> 10 m\/s.","<strong>C.<\/strong> 4 m\/s.","<strong>D.<\/strong> 5 m\/s."],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> 5 m\/s.<\/span><\/p><p>18 km\/h = (18 000 : 3600) m\/s = 5 m\/s.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-04-17 09:20:14","option_type":"txt","len":0},{"id":"4794","post_id":"8905","mon_id":"1159414","chapter_id":"1159498","question":"<p>Trong 12 phút, m\u1ed9t xe máy \u0111i \u0111\u01b0\u1ee3c 7200 m. Tính v\u1eadn t\u1ed1c c\u1ee7a xe máy (theo \u0111\u01a1n v\u1ecb km\/h).<\/p>","options":["<strong>A.<\/strong> 36 m\/s.","<strong>B.<\/strong> 36 km\/h.","<strong>C.<\/strong> 10 km\/h.","<strong>D.<\/strong> 10 m\/s."],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 36 km\/h.<\/span><\/p><p>\u0110\u1ed5i: 7200 m = 7,2 km;<\/p><p>12 phút = <span class=\"math-tex\">$\\dfrac{1}{5}$<\/span> gi\u1edd = 0,2 gi\u1edd.<\/p><p>V\u1eadn t\u1ed1c c\u1ee7a xe máy là 7,2 : 0,2 = 36 (km\/h). <\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"131","test":"0","date":"2025-04-17 09:24:20","option_type":"txt","len":0}]}
