{"common":{"save":0,"post_id":"9123","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5191","post_id":"9123","mon_id":"1159414","chapter_id":"1159500","question":"<p>Lúc 6 gi\u1edd sáng, m\u1ed9t ô tô \u0111i t\u1eeb A \u0111\u1ebfn B v\u1edbi v\u1eadn t\u1ed1c 63 km\/h. Bi\u1ebft A cách B 12,6 km. H\u1ecfi ô tô \u0111\u1ebfn B lúc m\u1ea5y gi\u1edd?<\/p>","options":["<strong>A.<\/strong> 6 gi\u1edd 15 phút.","<strong>B.<\/strong> 7 gi\u1edd 12 phút.","<strong>C.<\/strong> 6 gi\u1edd 12 phút.","<strong>D.<\/strong> 7 gi\u1edd 15 phút."],"correct":"3","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> 6 gi\u1edd 12 phút.<\/span><\/p><p>Th\u1eddi gian ô tô \u0111i t\u1eeb A \u0111\u1ebfn B là 12,6 : 63 = 0,2 (gi\u1edd) = 12 (phút).<\/p><p>Ô tô \u0111\u1ebfn B lúc 6 gi\u1edd + 12 phút = 6 gi\u1edd 12 phút.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-05-01 10:07:51","option_type":"txt","len":2},{"id":"5193","post_id":"9123","mon_id":"1159414","chapter_id":"1159500","question":"<p>T\u1eeb lúc 7 gi\u1edd 50 phút \u0111\u1ebfn 8 gi\u1edd 15 phút, m\u1ed9t xe máy \u0111i t\u1eeb A \u0111\u1ebfn B cách nhau 15 km. Tính v\u1eadn t\u1ed1c c\u1ee7a xe máy theo \u0111\u01a1n v\u1ecb km\/h).<\/p>","options":["<strong>A.<\/strong> 10 km\/h.","<strong>B.<\/strong> 36 km\/h.","<strong>C.<\/strong> 30 km\/h.","<strong>D.<\/strong> 20 km\/h."],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 36 km\/h.<\/span><\/p><p>Th\u1eddi gian xe máy \u0111i t\u1eeb A \u0111\u1ebfn B là:<\/p><p>8 gi\u1edd 15 phút – 7 gi\u1edd 50 phút = 25 (phút) = <span class=\"math-tex\">$\\dfrac{25}{60}$<\/span> (gi\u1edd) = <span class=\"math-tex\">$\\dfrac{5}{12}$<\/span> (gi\u1edd).<\/p><p>V\u1eadn t\u1ed1c c\u1ee7a xe máy là:<\/p><p>15 : <span class=\"math-tex\">$\\dfrac{5}{12}$<\/span> = 15 x <span class=\"math-tex\">$\\dfrac{12}{5}$<\/span> = 36 (km\/h).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-05-01 10:13:39","option_type":"txt","len":1},{"id":"5195","post_id":"9123","mon_id":"1159414","chapter_id":"1159500","question":"<p>M\u1ed9t v\u1eadn \u0111\u1ed9ng viên b\u01a1i t\u1eeb \u0111\u1ea7u b\u1ec3 b\u01a1i \u0111\u1ebfn cu\u1ed1i b\u1ec3 r\u1ed3i quay v\u1ec1 \u0111\u1ea7u b\u1ec3 h\u1ebft 50 giây. Bi\u1ebft b\u1ec3 có chi\u1ec1u dài 50 m. Tính v\u1eadn t\u1ed1c b\u01a1i c\u1ee7a v\u1eadn \u0111\u1ed9ng viên \u0111ó.<\/p>","options":["<strong>A.<\/strong> 1 m\/s.","<strong>B.<\/strong> 1,5 m\/s.","<strong>C.<\/strong> 2 m\/s.","<strong>D.<\/strong> 2,5 m\/s."],"correct":"3","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> 2 m\/s.<\/span><\/p><p>Quãng \u0111\u01b0\u1eddng v\u1eadn \u0111\u1ed9ng viên b\u01a1i t\u1eeb \u0111\u1ea7u b\u1ec3 b\u01a1i \u0111\u1ebfn cu\u1ed1i b\u1ec3 r\u1ed3i quay v\u1ec1 \u0111\u1ea7u b\u1ec3 b\u01a1i là:<\/p><p>50 x 2 = 100 (m).<\/p><p>V\u1eadn t\u1ed1c b\u01a1i c\u1ee7a v\u1eadn \u0111\u1ed9ng viên là:<\/p><p>100 : 50 = 2 (m\/s).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-05-01 10:23:10","option_type":"txt","len":1}]}
