{"common":{"save":0,"post_id":"8910","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"4841","post_id":"8910","mon_id":"1159414","chapter_id":"1159498","question":"<p>Th\u1eddi gian m\u1ed9t ng\u01b0\u1eddi \u0111i b\u1ed9 h\u1ebft quãng \u0111\u01b0\u1eddng 100 m là 80 giây. Tính v\u1eadn t\u1ed1c \u0111i b\u1ed9 c\u1ee7a ng\u01b0\u1eddi \u0111o và làm tròn \u0111\u1ebfn m\u1ed9t ch\u1eef s\u1ed1 \u1edf ph\u1ea7n th\u1eadp phân.<\/p>","options":["<strong>A.<\/strong> 1,2 m\/s.","<strong>B.<\/strong> 1,3 km\/h.","<strong>C.<\/strong> 1,3 m\/s.","<strong>D.<\/strong> 1,1 km\/h."],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#1abc9c;\"><\/span><span style=\"color:#16a085;\"><strong>C.<\/strong> 1,3 m\/s.<\/span><\/p><p>V\u1eadn t\u1ed1c \u0111i b\u1ed9 c\u1ee7a ng\u01b0\u1eddi \u0111ó là 100 : 80 = 1,25 (m\/s).<\/p><p>Làm tròn 1,25 \u0111\u1ebfn m\u1ed9t ch\u1eef s\u1ed1 \u1edf ph\u1ea7n th\u1eadp phân ta \u0111\u01b0\u1ee3c 1,3 m\/s.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-04-21 08:07:52","option_type":"txt","len":1},{"id":"4843","post_id":"8910","mon_id":"1159414","chapter_id":"1159498","question":"<p>M\u1ed9t xe máy \u0111i t\u1eeb A \u0111\u1ebfn B v\u1edbi v\u1eadn t\u1ed1c 35 km\/h h\u1ebft 0,125 gi\u1edd. Tính quãng \u0111\u01b0\u1eddng t\u1eeb A \u0111\u1ebfn B và làm tròn \u0111\u1ebfn hàng ph\u1ea7n m\u01b0\u1eddi.<\/p>","options":["<strong>A.<\/strong> 4,4 km.","<strong>B.<\/strong> 4,3 km.","<strong>C.<\/strong> 4,2 km.","<strong>D.<\/strong> 4,5 km."],"correct":"1","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 4,4 km.<\/span><\/p><p>Quãng \u0111\u01b0\u1eddng t\u1eeb A \u0111\u1ebfn B dài là 35 x 0,125 = 4,375 (km).<\/p><p>Làm tròn 4,375 \u0111\u1ebfn hàng ph\u1ea7n m\u01b0\u1eddi ta \u0111\u01b0\u1ee3c 4,4 (km).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-04-21 08:13:12","option_type":"txt","len":0},{"id":"4845","post_id":"8910","mon_id":"1159414","chapter_id":"1159498","question":"<p>M\u1ed9t con mèo có th\u1ec3 ch\u1ea1y v\u1edbi t\u1ed1c \u0111\u1ed9 12,5 m\/s. Th\u1eddi gian \u0111\u1ec3 con mèo ch\u1ea1y h\u1ebft quãng \u0111\u01b0\u1eddng dài 126 m kho\u1ea3ng <\/p>","options":["<strong>A.<\/strong> 11 giây.","<strong>B.<\/strong> 9 giây.","<strong>C.<\/strong> 10 giây.","<strong>D.<\/strong> 12 giây."],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> 10 giây.<\/span><\/p><p>Th\u1eddi gian con mèo ch\u1ea1y h\u1ebft quãng \u0111\u01b0\u1eddng dài 126 m là 126 : 12,5 = 10,08 (giây).<\/p><p>V\u1eady th\u1eddi gian \u0111\u1ec3 con mèo ch\u1ea1y h\u1ebft quãng \u0111\u01b0\u1eddng dài 126 m kho\u1ea3ng 10 giây.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-04-21 08:18:12","option_type":"txt","len":2}]}
