{"common":{"save":0,"post_id":"7642","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"1420","post_id":"7642","mon_id":"1159414","chapter_id":"1159426","question":"<p>\u0110i\u1ec1n s\u1ed1 thích h\u1ee3p vào ch\u1ed7 ch\u1ea5m: 5,5 mm² = ... dm²<\/p>","options":["<strong>A.<\/strong> 0,55","<strong>B.<\/strong> 0,055","<strong>C.<\/strong> 0,005","<strong>D.<\/strong> 0,00055"],"correct":"4","level":"3","hint":"<p>1 dm = 10 cm = 100 mm.<\/p><p>1 dm² = 10 000 mm² nên 1 mm² = <span class=\"math-tex\">$\\dfrac{1}{10000}$<\/span> dm²<\/p>","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> 0,00055<\/span><\/p><p>5,5 mm² = <span class=\"math-tex\">$\\dfrac{5,5}{10000}$<\/span> dm² = 0,00055 dm²<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-15 08:46:56","option_type":"txt","len":0},{"id":"1422","post_id":"7642","mon_id":"1159414","chapter_id":"1159426","question":"<p>Lan, Mai, Hoa \u0111\u1ea1p xe th\u1ec3 d\u1ee5c. Sau m\u1ed9t lúc, Lan \u0111i \u0111\u01b0\u1ee3c quãng \u0111\u01b0\u1eddng 5 km 3 m, Mai \u0111i \u0111\u01b0\u1ee3c quãng \u0111\u01b0\u1eddng 5,3 km, Hoa \u0111i \u0111\u01b0\u1ee3c 5,03 km. B\u1ea1n nào \u0111i \u0111\u01b0\u1ee3c quãng \u0111\u01b0\u1eddng dài nh\u1ea5t?<\/p>","options":["<strong>A.<\/strong> Lan","<strong>B.<\/strong> Mai","<strong>C.<\/strong> Hoa","<strong>D.<\/strong> Mai và Hoa"],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> Mai<\/span><\/p><p>\u0110\u1ed5i \u0111\u01a1n v\u1ecb:<\/p><p><span style=\"color:#2980b9;\">Lan \u0111i quãng \u0111\u01b0\u1eddng: 5 km 3 m = 5003 m<\/span><\/p><p><span style=\"color:#8e44ad;\">Mai \u0111i quãng \u0111\u01b0\u1eddng: 5,3 km = 5300 m<\/span><\/p><p><span style=\"color:#e74c3c;\">Hoa \u0111i quãng \u0111\u01b0\u1eddng: 5,03 km = 5030 m<\/span><\/p><p>Mà <span style=\"color:#2980b9;\">5003<\/span> < <span style=\"color:#e74c3c;\">5030<\/span> < <span style=\"color:#8e44ad;\">5300<\/span> nên Mai \u0111i \u0111\u01b0\u1ee3c quãng \u0111\u01b0\u1eddng dài nh\u1ea5t.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-15 08:51:56","option_type":"txt","len":2},{"id":"1423","post_id":"7642","mon_id":"1159414","chapter_id":"1159426","question":"<p>M\u1ed9t hình vuông có chu vi là 512 cm. Di\u1ec7n tích hình vuông là:<\/p>","options":["<strong>A.<\/strong> 1,6384 m²","<strong>B.<\/strong> 16,384 m²","<strong>C.<\/strong> 163,84 m²","<strong>D.<\/strong> 16384 m²"],"correct":"1","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 1,6384<\/span><\/p><p>\u0110\u1ed9 dài c\u1ea1nh hình vuông \u0111ó là: 512 : 4 = 128 (cm)<\/p><p>Di\u1ec7n tích hình vuông là: 128 x 128 = 16 384 (cm²)<\/p><p>\u0110\u1ed5i \u0111\u01a1n v\u1ecb: 16 384 cm² = 1,6384 m²<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2024-09-15 08:55:01","option_type":"txt","len":2}]}