{"common":{"save":0,"post_id":"8438","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"4706","post_id":"8438","mon_id":"1159414","chapter_id":"1159497","question":"<p>M\u1ed9t kh\u1ed1i kim lo\u1ea1i hình l\u1eadp ph\u01b0\u01a1ng có c\u1ea1nh 2 cm. Bi\u1ebft m\u1ed7i x\u0103ng-ti-mét kh\u1ed1i c\u1ee7a kh\u1ed1i kim lo\u1ea1i cân n\u1eb7ng 7,8 g. H\u1ecfi kh\u1ed1i kim lo\u1ea1i \u0111ó cân n\u1eb7ng bao nhiêu gam?<\/p>","options":["<strong>A.<\/strong> 62,4 g","<strong>B.<\/strong> 64,4 g","<strong>C.<\/strong> 64,2 g","<strong>D.<\/strong> 64,4 g"],"correct":"1","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> 62,4 g.<\/span><\/p><p>Th\u1ec3 tích c\u1ee7a kh\u1ed1i kim lo\u1ea1i là 2 x 2 x 2 = 8 (cm³).<\/p><p>Kh\u1ed1i kim lo\u1ea1i n\u1eb7ng s\u1ed1 gam là 8 x 7,8 = 62,4 (g).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-02-16 13:17:02","option_type":"txt","len":0},{"id":"4707","post_id":"8438","mon_id":"1159414","chapter_id":"1159497","question":"<p>M\u1ed9t kh\u1ed1i kim lo\u1ea1i hình h\u1ed9p ch\u1eef nh\u1eadt có chi\u1ec1u dài 5 cm, chi\u1ec1u r\u1ed9ng 2 cm và chiêu cao 1 cm. Bi\u1ebft c\u1ee9 1 x\u0103ng-ti-mét kh\u1ed1i c\u1ee7a kim lo\u1ea1i \u0111ó n\u1eb7ng 8,9 g. H\u1ecfi kh\u1ed1i kim lo\u1ea1i cân n\u1eb7ng bao nhiêu gam?<\/p>","options":["<strong>A.<\/strong> 8,9 g","<strong>B.<\/strong> 89 g","<strong>C.<\/strong> 90 g","<strong>D.<\/strong> 9 g"],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 89 g.<\/span><\/p><p>Th\u1ec3 tích c\u1ee7a kh\u1ed1i kim lo\u1ea1i là 5 x 2 x 1 = 10 (cm³).<\/p><p>Kh\u1ed1i kim lo\u1ea1i n\u1eb7ng s\u1ed1 gam là 10 x 8,9 = 89 (g).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-02-16 13:19:58","option_type":"txt","len":0},{"id":"4709","post_id":"8438","mon_id":"1159414","chapter_id":"1159497","question":"<p>M\u1ed9t kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng có di\u1ec7n tích xung quanh là 100 cm². Tính th\u1ec3 tích c\u1ee7a kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng \u0111ó.<\/p>","options":["<strong>A.<\/strong> 125 m³","<strong>B.<\/strong> 125 dm³","<strong>C.<\/strong> 125 mm³","<strong>D.<\/strong> 125 cm³"],"correct":"4","level":"3","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> 125 cm³.<\/span><\/p><p>Di\u1ec7n tích m\u1ed9t m\u1eb7t c\u1ee7a kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng là 100 : 4 = 25 (cm²).<\/p><p>Vì 5 x 5 = 25 nên kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng có c\u1ea1nh là 5 cm.<\/p><p>Th\u1ec3 tích c\u1ee7a kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng là 5 x 5 x 5 = 125 (cm³).<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-02-16 13:23:36","option_type":"txt","len":1}]}
