{"common":{"save":0,"post_id":"8397","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"4424","post_id":"8397","mon_id":"1159414","chapter_id":"1159497","question":"<p>Di\u1ec7n tích xung quanh c\u1ee7a hình l\u1eadp ph\u01b0\u01a1ng có \u0111\u1ed9 dài c\u1ea1nh 0,9 m là<\/p>","options":["<strong>A.<\/strong> 3,24 dm²","<strong>B.<\/strong> 324 m²","<strong>C.<\/strong> 324 dm²","<strong>D.<\/strong> 32,4 m²"],"correct":"3","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> 324 dm²<\/span><\/p><p>Di\u1ec7n tích m\u1ed9t m\u1eb7t c\u1ee7a hình l\u1eadp ph\u01b0\u01a1ng là: 0,9 x 0,9 = 0,81 (m²).<\/p><p>Di\u1ec7n tích xung quanh c\u1ee7a hình l\u1eadp ph\u01b0\u01a1ng là: 0,81 x 4 = 3,24 (m²).<\/p><p>\u0110\u1ed5i: 3,24 m² = 324 dm².<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-02-02 10:10:29","option_type":"txt","len":2},{"id":"4426","post_id":"8397","mon_id":"1159414","chapter_id":"1159497","question":"<p>Di\u1ec7n tích toàn ph\u1ea7n c\u1ee7a hình l\u1eadp ph\u01b0\u01a1ng có \u0111\u1ed9 dài c\u1ea1nh là 60 mm b\u1eb1ng<\/p>","options":["<strong>A.<\/strong> 216 dm²","<strong>B.<\/strong> 216 cm²","<strong>C.<\/strong> 2160 mm²","<strong>D.<\/strong> 21 600 m²"],"correct":"2","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 216 cm²<\/span><\/p><p>Di\u1ec7n tích m\u1ed9t m\u1eb7t c\u1ee7a hình l\u1eadp ph\u01b0\u01a1ng là: 60 x 60 = 3600 (mm²).<\/p><p>Di\u1ec7n tích xung quanh c\u1ee7a hình l\u1eadp ph\u01b0\u01a1ng là: 3600 x 6 = 21 600 (mm²).<\/p><p>\u0110\u1ed5i: 21 600 mm² = <span style=\"color:#16a085;\"><strong>216 cm²<\/strong><\/span> = 2,16 dm² = 0,0216 m².<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-02-02 10:15:48","option_type":"txt","len":2},{"id":"4428","post_id":"8397","mon_id":"1159414","chapter_id":"1159497","question":"<p>Ch\u1ecdn câu <strong>\u0111úng<\/strong>. Hình l\u1eadp ph\u01b0\u01a1ng có \u0111\u1ed9 dài c\u1ea1nh là 11 dm thì có<\/p>","options":["<strong>A.<\/strong> di\u1ec7n tích m\u1ed9t m\u1eb7t là 120 dm².","<strong>B.<\/strong> di\u1ec7n tích toàn ph\u1ea7n là 726 m².","<strong>C.<\/strong> di\u1ec7n tích m\u1ed9t m\u1eb7t là 121 cm².","<strong>D.<\/strong> di\u1ec7n tích xung quanh là 484 dm²."],"correct":"4","level":"2","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> di\u1ec7n tích xung quanh là 484 dm².<\/span><\/p><p>Hình l\u1eadp ph\u01b0\u01a1ng có \u0111\u1ed9 dài c\u1ea1nh là 11 dm thì có<\/p><p>♦ di\u1ec7n tích m\u1ed9t m\u1eb7t là: 11 x 11 = 121 (dm²). (A, C sai)<\/p><p>♦ di\u1ec7n tích xung quanh là: 121 x 4 = 484 (dm²). (D \u0111úng)<\/p><p>♦ di\u1ec7n tích toàn ph\u1ea7n là: 121 x 6 = 726 (dm²). (B sai)<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"0","date":"2025-02-02 10:21:02","option_type":"txt","len":3}]}
