{"common":{"save":0,"post_id":"4810","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8301","post_id":"4810","mon_id":"1158113","chapter_id":"1158117","question":"<p>Tính giá tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c <strong>P = 349 + x + 51 +70<\/strong> t\u1ea1i x = 230<\/p>","options":["P = 70","P = 400","P = 700"],"correct":"3","level":"3","hint":"<p>Thay x = 230 vào bi\u1ec3u th\u1ee9c P r\u1ed3i tính.<\/p>","answer":"<p>Giá tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c <strong>P = 349 + x + 51 + 70<\/strong> t\u1ea1i x = 230<\/p><p>P = 349 + 230 + 51 + 70<\/p><p>P = (349 + 51) + (230 + 70)<\/p><p>P = 400 + 300<\/p><p>P = 700<\/p><p>V\u1eady \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>P = 700<\/strong><\/span><\/p>","type":"choose","extra_type":"shape1","time":"0","user_id":"132","test":"1","date":"2021-10-04 13:34:48","option_type":"txt","len":0},{"id":"8303","post_id":"4810","mon_id":"1158113","chapter_id":"1158117","question":"<p>Tìm s\u1ed1 t\u1ef1 nhiên x th\u1ecfa mãn:<\/p><p>273 + 25 - x = 49 + 55 - 12<\/p>","options":["x = 390","x = 260","x = 206"],"correct":"3","level":"3","hint":"<p>S\u1ed1 b\u1ecb tr\u1eeb - S\u1ed1 tr\u1eeb = Hi\u1ec7u<\/p><p>Mu\u1ed1n tìm s\u1ed1 tr\u1eeb ta l\u1ea5y s\u1ed1 b\u1ecb tr\u1eeb tr\u1eeb \u0111i hi\u1ec7u.<\/p>","answer":"<p>273 + 25 - x = 49 + 55 - 12<\/p><p>298 - x = 92<\/p><p> x = 298 - 92<\/p><p> x = 206<\/p><p>V\u1eady \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>x = 206<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"1","date":"2021-10-04 13:38:37","option_type":"txt","len":0},{"id":"8305","post_id":"4810","mon_id":"1158113","chapter_id":"1158117","question":"<p>Tính t\u1ed5ng:<\/p><p>S = 2 . 100 + 2 . 120 + 2 . 140 + ... + 2 . 200<\/p>","options":["S = 180","S = 1800","S = 900"],"correct":"2","level":"3","hint":"<p>S = 2 . 100 + 2 . 120 + 2 . 140 + ... + 2 . 200<\/p><p>S = (100 + 120 + 140 + ... + 200) + (100 + 120 + 140 + ... + 200) (m\u1ed7i s\u1ed1 h\u1ea1ng c\u1ee7a t\u1ed5ng \u0111\u1ec1u l\u1eb7p l\u1ea1i hai l\u1ea7n)<\/p><p>\u0110\u1ec3 ý các c\u1eb7p s\u1ed1 có t\u1ed5ng b\u1eb1ng nhau 100 + 200 = 120 + 180 = 140 + 160<\/p>","answer":"<p>S = 2 . 100 + 2 . 120 + 2 . 140 + ... + 2 . 200<\/p><p> = (100 + 200) + (120 + 180) + (140 + 160) + (... + (200 +100)<\/p><p> = 6 . 300 (có 6 t\u1ed5ng b\u1eb1ng nhau và b\u1eb1ng 300)<\/p><p> = 1800<\/p><p>V\u1eady \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>S = 1800<\/strong><\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"132","test":"1","date":"2021-10-04 13:46:51","option_type":"txt","len":0}]}
