Bài ôn tập chương 1 - Số hữu tỉ

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{"common":{"save":0,"post_id":"5672","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6981","post_id":"5672","mon_id":"1158532","chapter_id":"1158544","question":"B\u1ea3ng sau cho bi\u1ebft \u0111\u1ed9 cao c\u1ee7a 4 rãnh \u0111\u1ea1i d\u01b0\u01a1ng so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n.<\/p><table border=\"1\" cellpadding=\"1\" cellspacing=\"1\" style=\"height: 220px; width: 500px;\"><tbody> <tr> <td>Tên rãnh<\/strong><\/span><\/td> <td>\u0110\u1ed9 cao so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n (km)<\/strong><\/span><\/td> <\/tr> <tr> <td>Rãnh Puerto Rico<\/td> <td>–8,6<\/td> <\/tr> <tr> <td>Rãnh Romanche<\/td> <td>–7,7<\/td> <\/tr> <tr> <td>Rãnh Philippine<\/td> <td>–10,5<\/td> <\/tr> <tr> <td>Rãnh Peru-Chile<\/td> <td>–8,0<\/td> <\/tr><\/tbody><\/table>                               (Ngu\u1ed3n: http:\/\/vi.wikipedia.org\/wiki\/Rãnh \u0111\u1ea1i d\u01b0\u01a1ng)<\/p>Hãy s\u1eafp x\u1ebfp tên các rãnh theo \u0111\u1ed9 cao so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n t\u0103ng d\u1ea7n?<\/p>","options":"","correct":["Philippine","Puerto Rico","Peru-Chile","Romanche"],"level":"2","hint":"Trong hai s\u1ed1 âm, s\u1ed1 nào có s\u1ed1 \u0111\u1ed1i nh\u1ecf h\u01a1n thì s\u1ed1 \u0111ó l\u1edbn h\u01a1n.<\/p>","answer":"So sánh<\/p> –10,5 km < –8,6 km < –8,0 km < –7,7 km<\/p>nên th\u1ee9 t\u1ef1 tên các rãnh theo \u0111\u1ed9 cao so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n t\u0103ng d\u1ea7n là:<\/p>Philippine → Puerto Rico → Peru-Chile → Romanche<\/strong><\/span><\/p>","type":"reorder","extra_type":"sentence","time":"0","user_id":"131","test":"3","date":"2022-04-10 01:45:14","word":["Philippine","Puerto Rico","Peru-Chile","Romanche"]},{"id":"6982","post_id":"5672","mon_id":"1158532","chapter_id":"1158544","question":"Tìm x bi\u1ebft<\/p>$\\dfrac{4}{5}:x = \\dfrac{3}{16}:\\dfrac{5}{4}$<\/span><\/p>","options":["A.<\/strong> $x =\\dfrac{25}{3}$<\/span>","B.<\/strong> $x =\\dfrac{16}{3}$<\/span>","C.<\/strong> $x =\\dfrac{3}{25}$<\/span>","D. <\/strong>$x =\\dfrac{3}{16}$<\/span>"],"correct":"2","level":"2","hint":"","answer":"$\\dfrac{4}{5}:x = \\dfrac{3}{16}:\\dfrac{5}{4}$<\/span><\/p>$\\dfrac{4}{5}:x = \\dfrac{3}{16}.\\dfrac{4}{5}$<\/span><\/p>$\\dfrac{4}{5}:x = \\dfrac{3}{20}$<\/span><\/p>$x =\\dfrac{4}{5}: \\dfrac{3}{20}$<\/span><\/p>$x =\\dfrac{4}{5}. \\dfrac{20}{3}$<\/span><\/p>$x =\\dfrac{16}{3}$<\/span><\/p>\u0110áp án \u0111úng là   B. $x =\\dfrac{16}{3}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-10 01:57:20","option_type":"math","len":0},{"id":"6983","post_id":"5672","mon_id":"1158532","chapter_id":"1158544","question":"Tính di\u1ec7n tích c\u1ee7a m\u1ed9t hình ch\u1eef nh\u1eadt bi\u1ebft chi\u1ec1u r\u1ed9ng là 5,6 cm và chi\u1ec1u dài b\u1eb1ng $\\dfrac{9}{7}$<\/span> chi\u1ec1u r\u1ed9ng.<\/p>","options":["A.<\/strong> 40,32 cm²","B.<\/strong> 40,30 cm²","C.<\/strong> 40,34 cm²","D.<\/strong> 40,31 cm²"],"correct":"1","level":"2","hint":"Di\u1ec7n tích hình ch\u1eef nh\u1eadt b\u1eb1ng chi\u1ec1u dài nhân v\u1edbi chi\u1ec1u r\u1ed9ng.<\/p>","answer":"Chi\u1ec1u dài c\u1ee7a hình ch\u1eef nh\u1eadt là<\/p>$5,6 . \\dfrac{9}{7}=\\dfrac{56}{10}.\\dfrac{9}{7}=\\dfrac{8}{10}.\\dfrac{9}{1}=\\dfrac{72}{10}=7,2$<\/span> (cm)<\/p>Di\u1ec7n tích c\u1ee7a hình ch\u1eef nh\u1eadt là <\/p>5,6 . 7,2 = 40,32 (cm²)<\/p>\u0110áp án \u0111úng là   A.<\/strong> 40,32 cm²<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-04-10 02:08:27","option_type":"txt","len":2}]}