Ôn tập chương 6 Phân số - Bài tập nâng cao số 1

Home Lớp 6 Toán lớp 6 - Sách kết nối tri thức Ôn tập chương 6Bài tập nâng cao

{"common":{"save":0,"post_id":"4574","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6699","post_id":"4574","mon_id":"1158113","chapter_id":"1158119","question":"M\u1ed9t l\u1edbp h\u1ecdc có s\u1ed1 h\u1ecdc sinh nam b\u1eb1ng 4<\/span>3<\/span><\/span>   s\u1ed1 h\u1ecdc sinh n\u1eef. H\u1ecfi s\u1ed1 h\u1ecdc sinh nam b\u1eb1ng bao nhiêu ph\u1ea7n s\u1ed1 h\u1ecdc sinh c\u1ea3 l\u1edbp?<\/p>","options":["$\\dfrac{4}{7}$<\/span>","$\\dfrac{3}{7}$<\/span>","$\\dfrac{3}{4}$<\/span>"],"correct":"1","level":"3","hint":"","answer":"S\u1ed1 h\u1ecdc sinh nam b\u1eb1ng  $\\dfrac{4}{3}$<\/span> s\u1ed1 h\u1ecdc sinh n\u1eef ngh\u0129a là s\u1ed1 h\u1ecdc sinh nam chi\u1ebfm 4 ph\u1ea7n, s\u1ed1 h\u1ecdc sinh n\u1eef chi\u1ebfm 3 ph\u1ea7n. Do \u0111ó s\u1ed1 h\u1ecdc sinh c\u1ea3 l\u1edbp có t\u1ed5ng c\u1ed9ng là 7 ph\u1ea7n. Suy ra s\u1ed1 h\u1ecdc sinh nam chi\u1ebfm <\/p>4 : 7 = $\\dfrac{4}{7}$<\/span><\/span>  (s\u1ed1 h\u1ecdc sinh c\u1ea3 l\u1edbp)<\/p>\u0110áp án \u0111úng là  $\\dfrac{4}{7}$<\/span><\/span> .<\/p>","type":"choose","extra_type":"cloud","time":"0","user_id":"131","test":"1","date":"2021-08-27 10:38:51","option_type":"math","len":0},{"id":"6701","post_id":"4574","mon_id":"1158113","chapter_id":"1158119","question":"M\u1ed9t ng\u01b0\u1eddi nông dân tr\u1ed3ng hoa lan và hoa h\u1ed3ng trong v\u01b0\u1eddn. di\u1ec7n tích tr\u1ed3ng hoa lan b\u1eb1ng 3<\/span>14<\/span><\/span>   di\u1ec7n tích v\u01b0\u1eddn, ph\u1ea7n tr\u1ed3ng hoa h\u1ed3ng b\u1eb1ng  17<\/span>28<\/span><\/span>   di\u1ec7n tích v\u01b0\u1eddn. H\u1ecfi ph\u1ea7n \u0111\u1ea5t còn l\u1ea1i b\u1eb1ng bao nhiêu ph\u1ea7n di\u1ec7n tích v\u01b0\u1eddn?<\/p>","options":["$\\dfrac{5}{28}$<\/span> di\u1ec7n tích v\u01b0\u1eddn","$\\dfrac{3}{28}$<\/span> di\u1ec7n tích v\u01b0\u1eddn","$\\dfrac{9}{28}$<\/span> di\u1ec7n tích v\u01b0\u1eddn"],"correct":"1","level":"3","hint":"","answer":"Ph\u1ea7n \u0111\u1ea5t còn l\u1ea1i chi\u1ebfm s\u1ed1 ph\u1ea7n di\u1ec7n tích v\u01b0\u1eddn là<\/p>$1- \\dfrac{3}{14}-\\dfrac{17}{28}$<\/span> = $\\dfrac{28}{28}-\\dfrac{6}{28}-\\dfrac{17}{28}$<\/span> = $\\dfrac{28-6-17}{28}$<\/span> = $\\dfrac{5}{28}$<\/span> (di\u1ec7n tích v\u01b0\u1eddn)<\/span><\/p>\u0110áp án \u0111úng là    $\\dfrac{5}{28}$<\/span> (di\u1ec7n tích v\u01b0\u1eddn)<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-27 10:46:18","option_type":"math","len":0},{"id":"6703","post_id":"4574","mon_id":"1158113","chapter_id":"1158119","question":"Ba ng\u01b0\u1eddi A, B, C cùng làm m\u1ed9t công vi\u1ec7c. N\u1ebfu làm riêng, ng\u01b0\u1eddi A c\u1ea7n 12 gi\u1edd, ng\u01b0\u1eddi B c\u1ea7n 15 gi\u1edd, ng\u01b0\u1eddi C c\u1ea7n 9 gi\u1edd \u0111\u1ec3 hoàn thành công vi\u1ec7c. H\u1ecfi n\u1ebfu 3 ng\u01b0\u1eddi cùng làm chung công vi\u1ec7c thì c\u1ea7n bao lâu \u0111\u1ec3 hoàn thành công vi\u1ec7c \u0111ó?<\/p>","options":["$\\dfrac{170}{47}$<\/span> gi\u1edd","$\\dfrac{180}{47}$<\/span> gi\u1edd","$\\dfrac{160}{47}$<\/span> gi\u1edd"],"correct":"2","level":"3","hint":"Tính s\u1ed1 ph\u1ea7n công vi\u1ec7c mà m\u1ed7i ng\u01b0\u1eddi làm \u0111\u01b0\u1ee3c trong 1 gi\u1edd.<\/p>","answer":"Trong 1 gi\u1edd ng\u01b0\u1eddi A làm \u0111\u01b0\u1ee3c  $\\dfrac{1}{12}$<\/span> (công vi\u1ec7c).<\/p>Trong 1 gi\u1edd ng\u01b0\u1eddi B làm \u0111\u01b0\u1ee3c  $\\dfrac{1}{15}$<\/span> (công vi\u1ec7c).<\/p>Trong 1 gi\u1edd ng\u01b0\u1eddi C làm \u0111\u01b0\u1ee3c  $\\dfrac{1}{9}$<\/span>  (công vi\u1ec7c).<\/p>Suy ra trong 1 gi\u1edd c\u1ea3 ba ng\u01b0\u1eddi cùng làm \u0111\u01b0\u1ee3c <\/p> $\\dfrac{1}{12}+\\dfrac{1}{15}+\\dfrac{1}{9}$<\/span> = $\\dfrac{15}{180}+\\dfrac{12}{180}+\\dfrac{20}{180}$<\/span> = $\\dfrac{15+12+20}{180}$<\/span> = $\\dfrac{47}{180}$<\/span> (công vi\u1ec7c)<\/p>V\u1eady n\u1ebfu ba ng\u01b0\u1eddi làm chung thì \u0111\u1ec3 làm xong công vi\u1ec7c c\u1ea7n s\u1ed1 gi\u1edd là<\/p>$1:\\dfrac{47}{180}=1.\\dfrac{180}{47}$<\/span> = $\\dfrac{180}{47}$<\/span><\/span> (gi\u1edd)<\/span><\/p>\u0110áp án \u0111úng là   $\\dfrac{180}{47}$<\/span><\/span>  (gi\u1edd)<\/span><\/strong><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-27 10:57:34","option_type":"math","len":0}]}