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HomeToán lớp 6 (Sách KNTT)Toán lớp 6 Tập 2Bài 23: Mở rộng phân số. Phân số bằng nhauBài tập nâng cao
{"common":{"save":0,"post_id":"4436","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5903","post_id":"4436","mon_id":"1158113","chapter_id":"1158119","question":"<p>M\u1ed9t vòi n\u01b0\u1edbc ch\u1ea3y vào m\u1ed9t b\u1ec3 không có n\u01b0\u1edbc, sau 1 gi\u1edd thì \u0111\u1ea7y b\u1ec3. H\u1ecfi sau 12 phút thì l\u01b0\u1ee3ng n\u01b0\u1edbc \u0111ã ch\u1ea3y chi\u1ebfm bao nhiêu ph\u1ea7n c\u1ee7a b\u1ec3?<\/p><p><img class=\"img_dd small\" src=\"\/data\/library\/con-vat\/duck.png\" \/><\/p>","options":["<span class=\"frac123\"><span class=\"ts\">1<\/span><span class=\"ms\">5<\/span><\/span>"," <span class=\"frac123\"><span class=\"ts\">12<\/span><span class=\"ms\">60<\/span><\/span><span class=\"frac123\"><span class=\"ms\"><\/span><\/span>"],"correct":"1","level":"3","hint":"<p>1 gi\u1edd = 60 phút<\/p><p>Rút g\u1ecdn phân s\u1ed1 v\u1ec1 t\u1ed1i gi\u1ea3n.<\/p>","answer":"<p>1 gi\u1edd = 60 phút<\/p><p>Vì vòi ch\u1ea3y 60 phút thì \u0111\u1ea7y b\u1ec3 nên n\u1ebfu cho vòi ch\u1ea3y 12 phút thì l\u01b0\u1ee3ng n\u01b0\u1edbc \u0111ã ch\u1ea3y chi\u1ebfm s\u1ed1 ph\u1ea7n c\u1ee7a b\u1ec3 là:<\/p><p><span class=\"math-tex\">$\\dfrac{12}{60}=\\dfrac{12:12}{60:12}=\\dfrac{1}{5}$<\/span><\/p><p>\u0110áp án là <span class=\"frac123\"><span class=\"ts\"><strong><span style=\"color:#2ecc71;\">1<\/span><\/strong><\/span><strong><span style=\"color:#2ecc71;\"><span class=\"ms\">5<\/span><\/span><\/strong><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"3","date":"2021-08-18 12:14:38","option_type":"math","len":0},{"id":"5906","post_id":"4436","mon_id":"1158113","chapter_id":"1158119","question":"<p>M\u1eb9 cho Na 90 000 \u0111\u1ed3ng \u0111\u1ec3 mua bút. Na \u0111ã mua bút h\u1ebft 54 000 \u0111\u1ed3ng. H\u1ecfi Na \u0111ã dùng h\u1ebft bao nhiêu ph\u1ea7n s\u1ed1 ti\u1ec1n m\u1eb9 cho?<\/p><div class=\"lt123_imgs\"><img class=\"img_dd small\" src=\"\/data\/library\/gia-dinh\/me-con.png\" \/><\/div><p>Na \u0111ã dùng h\u1ebft <span class=\"frac123\"><span class=\"ts\"><input class=\"tim_x input_number\" type=\"text\" \/><\/span><span class=\"ms\"><input class=\"tim_x input_number\" type=\"text\" \/><\/span><\/span> s\u1ed1 ti\u1ec1n m\u1eb9 cho.<\/p><div class=\"lt123_imgs\"> <\/div><div class=\"lt123_imgs\"> <\/div>","options":"","correct":["[\"3\",\"5\"]"],"level":"3","hint":"<p>L\u1eadp t\u1ec9 s\u1ed1 gi\u1eefa s\u1ed1 ti\u1ec1n Na \u0111ã dùng v\u1edbi s\u1ed1 ti\u1ec1n m\u1eb9 cho. \u0110\u01b0a phân s\u1ed1 v\u1ec1 t\u1ed1i gi\u1ea3n.<\/p>","answer":"<p>L\u1eadp t\u1ec9 s\u1ed1 gi\u1eefa s\u1ed1 ti\u1ec1n Na \u0111ã dùng v\u1edbi s\u1ed1 ti\u1ec1n m\u1eb9 cho. \u0110\u01b0a phân s\u1ed1 v\u1ec1 t\u1ed1i gi\u1ea3n.<\/p><p>S\u1ed1 ph\u1ea7n s\u1ed1 ti\u1ec1n Na \u0111ã dùng h\u1ebft là <\/p><p><span class=\"math-tex\">$\\dfrac{54000}{90000}=\\dfrac{54000:18000}{90000:18000}=$<\/span> <span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{3}{5}$<\/span><\/span> .<\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là <strong><span class=\"frac123\"><span class=\"ts\"><span style=\"color:#16a085;\">3<\/span><\/span><span style=\"color:#16a085;\"><span class=\"ms\">5<\/span><\/span><\/span><\/strong><\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2021-08-18 12:26:31"},{"id":"5909","post_id":"4436","mon_id":"1158113","chapter_id":"1158119","question":"<p>Rút g\u1ecdn phân s\u1ed1<\/p><p> <span class=\"math-tex\">$\\dfrac{3^{5}.7^{6}}{2.3^{7}.7^{5}}$<\/span> .<\/p><div class=\"lt123_imgs\"><img class=\"img_dd tiny\" src=\"\/data\/library\/hoa-cay\/cay2.png\" \/><\/div>","options":["<strong>A<\/strong>. <span class=\"math-tex\">$\\dfrac{3}{2}$<\/span>","<strong>B<\/strong>. <span class=\"math-tex\">$\\dfrac{7}{9}$<\/span>","<strong>C<\/strong>. <span class=\"math-tex\">$\\dfrac{1}{2}$<\/span>","<strong>D<\/strong>. <span class=\"math-tex\">$\\dfrac{7}{18}$<\/span>"],"correct":"4","level":"3","hint":"<p>Rút g\u1ecdn các nhân t\u1eed chung c\u1ee7a t\u1eed và m\u1eabu.<\/p>","answer":"<p>Rút g\u1ecdn các nhân t\u1eed chung c\u1ee7a t\u1eed và m\u1eabu.<\/p><p>Ta có <span class=\"math-tex\">$\\dfrac{3^{5}.7^{6}}{2.3^{7}.7^{5}}\u200b\u200b=\u200b\u200b\u200b\u200b\\dfrac{3^{5}.7^{5}.7}{2.3^{5}.3^{2}.7^{5}}=\\dfrac{7}{2.3^{2}}=$<\/span> <span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{7}{18}$<\/span><\/span>.<\/p><p>(Nhân t\u1eed chung là <span style=\"color:#3498db;\"><span class=\"math-tex\">$3^{5}.7^{5}$<\/span><\/span> )<\/p><p>V\u1eady \u0111áp án \u0111úng là <strong><span style=\"color:#16a085;\">D<\/span><\/strong>.<span class=\"frac123\"><span class=\"ts\"><span style=\"color:#16a085;\"><strong>7<\/strong><\/span><\/span><span style=\"color:#16a085;\"><strong><span class=\"ms\">18<\/span><\/strong><\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-18 12:39:17","option_type":"math","len":0}]}