Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"4514","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6415","post_id":"4514","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tìm x bi\u1ebft <\/p><p><span class=\"math-tex\">$\\left( x+\\dfrac{5}{4} - \\dfrac{10}{3} \\right) : \\left( 3+\\dfrac{7}{6}-\\dfrac{3}{4} \\right) = \\dfrac{12}{41}$<\/span><\/p><div class=\"lt123_imgs\"><img class=\"img_dd tiny\" src=\"\/data\/library\/hoa-qua\/Ro_tao.png\" \/><\/div>","options":["<span class=\"math-tex\">$x=\\dfrac{37}{12}$<\/span>","<span class=\"math-tex\">$x=\\dfrac{-13}{12}$<\/span>","<span class=\"math-tex\">$x = \\dfrac{13}{12}$<\/span>"],"correct":"1","level":"3","hint":"","answer":"<p><span class=\"math-tex\">$\\left( x+\\dfrac{5}{4} - \\dfrac{10}{3} \\right) : \\left( 3+\\dfrac{7}{6}-\\dfrac{3}{4} \\right) = \\dfrac{12}{41}$<\/span><\/p><p><span class=\"math-tex\">$\\left( x+\\dfrac{15}{12} - \\dfrac{40}{12} \\right) : \\left( \u200b\u200b\\dfrac{36}{12}+\\dfrac{14}{12}-\\dfrac{9}{12} \\right) = \\dfrac{12}{41}$<\/span><\/p><p><span class=\"math-tex\">$\\left( x+\\dfrac{15-40}{12} \\right) : \\left( \\dfrac{36+14-9}{12} \\right) = \\dfrac{12}{41}$<\/span><\/p><p><span class=\"math-tex\">$\\left( x+\\dfrac{-25}{12} \\right) : \\dfrac{41}{12} = \\dfrac{12}{41}$<\/span> <\/p><p> <span class=\"math-tex\">$x-\\dfrac{25}{12}=\\dfrac{12}{41} . \\dfrac{41}{12}$<\/span><\/p><p> <span class=\"math-tex\">$x - \\dfrac{25}{12} =1$<\/span><\/p><p> <span class=\"math-tex\">$x = 1+\\dfrac{25}{12}$<\/span><\/p><p> <span class=\"math-tex\">$x = \\dfrac{12}{12}+\\dfrac{25}{12}$<\/span><\/p><p> <span class=\"math-tex\">$x = \\dfrac{12+25}{12}$<\/span><\/p><p> <span style=\"color:#16a085;\"><span class=\"math-tex\">$x = \\dfrac{37}{12}$<\/span><\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><span class=\"math-tex\">$x = \\dfrac{37}{12}$<\/span> .<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-24 13:18:42","option_type":"math","len":0},{"id":"6418","post_id":"4514","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tìm x bi\u1ebft<\/p><p><span class=\"math-tex\">$\u200b\u200b\\dfrac{8}{15}- \\left( \\dfrac{8}{21} + x \\right) . \\dfrac{17}{12} = \\dfrac{11}{10}$<\/span><\/p><div class=\"lt123_imgs\"><img class=\"img_dd tiny\" src=\"\/data\/library\/hoa-qua\/bao-dua-hau.png\" \/><\/div>","options":["<span class=\"math-tex\">$x =\\dfrac{82}{105}$<\/span>","<span class=\"math-tex\">$x =\\dfrac{-82}{105}$<\/span>","<span class=\"math-tex\">$x = \\dfrac{-2}{105}$<\/span>"],"correct":"2","level":"3","hint":"","answer":"<p>H\u01b0\u1edbng d\u1eabn: <\/p><p>B1. Xem <span class=\"math-tex\">$\\left( \u200b\u200b\\dfrac{8}{21}+x \\right).\\dfrac{17}{12}$<\/span> là s\u1ed1 tr\u1eeb, tìm s\u1ed1 tr\u1eeb b\u1eb1ng cách l\u1ea5y s\u1ed1 b\u1ecb tr\u1eeb tr\u1eeb cho hi\u1ec7u<\/p><p>B2. Xem <span class=\"math-tex\">$\\left( \\dfrac{8}{21} + x \\right) $<\/span> là th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft, tìm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft b\u1eb1ng cách l\u1ea5y tích chia cho th\u1eeba s\u1ed1 \u0111ã bi\u1ebft.<\/p><p>B3. Tìm x nh\u01b0 tìm s\u1ed1 h\u1ea1ng ch\u01b0a bi\u1ebft c\u1ee7a m\u1ed9t t\u1ed5ng.<\/p><p>Gi\u1ea3i chi ti\u1ebft.<\/p><p><span class=\"math-tex\">$\u200b\u200b\\dfrac{8}{15}- \\left( \\dfrac{8}{21} + x \\right) . \\dfrac{17}{12} = \\dfrac{11}{10}$<\/span><\/p><p><span class=\"math-tex\">$\\left( \\dfrac{8}{21} + x \\right) .\\dfrac{17}{12} = \\dfrac{8}{15} - \\dfrac{11}{10}$<\/span><\/p><p><span class=\"math-tex\">$\\left( \\dfrac{8}{21} + x \\right) .\\dfrac{17}{12} = \\dfrac{16}{30} - \\dfrac{33}{30}$<\/span><\/p><p><span class=\"math-tex\">$\\left( \\dfrac{8}{21} + x \\right) .\\dfrac{17}{12} = \\dfrac{16-33}{30} $<\/span><\/p><p><span class=\"math-tex\">$\\left( \\dfrac{8}{21} + x \\right) .\\dfrac{17}{12} = \\dfrac{-17}{30}$<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{8}{21} + x = \\dfrac{-17}{30}:\\dfrac{17}{12} $<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{8}{21} + x = \\dfrac{-17}{30}.\\dfrac{12}{17} $<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{8}{21} + x = \\dfrac{-12}{30}$<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{8}{21} + x = \\dfrac{-2}{5}$<\/span><\/p><p><span class=\"math-tex\">$ x = \\dfrac{-2}{5} -\u200b\u200b\\dfrac{8}{21}$<\/span><\/p><p><span class=\"math-tex\">$ x = \\dfrac{-42}{105} -\u200b\u200b\\dfrac{40}{105}$<\/span><\/p><p><span class=\"math-tex\">$ x = \\dfrac{-42-40}{105}$<\/span><\/p><p><span style=\"color:#16a085;\"><span class=\"math-tex\">$ x = \\dfrac{-82}{105}$<\/span><\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><span class=\"math-tex\">$ x = \\dfrac{-82}{105}$<\/span> .<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-24 13:52:59","option_type":"math","len":0},{"id":"6420","post_id":"4514","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính giá tr\u1ecb c\u1ee7a bi\u1ec3u th\u1ee9c<\/p><p>A = <span class=\"math-tex\">$\\dfrac{1^{2}}{1.2}.\\dfrac{2^{2}}{2.3}.\\dfrac{3^{2}}{3.4}.\\dfrac{4^{2}}{4.5}.\\dfrac{5^{2}}{5.6}.\\dfrac{6^{2}}{6.7}$<\/span><\/p><div class=\"lt123_imgs\"><img class=\"img_dd tiny\" src=\"\/data\/library\/hoa-qua\/c6-b9.png\" \/><\/div>","options":["<span class=\"math-tex\">$\\dfrac{1}{7}$<\/span>","<span class=\"math-tex\">$\\dfrac{2}{7}$<\/span>","<span class=\"math-tex\">$\\dfrac{3}{7}$<\/span>"],"correct":"1","level":"3","hint":"<p>Chú ý rút g\u1ecdn các nhân t\u1eed chung \u1edf t\u1eed và m\u1eabu.<\/p>","answer":"<p>A = <span class=\"math-tex\">$\\dfrac{1^{2}}{1.2}.\\dfrac{2^{2}}{2.3}.\\dfrac{3^{2}}{3.4}.\\dfrac{4^{2}}{4.5}.\\dfrac{5^{2}}{5.6}.\\dfrac{6^{2}}{6.7}$<\/span><\/p><p>A = <span class=\"math-tex\">$\\dfrac{1.2^{2}.3^{2}.4^{2}.5^{2}.6^{2}}{1.2.2.3.3.4.4.5.5.6.6.7}$<\/span><\/p><p>A = <span class=\"math-tex\">$\\dfrac{1.2^{2}.3^{2}.4^{2}.5^{2}.6^{2}}{1.2^{2}.3^{2}.4^{2}.5^{2}.6^{2}.7}$<\/span> (nhân t\u1eed chung là <span class=\"math-tex\">$2^{2}.3^{2}.4^{2}.5^{2}.6^{2}$<\/span> )<\/p><p><span style=\"color:#16a085;\"><strong>A = <span class=\"math-tex\">$\\dfrac{1}{7}$<\/span><\/strong><\/span><\/p><p>\u0110áp án \u0111úng là <b> <span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{1}{7}$<\/span><\/span><\/b><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-24 14:20:47","option_type":"math","len":0}]}