Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"4572","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6638","post_id":"4572","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tìm x, bi\u1ebft <span class=\"frac123\"><span class=\"ts\">1<\/span><span class=\"ms\">3<\/span><\/span> <strong>.<\/strong> x - <span class=\"frac123\"><span class=\"ts\">5<\/span><span class=\"ms\">9<\/span><\/span> = <span class=\"frac123\"><span class=\"ts\">17<\/span><span class=\"ms\">5<\/span><\/span> <strong>. <\/strong><span class=\"frac123\"><span class=\"ts\">25<\/span><span class=\"ms\">3<\/span><\/span> <\/p>","options":["<span class=\"math-tex\">$x = \\dfrac{260}{3}$<\/span>","<span class=\"math-tex\">$x =\\dfrac{260}{9}$<\/span>","<span class=\"math-tex\">$x =\\dfrac{255}{9}$<\/span>"],"correct":"1","level":"2","hint":"<p>Mu\u1ed1n tìm s\u1ed1 b\u1ecb tr\u1eeb ta l\u1ea5y hi\u1ec7u c\u1ed9ng v\u1edbi s\u1ed1 tr\u1eeb. <\/p><p>Mu\u1ed1n tìm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft ta l\u1ea5y tích chia cho th\u1eeba s\u1ed1 \u0111ã bi\u1ebft.<\/p>","answer":"<p><span class=\"math-tex\">$\\dfrac{1}{3}x-\\dfrac{5}{9}=\\dfrac{17}{5}.\\dfrac{25}{3}$<\/span> (làm g\u1ecdn v\u1ebf ph\u1ea3i tr\u01b0\u1edbc)<\/p><p><span class=\"math-tex\">$\\dfrac{1}{3}x-\\dfrac{5}{9}=\\dfrac{17.5}{1.3}$<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{1}{3}x-\\dfrac{5}{9}=\\dfrac{85}{3}$<\/span> (tìm s\u1ed1 b\u1ecb tr\u1eeb)<\/p><p><span class=\"math-tex\">$\\dfrac{1}{3}x=\\dfrac{85}{3}+\\dfrac{5}{9}$<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{1}{3}x=\\dfrac{255}{9}+\\dfrac{5}{9}$<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{1}{3}x=\\dfrac{255+5}{9}$<\/span><\/p><p><span class=\"math-tex\">$\\dfrac{1}{3}x=\\dfrac{260}{9}$<\/span> (tìm th\u1eeba s\u1ed1 ch\u01b0a bi\u1ebft)<\/p><p><span class=\"math-tex\">$x = \\dfrac{260}{9}:\\dfrac{1}{3}$<\/span><\/p><p><span class=\"math-tex\">$x = \\dfrac{260}{9}.\\dfrac{3}{1}$<\/span><\/p><p><span style=\"color:#16a085;\"><span class=\"math-tex\">$x=\\dfrac{260}{3}$<\/span><\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><span class=\"math-tex\">$x=\\dfrac{260}{3}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-26 15:21:31","option_type":"math","len":0},{"id":"6640","post_id":"4572","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính <span class=\"frac123\"><span class=\"ts\">7<\/span><span class=\"ms\">4<\/span><\/span> c\u1ee7a 116.<\/p>","options":["203","204","205"],"correct":"1","level":"2","hint":"<p>Mu\u1ed1n tính <span class=\"math-tex\">$\u200b\u200b\\dfrac{m}{n}$<\/span> c\u1ee7a s\u1ed1 a, ta tính <span class=\"math-tex\">$a.\\dfrac{m}{n}$<\/span>.<\/p>","answer":"<p><span class=\"math-tex\">$\\dfrac{7}{4}$<\/span> c\u1ee7a 116 là <span class=\"math-tex\">$\\dfrac{7}{4}.116=7.29=$<\/span> <span style=\"color:#16a085;\">203<\/span><\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>203<\/strong><\/span><\/p>","type":"choose","extra_type":"flower","time":"0","user_id":"131","test":"1","date":"2021-08-26 15:25:10","option_type":"txt","len":0},{"id":"6644","post_id":"4572","mon_id":"1158113","chapter_id":"1158119","question":"<p>Cho phép \u0111\u1ed5i kh\u1ed1i l\u01b0\u1ee3ng sau:<\/p><p><strong>A.<\/strong> 4 t\u1ea1 = <span class=\"frac123\"><span class=\"ts\">2<\/span><span class=\"ms\">5<\/span><\/span> t\u1ea5n ; <strong>B.<\/strong> 15 kg = <span class=\"frac123\"><span class=\"ts\">3<\/span><span class=\"ms\">20<\/span><\/span> t\u1ea5n ; <\/p><p><strong>C.<\/strong> 104 t\u1ea1 = <span class=\"frac123\"><span class=\"ts\">52<\/span><span class=\"ms\">5<\/span><\/span> t\u1ea5n ; <strong>D.<\/strong> 32 g = <span class=\"frac123\"><span class=\"ts\">4<\/span><span class=\"ms\">125<\/span><\/span> kg<\/p><p>S\u1ed1 các phép \u0111\u1ed5i <strong>\u0111úng <\/strong>là<strong> <\/strong><input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/><\/p>","options":"","correct":["[\"3\"]"],"level":"2","hint":"<p>1 t\u1ea5n = 10 t\u1ea1 ; 1 t\u1ea5n = 1000 kg ; 1 kg = 1000 g<\/p>","answer":"<p><span style=\"color:#16a085;\"><strong>A.<\/strong><\/span> 4 t\u1ea1 = <span class=\"math-tex\">$\\dfrac{2}{5}$<\/span> t\u1ea5n (<span style=\"color:#16a085;\">\u0111úng<\/span> vì 4 t\u1ea1 = <span class=\"math-tex\">$\\dfrac{4}{10}$<\/span> t\u1ea5n = <span class=\"math-tex\">$\\dfrac{4:2}{10:2}$<\/span> t\u1ea5n = <span class=\"math-tex\">$\\dfrac{2}{5}$<\/span> t\u1ea5n)<\/p><p>B. 15 kg = <span class=\"math-tex\">$\\dfrac{3}{20}$<\/span> t\u1ea5n (<span style=\"color:#c0392b;\">sai<\/span> vì 15 kg = <span class=\"math-tex\">$\\dfrac{15}{1000}$<\/span> t\u1ea5n = <span class=\"math-tex\">$\\dfrac{15:5}{1000:5}$<\/span> t\u1ea5n = <span class=\"math-tex\">$\\dfrac{3}{200}$<\/span> t\u1ea5n)<\/p><p><span style=\"color:#16a085;\"><strong>C. <\/strong><\/span> 104 t\u1ea1 = <span class=\"math-tex\">$\\dfrac{52}{5}$<\/span> t\u1ea5n (<span style=\"color:#16a085;\">\u0111úng<\/span> vì 104 t\u1ea1 = <span class=\"math-tex\">$\\dfrac{104}{10}$<\/span> t\u1ea5n = <span class=\"math-tex\">$\\dfrac{104:2}{10:2}$<\/span> t\u1ea5n = <span class=\"math-tex\">$\\dfrac{52}{5}$<\/span> t\u1ea5n)<\/p><p><strong><span style=\"color:#16a085;\">D.<\/span> <\/strong> 32 g = <span class=\"math-tex\">$\\dfrac{4}{125}$<\/span> kg (<span style=\"color:#16a085;\">\u0111úng<\/span> vì 32 g <span class=\"math-tex\">$= \\dfrac{32}{1000}$<\/span> kg = <span class=\"math-tex\">$\\dfrac{32:8}{1000:8}$<\/span> kg = <span class=\"math-tex\">$\\dfrac{4}{125}$<\/span> kg)<\/p><p>V\u1eady có <span style=\"color:#16a085;\">3 phép \u0111\u1ed5i \u0111úng<\/span>.<\/p><p>S\u1ed1 c\u1ea7n \u0111i\u1ec1n là <span style=\"color:#16a085;\"><strong>3<\/strong><\/span> .<\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"3","date":"2021-08-26 15:42:04"}]}