Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"5642","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6793","post_id":"5642","mon_id":"1158532","chapter_id":"1158544","question":"<p>K\u1ebft qu\u1ea3 c\u1ee7a phép tính<\/p><p><span class=\"math-tex\">$\\left( 10+5\\dfrac{3}{4}-\\dfrac{6}{5} \\right)-(6-0,2)-\\left( 7\\dfrac{3}{4} +12\\right)$<\/span><\/p>","options":["<strong>A.<\/strong> 19","<strong>B.<\/strong> -11","<strong>C.<\/strong> -31","<strong>D.<\/strong> -20"],"correct":"2","level":"2","hint":"","answer":"<p><span class=\"math-tex\">$\\left( 10+5\\dfrac{3}{4}-\\dfrac{6}{5} \\right)-(6-0,2)-\\left( 7\\dfrac{3}{4} +12\\right)$<\/span><\/p><p><span class=\"math-tex\">$ =10+5\\dfrac{3}{4}-\\dfrac{6}{5} -6+0,2-7\\dfrac{3}{4} -12$<\/span><\/p><p>=10 - 6 - 12 + <span class=\"math-tex\">$5\\dfrac{3}{4}-7\\dfrac{3}{4}+0,2-\\dfrac{6}{5}$<\/span><\/p><p>= (10 - 6 - 12) + <span class=\"math-tex\">$\\left(5\\dfrac{3}{4}-7\\dfrac{3}{4}\\right)+\\left(\\dfrac{1}{5} -\\dfrac{6}{5}\\right)$<\/span><\/p><p>= -8 + <span class=\"math-tex\">$\\left(\\dfrac{23}{4}-\\dfrac{31}{4}\\right)+\\left(\\dfrac{1-6}{5} \\right)$<\/span><\/p><p>= -8 + <span class=\"math-tex\">$\\dfrac{-8}{4}+\\dfrac{-5}{5}$<\/span><\/p><p>= -8 - 2 - 1<\/p><p>= -11<\/p><p>\u0110áp án \u0111úng là <span style=\"color:#16a085;\"><strong>B. <\/strong>-11<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2022-03-29 08:16:46","option_type":"txt","len":0},{"id":"6794","post_id":"5642","mon_id":"1158532","chapter_id":"1158544","question":"<p>K\u1ebft qu\u1ea3 c\u1ee7a phép tính<\/p><p> <span class=\"math-tex\">$\\left( 5-\\dfrac{1}{2}+\\dfrac{7}{4} \\right) : \\left( 9+\\dfrac{3}{4}-\\dfrac{3}{8} \\right)$<\/span> = <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><\/p>","options":"","correct":["[\"2\",\"3\"]"],"level":"2","hint":"","answer":"<p> <span class=\"math-tex\">$\\left( 5-\\dfrac{1}{2}+\\dfrac{7}{4} \\right) : \\left( 9+\\dfrac{3}{4}-\\dfrac{3}{8} \\right)$<\/span><\/p><p> <span class=\"math-tex\">$=\\left( \\dfrac{20}{4}-\\dfrac{2}{4}+\\dfrac{7}{4} \\right) : \\left( \\dfrac{72}{8}+\\dfrac{6}{8}-\\dfrac{3}{8} \\right)$<\/span><\/p><p> <span class=\"math-tex\">$=\\left( \\dfrac{20-2+7}{4} \\right) : \\left( \\dfrac{72+6-3}{8}\\right)$<\/span><\/p><p><span class=\"math-tex\">$=\\dfrac{25}{4}:\\dfrac{75}{8}$<\/span><\/p><p><span class=\"math-tex\">$=\\dfrac{25}{4}.\\dfrac{8}{75}$<\/span><\/p><p><span class=\"math-tex\">$=\\dfrac{25.4.2}{4.25.3}$<\/span> (rút g\u1ecdn t\u1eed và m\u1eabu cho 25 . 4)<\/p><p><span class=\"math-tex\">$=\\dfrac{2}{3}$<\/span><\/p><p>Các s\u1ed1 c\u1ea7n \u0111i\u1ec1n là <span style=\"color:#16a085;\">2 và 3<\/span> (phân s\u1ed1 <span class=\"math-tex\">$\\dfrac{2}{3}$<\/span> )<\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2022-03-29 08:28:19"},{"id":"6796","post_id":"5642","mon_id":"1158532","chapter_id":"1158544","question":"<p>Nh\u1eefng phép tính nào cho k\u1ebft qu\u1ea3 là m\u1ed9t s\u1ed1 âm?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{2}{3}-0,4$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$(-0,1).\\dfrac{6}{-9}$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$\\dfrac{1}{2}:(-4,5)$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{-4}{3}+\\dfrac{1}{4}$<\/span>"],"correct":"[\"3\",\"4\"]","level":"2","hint":"","answer":"<p><strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{2}{3}-0,4=\\dfrac{2}{3}-\\dfrac{4}{10}=\\dfrac{2}{3}-\\dfrac{2}{5}=\\dfrac{10}{15}-\\dfrac{6}{15}=\\dfrac{4}{15}>0$<\/span><\/p><p><strong>B. <\/strong><span class=\"math-tex\">$(-0,1).\\dfrac{6}{-9}=\\dfrac{-1}{10}.\\dfrac{-2}{3}=\\dfrac{2}{30}=\\dfrac{1}{15}>0$<\/span><\/p><p><strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{2}:(-4,5)=\\dfrac{1}{2}:\\dfrac{-45}{10}=\\dfrac{1}{2}:\\dfrac{-9}{2}=\\dfrac{1}{2}.\\dfrac{-2}{9}=\\dfrac{-1}{9}<0$<\/span><\/p><p><strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{-4}{3}+\\dfrac{1}{4}=\\dfrac{-16}{12}+\\dfrac{3}{12}=\\dfrac{-13}{12}<0$<\/span><\/p><p>Các \u0111áp án \u0111úng là <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{1}{2}:(-4,5)$<\/span> và <strong>D.<\/strong> <span class=\"math-tex\">$\\dfrac{-4}{3}+\\dfrac{1}{4}$<\/span><\/span><\/p>","type":"checkbox","extra_type":"classic-checkbox","time":"0","user_id":"131","test":"1","date":"2022-03-29 08:42:20","option_type":"math","len":0}]}