Chú ý: Để đảm bảo quyền lợi và bảo vệ tài khoản của mình
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{"common":{"save":0,"post_id":"4468","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6042","post_id":"4468","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính <\/p><p><span class=\"math-tex\">$ \\dfrac{5}{12} + \\dfrac{-13}{12}$<\/span> = ?<\/p>","options":["<strong>A. <\/strong><span class=\"math-tex\">$ \\dfrac{8}{12}$<\/span>","<strong>B. <\/strong><span class=\"math-tex\">$ \\dfrac{-8}{12}$<\/span>","<strong>C. <\/strong><span class=\"math-tex\">$\\dfrac{-2}{3}$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$ \\dfrac{2}{3}$<\/span>"],"correct":"3","level":"1","hint":"<p>Mu\u1ed1n c\u1ed9ng hai phân s\u1ed1 có cùng m\u1eabu, ta c\u1ed9ng các t\u1eed và gi\u1eef nguyên m\u1eabu. N\u1ebfu k\u1ebft qu\u1ea3 ch\u01b0a t\u1ed1i gi\u1ea3n thì ph\u1ea3i rút g\u1ecdn v\u1ec1 t\u1ed1i gi\u1ea3n.<\/p>","answer":"<p>Mu\u1ed1n c\u1ed9ng hai phân s\u1ed1 có cùng m\u1eabu ta c\u1ed9ng các t\u1eed và gi\u1eef nguyên m\u1eabu.<\/p><p>Ta có: <span class=\"math-tex\">$ \\dfrac{5}{12}+ \\dfrac{-13}{12} = \\dfrac{5+(-13)}{12}= \\dfrac{-8}{12} =$<\/span> <span style=\"color:#16a085;\"><span class=\"math-tex\">$ \\dfrac{-2}{3}$<\/span><\/span> (rút v\u1ec1 t\u1ed1i gi\u1ea3n b\u1eb1ng cách chia c\u1ea3 t\u1eed và m\u1eabu cho 4).<\/p><p>\u0110áp án \u0111úng là <strong><span style=\"color:#16a085;\">C<\/span><\/strong>.<span style=\"color:#16a085;\"><span class=\"math-tex\">$ \\dfrac{-2}{3}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-20 10:59:10","option_type":"math","len":0},{"id":"6043","post_id":"4468","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính <\/p><p><span class=\"math-tex\">$\\dfrac{-6}{5} + \\dfrac{2}{5} + \\dfrac{4}{5}$<\/span> = <input class=\"tim_x input_number\" tpl=\"dien_so\" type=\"text\"\/> <\/p><div class=\"lt123_imgs\"><img class=\"img_dd tiny\" src=\"\/data\/library\/chu_cai_chu_so\/hoa.png\" \/><img class=\"img_dd tiny\" src=\"\/data\/library\/chu_cai_chu_so\/thang.png\" \/><\/div>","options":"","correct":["[\"0\"]"],"level":"1","hint":"<p>C\u1ed9ng các t\u1eed và gi\u1eef nguyên m\u1eabu. \u0110\u01b0a k\u1ebft qu\u1ea3 v\u1ec1 phân s\u1ed1 t\u1ed1i gi\u1ea3n.<\/p>","answer":"<p>Ta có <span class=\"math-tex\">$ \\dfrac{-6}{5}+ \\dfrac{2}{5}+ \\dfrac{4}{5}= \\dfrac{-6+2+4}{5} =\\dfrac{0}{5}=$<\/span> <span style=\"color:#16a085;\"><span class=\"math-tex\">$0$<\/span><\/span><\/p><p>Ch\u1ed7 tr\u1ed1ng c\u1ea7n \u0111i\u1ec1n là s\u1ed1 <strong><span style=\"color:#16a085;\">0<\/span><\/strong>.<\/p>","type":"blank","extra_type":"","time":"0","user_id":"131","test":"1","date":"2021-08-20 11:05:29"},{"id":"6050","post_id":"4468","mon_id":"1158113","chapter_id":"1158119","question":"<p>Tính<\/p><p><span class=\"math-tex\">$\\dfrac{23}{6}+\\dfrac{17}{9}$<\/span> = ?<\/p>","options":["<strong>A<\/strong>. <span class=\"math-tex\">$\\dfrac{103}{18}$<\/span>","<strong>B<\/strong>. <span class=\"math-tex\">$\\dfrac{18}{103}$<\/span>","<strong>C<\/strong>. <span class=\"math-tex\">$\\dfrac{40}{15}$<\/span>"],"correct":"1","level":"1","hint":"<p>Mu\u1ed1n c\u1ed9ng hai phân s\u1ed1 không cùng m\u1eabu, ta quy \u0111\u1ed3ng m\u1eabu hai phân s\u1ed1 r\u1ed3i c\u1ed9ng các t\u1eed m\u1edbi và gi\u1eef nguyên m\u1eabu m\u1edbi.<\/p>","answer":"<p>MC: 18<\/p><p>Ta có: <span class=\"math-tex\">$\\dfrac{23}{6}+\\dfrac{17}{9}=\\dfrac{23.3}{6.3}+\\dfrac{17.2}{9.2}= \\dfrac{69}{18}+\\dfrac{34}{18}=\\dfrac{69+34}{18}=$<\/span> <span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{103}{18}$<\/span> <\/span><\/p><p>\u0110áp án là <span style=\"color:#16a085;\"><strong>A<\/strong><\/span>.<span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{103}{18}$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"131","test":"1","date":"2021-08-20 11:54:49","option_type":"math","len":0}]}