{"common":{"save":0,"post_id":"7047","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"4836","post_id":"7047","mon_id":"1158924","chapter_id":"1159147","question":"<p>Trong c&aacute;c d&atilde;y s\u1ed1&nbsp;<span class=\"math-tex\">$(u_n)$<\/span>&nbsp;cho b\u1edfi s\u1ed1 h\u1ea1ng t\u1ed5ng qu&aacute;t&nbsp;<span class=\"math-tex\">$u_n$<\/span>&nbsp;sau, d&atilde;y s\u1ed1 n&agrave;o sau \u0111&acirc;y l&agrave; d&atilde;y s\u1ed1 t\u0103ng?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$u_n=\\dfrac{1}{2^n}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$u_n=\\dfrac{1}{n}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$u_n=n$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$u_n=(-1)^n$<\/span>"],"correct":"3","level":"3","hint":"","answer":"<p>D&atilde;y s\u1ed1&nbsp;<span class=\"math-tex\">$(u_n)$<\/span>&nbsp;v\u1edbi&nbsp;<span class=\"math-tex\">$u_n=n$<\/span>&nbsp;l&agrave; d&atilde;y c&aacute;c s\u1ed1 nguy&ecirc;n d\u01b0\u01a1ng t\u0103ng d\u1ea7n.<\/p><p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"> &nbsp;<strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$u_n=n$<\/span>&nbsp;.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-12-03 04:06:36","option_type":"math","len":0},{"id":"4837","post_id":"7047","mon_id":"1158924","chapter_id":"1159147","question":"<p>Cho d&atilde;y s\u1ed1&nbsp;<span class=\"math-tex\">$(u_n)$<\/span>&nbsp;v\u1edbi&nbsp;<span class=\"math-tex\">$u_n=n$<\/span>&nbsp;. Kh\u1eb3ng \u0111\u1ecbnh n&agrave;o sau \u0111&acirc;y l&agrave; <strong>sai<\/strong>?<\/p>","options":["<strong>A.<\/strong> N\u0103m s\u1ed1 h\u1ea1ng \u0111\u1ea7u c\u1ee7a d&atilde;y l&agrave; 1; 2; 3; 4; 5.","<strong>B.<\/strong> B\u1ecb ch\u1eb7n tr&ecirc;n b\u1edfi s\u1ed1 M = 0.","<strong>C.<\/strong> B\u1ecb ch\u1eb7n d\u01b0\u1edbi b\u1edfi s\u1ed1 M = 0.","<strong>D.<\/strong> L&agrave; d&atilde;y s\u1ed1 t\u0103ng."],"correct":"2","level":"3","hint":"","answer":"<p>Nh\u1eadn x&eacute;t&nbsp;<span class=\"math-tex\">$u_n>0;\\forall n\\in N^*$<\/span>&nbsp;n&ecirc;n d&atilde;y s\u1ed1 b\u1ecb ch\u1eb7n d\u01b0\u1edbi b\u1edfi M = 0.<\/p><p>C&acirc;u sai l&agrave;&nbsp; &nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;B\u1ecb ch\u1eb7n tr&ecirc;n b\u1edfi s\u1ed1 M = 0.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-12-03 04:14:02","option_type":"txt","len":3},{"id":"4839","post_id":"7047","mon_id":"1158924","chapter_id":"1159147","question":"<p>Cho d&atilde;y s\u1ed1&nbsp;<span class=\"math-tex\">$(u_n)$<\/span>&nbsp;v\u1edbi&nbsp;<span class=\"math-tex\">$u_n=\\dfrac{1}{n^2+n}$<\/span>&nbsp;. Kh\u1eb3ng \u0111\u1ecbnh n&agrave;o sau \u0111&acirc;y l&agrave; <strong>sai<\/strong>?<\/p>","options":["<strong>A.<\/strong> 5 s\u1ed1 h\u1ea1ng \u0111\u1ea7u ti&ecirc;n c\u1ee7a d&atilde;y l&agrave; <span class=\"math-tex\">$\\dfrac{1}{2};\\dfrac{1}{6};\\dfrac{1}{12};\\dfrac{1}{20};\\dfrac{1}{30}$<\/span> .","<strong>B.<\/strong> L&agrave; d&atilde;y s\u1ed1 t\u0103ng.","<strong>C.<\/strong> B\u1ecb ch\u1eb7n tr&ecirc;n b\u1edfi s\u1ed1 M = <span class=\"math-tex\">$\\dfrac{1}{2}$<\/span>","<strong>D.<\/strong> Kh&ocirc;ng b\u1ecb ch\u1eb7n."],"correct":"2","level":"3","hint":"","answer":"<p>Ta c&oacute;&nbsp;<span class=\"math-tex\">$u_1=\\dfrac{1}{2};u_2=\\dfrac{1}{6}$<\/span>&nbsp;n&ecirc;n&nbsp;<span class=\"math-tex\">$u_1>u_2$<\/span>&nbsp;. V\u1eady&nbsp;<span class=\"math-tex\">$(u_n)$<\/span>&nbsp;kh&ocirc;ng l&agrave; d&atilde;y t\u0103ng.<\/p><p>C&acirc;u sai l&agrave;&nbsp; &nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong> L&agrave; d&atilde;y s\u1ed1 t\u0103ng.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-12-03 04:24:09","option_type":"math","len":0}]}