{"common":{"save":0,"post_id":"6194","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5499","mon_id":"1158767","chapter_id":"1158770","post_id":"6194","question":"<p>Trong c&aacute;c t\u1eadp h\u1ee3p sau, t\u1eadp h\u1ee3p n&agrave;o c&oacute; \u0111&uacute;ng hai t\u1eadp h\u1ee3p con?<\/p>","options":["<strong>A.<\/strong> { x; y }","<strong>B.<\/strong> { &Oslash; ; x }","<strong>C.<\/strong> { x }","<strong>D.<\/strong> { x ; y ; &Oslash; }"],"correct":"3","level":"2","hint":"","answer":"<p>T\u1eadp h\u1ee3p { x } c&oacute; hai t\u1eadp h\u1ee3p con l&agrave; t\u1eadp&nbsp;&Oslash; v&agrave;&nbsp;{ x }.<\/p><p>\u0110&aacute;p &aacute;n l&agrave;&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;{ x }<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-11 10:34:45","option_type":"txt","len":2},{"id":"5500","mon_id":"1158767","chapter_id":"1158770","post_id":"6194","question":"<p>C&aacute;ch vi\u1ebft n&agrave;o sau \u0111&acirc;y <b>\u0111&uacute;ng<\/b>?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$a\\subset[a;b]$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\{a\\}\\subset[a;b]$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\{a\\}\\in[a;b]$<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$a\\subset(a;b]$<\/span>"],"correct":"2","level":"2","hint":"<p>Ta d&ugrave;ng k&iacute; hi\u1ec7u&nbsp;&isin; v&agrave;&nbsp;&notin; \u0111\u1ec3 ch\u1ec9 m\u1ed1i quan h\u1ec7 gi\u1eefa ph\u1ea7n t\u1eed v&agrave; t\u1eadp h\u1ee3p.<\/p><p>Ta d&ugrave;ng k&iacute; hi\u1ec7u&nbsp;&sub; v&agrave;&nbsp;<span class=\"math-tex\">$\\not\\subset$<\/span>&nbsp;\u0111\u1ec3 ch\u1ec9 m\u1ed1i quan h\u1ec7 gi\u1eefa hai t\u1eadp h\u1ee3p.<\/p>","answer":"<p><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$a\\subset[a;b]$<\/span>&nbsp; &nbsp; &nbsp;(<span style=\"color:#e74c3c;\">sai <\/span>v&igrave; <span class=\"math-tex\">$a$<\/span> l&agrave; ph\u1ea7n t\u1eed, c&ograve;n&nbsp;<span class=\"math-tex\">$[a;b]$<\/span>&nbsp;l&agrave; t\u1eadp h\u1ee3p)<\/p><p><strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\{a\\}\\subset[a;b]$<\/span>&nbsp; (<span style=\"color:#16a085;\">\u0111&uacute;ng<\/span>)<\/p><p><strong>C.<\/strong>&nbsp;<span class=\"math-tex\">$\\{a\\}\\in[a;b]$<\/span>&nbsp;&nbsp;(<span style=\"color:#e74c3c;\">sai <\/span>v&igrave; <span class=\"math-tex\">$\\{a\\}$<\/span> v&agrave;&nbsp;<span class=\"math-tex\">$[a;b]$<\/span>&nbsp;l&agrave; t\u1eadp h\u1ee3p)<\/p><p><strong>D.&nbsp;<\/strong><span class=\"math-tex\">$a\\subset(a;b]$<\/span>&nbsp; &nbsp;&nbsp;&nbsp;(<span style=\"color:#e74c3c;\">sai <\/span>v&igrave; <span class=\"math-tex\">$a$<\/span> l&agrave; ph\u1ea7n t\u1eed, c&ograve;n&nbsp;<span class=\"math-tex\">$(a;b]$<\/span>&nbsp;l&agrave; t\u1eadp h\u1ee3p)<\/p><p>\u0110&aacute;p &aacute;n \u0111&uacute;ng l&agrave;&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\{a\\}\\subset[a;b]$<\/span><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2022-09-11 10:44:32","option_type":"math","len":0},{"id":"5501","mon_id":"1158767","chapter_id":"1158770","post_id":"6194","question":"<p>G\u1ecdi&nbsp;<span class=\"math-tex\">$B_n$<\/span>&nbsp;l&agrave; t\u1eadp h\u1ee3p c&aacute;c b\u1ed9i s\u1ed1 c\u1ee7a&nbsp;<span class=\"math-tex\">$n$<\/span>&nbsp;trong&nbsp;<span class=\"math-tex\">$\\mathbb{N}$<\/span>. X&aacute;c \u0111\u1ecbnh t\u1eadp h\u1ee3p&nbsp;<span class=\"math-tex\">$B_2\\cap B_4$<\/span>.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$B_4$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$B_8$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\varnothing $<\/span>","<strong>D. <\/strong><span class=\"math-tex\">$B_2$<\/span>"],"correct":"1","level":"2","hint":"<p>Giao c\u1ee7a hai t\u1eadp h\u1ee3p g\u1ed3m c&aacute;c ph\u1ea7n t\u1eed thu\u1ed9c c\u1ea3 hai t\u1eadp h\u1ee3p \u0111&oacute;.<\/p><p>A&nbsp;&cap; B = { x | x&nbsp;&isin; A v&agrave; x&nbsp;&isin; B }<\/p>","answer":"<p>Ta c&oacute;:<\/p><p><span class=\"math-tex\">$B_2=\\{2k|k\\in\\mathbb{N}\\}=\\{0;2;4;6;8;10;12;...\\}$<\/span><\/p><p><span class=\"math-tex\">$B_4=\\{4k|k\\in\\mathbb{N}\\}=\\{0;4;8;12;16...\\}$<\/span><\/p><p>Suy ra&nbsp;<span class=\"math-tex\">$B_2\\cap B_4=\\{0;4;8;12;16;..\\}=B_4$<\/span><\/p><p>\u0110&aacute;p &aacute;n l&agrave;&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;<span class=\"math-tex\">$B_4$<\/span><\/span><\/p>","type":"choose","extra_type":"shape2","user_id":"131","test":"0","date":"2022-09-11 10:56:24","option_type":"math","len":0}]}