{"common":{"save":0,"post_id":"7806","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7482","post_id":"7806","mon_id":"1159278","chapter_id":"1159327","question":"<p>Cho a, b &isin; R. Trong c&aacute;c kh\u1eb3ng \u0111\u1ecbnh sau kh\u1eb3ng \u0111\u1ecbnh n&agrave;o&nbsp;<strong>\u0111&uacute;ng<\/strong>?<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\sqrt{a}.\\sqrt{b}=\\sqrt{ab}$<\/span>.","<strong>B.<\/strong> <span class=\"math-tex\">$\\sqrt{\\dfrac{a}{b}}=\\dfrac{\\sqrt{a}}{\\sqrt{b}}$<\/span> (v\u1edbi a <span class=\"math-tex\">$\\ge$<\/span> 0, b &gt; 0).","<strong>C.<\/strong> <span class=\"math-tex\">$\\sqrt{a}+\\sqrt{b}=\\sqrt{a+b}$<\/span> (v\u1edbi a, b <span class=\"math-tex\">$\\ge$<\/span> 0).","<strong>D.<\/strong> A, B, C \u0111\u1ec1u \u0111&uacute;ng."],"correct":"2","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>B.<\/strong>&nbsp;<span class=\"math-tex\">$\\sqrt{\\dfrac{a}{b}}=\\dfrac{\\sqrt{a}}{\\sqrt{b}}$<\/span>&nbsp;(v\u1edbi a&nbsp;<span class=\"math-tex\">$\\ge$<\/span>&nbsp;0, b &gt; 0).<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-10 01:13:22","option_type":"math","len":0},{"id":"7483","post_id":"7806","mon_id":"1159278","chapter_id":"1159327","question":"<p>K\u1ebft qu\u1ea3 c\u1ee7a ph&eacute;p t&iacute;nh&nbsp;<span class=\"math-tex\">$\\sqrt{25+144}$<\/span>&nbsp;l&agrave;:<\/p>","options":["<strong>A.<\/strong> 17","<strong>B.<\/strong> 169","<strong>C.<\/strong> 13","<strong>D.<\/strong> <span class=\"math-tex\">$\\pm$<\/span>13"],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;13<\/span><\/p><p><span class=\"math-tex\">$\\sqrt{25+144}=\\sqrt{169}=13$<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-10 01:14:38","option_type":"math","len":0},{"id":"7485","post_id":"7806","mon_id":"1159278","chapter_id":"1159327","question":"<p>K\u1ebft qu\u1ea3 ph&eacute;p t&iacute;nh&nbsp;<span class=\"math-tex\">$\\sqrt{0,4}.\\sqrt{6,4}$<\/span> l&agrave;:<\/p>","options":["<strong>A.<\/strong> 0,16","<strong>B.<\/strong> 0,06","<strong>C.<\/strong> 16","<strong>D.<\/strong> 1,6"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.<\/strong>&nbsp;1,6<\/span><\/p><p><span class=\"math-tex\">$\\sqrt{0,4}.\\sqrt{6,4}=\\sqrt{0,4.6,4}=\\sqrt{2,56}=1,6$<\/span><\/p>","type":"choose","extra_type":"shape2","time":"0","user_id":"127","test":"0","date":"2024-10-10 01:16:19","option_type":"txt","len":0}]}