{"common":{"save":0,"post_id":"7815","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"7795","post_id":"7815","mon_id":"1159278","chapter_id":"1159327","question":"<p>Ch\u1ecdn \u0111áp án \u0111úng.<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\sqrt{9}=\\pm3$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$\\sqrt{1,44}=-1,2$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\sqrt{\\dfrac{16}{9}}=\\dfrac{4}{3}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$\\sqrt{5^2-4^2}=5-4$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$\\sqrt{\\dfrac{16}{9}}=\\dfrac{4}{3}$<\/span>.<\/span><\/p><p><strong>A.<\/strong> <span class=\"math-tex\">$\\sqrt{9}=\\pm3$<\/span> sai, s\u1eeda l\u1ea1i là <span class=\"math-tex\">$\\sqrt{9}=3$<\/span>.<\/p><p><strong>B.<\/strong> <span class=\"math-tex\">$\\sqrt{1,44}=-1,2$<\/span> sai, s\u1eeda l\u1ea1i là <span class=\"math-tex\">$\\sqrt{1,44}=1,2$<\/span>.<\/p><p><strong>D.<\/strong> <span class=\"math-tex\">$\\sqrt{5^2-4^2}=5-4$<\/span> sai, s\u1eeda l\u1ea1i là <span class=\"math-tex\">$\\sqrt{5^2-4^2}=\\sqrt{25-16}=\\sqrt{9}=3$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-16 01:49:12","option_type":"math","len":0},{"id":"7796","post_id":"7815","mon_id":"1159278","chapter_id":"1159327","question":"<p>Ch\u1ecdn \u0111áp án \u0111úng.<\/p>","options":["<strong>A.<\/strong> C\u0103n b\u1eadc hai c\u1ee7a 0,81 là 0,9.","<strong>B.<\/strong> C\u0103n b\u1eadc hai c\u1ee7a 3,24 và –1,8.","<strong>C.<\/strong> C\u0103n b\u1eadc hai c\u1ee7a –225 là –15.","<strong>D.<\/strong> C\u0103n b\u1eadc hai c\u1ee7a 0,49 là <span class=\"math-tex\">$\\pm$<\/span>0,7."],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> C\u0103n b\u1eadc hai c\u1ee7a 0,49 là <span class=\"math-tex\">$\\pm$<\/span>0,7.<\/span><\/p><p>S\u1ed1 d\u01b0\u01a1ng A có \u0111úng hai c\u0103n b\u1eadc hai là hai s\u1ed1 \u0111\u1ed1i nhau \u0111ó là <span class=\"math-tex\">$\\sqrt{A}$<\/span> (s\u1ed1 d\u01b0\u01a1ng) và <span class=\"math-tex\">$-\\sqrt{A}$<\/span> (s\u1ed1 âm).<br \/>Vì v\u1eady các k\u1ebft lu\u1eadn <strong>A, B, C<\/strong> \u0111\u1ec1u sai.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-16 01:52:29","option_type":"math","len":0},{"id":"7798","post_id":"7815","mon_id":"1159278","chapter_id":"1159327","question":"<p>C\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a <span class=\"math-tex\">$\\dfrac{4}{9}$<\/span> là:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{2}{3}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$-\\dfrac{2}{3}$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$\\dfrac{3}{2}$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$-\\dfrac{3}{2}$<\/span>"],"correct":"1","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> <span class=\"math-tex\">$\\dfrac{2}{3}$<\/span>.<\/span><\/p><p>C\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a <span class=\"math-tex\">$\\dfrac{4}{9}$<\/span> là <span style=\"color:#16a085;\"><span class=\"math-tex\">$\\dfrac{2}{3}$<\/span>.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-10-16 01:56:11","option_type":"math","len":0}]}
