{"save":1,"level":1,"time":"60","total":25,"point":5,"segment":[{"id":"1457","test_id":"309","question":"<p>Trong kh&ocirc;ng gian <span class=\"math-tex\">$Oxyz$<\/span>, cho m\u1eb7t ph\u1eb3ng <span class=\"math-tex\">$\\left( P \\right):x+2y+3z-1=0$<\/span>.<\/p><p>Vect\u01a1 n&agrave;o d\u01b0\u1edbi \u0111&acirc;y l&agrave; m\u1ed9t vect\u01a1 ph&aacute;p tuy\u1ebfn c\u1ee7a <span class=\"math-tex\">$\\left( P \\right)$<\/span>?<br \/>&nbsp;<\/p>","options":["<span class=\"math-tex\">$\\overrightarrow{{{n}_{3}}}=\\left( 1;2;-1 \\right)$<\/span>","<span class=\"math-tex\">$\\overrightarrow{{{n}_{4}}}=\\left( 1;2;3 \\right)$<\/span>","<span class=\"math-tex\">$\\overrightarrow{{{n}_{1}}}=\\left( 1;3;-1 \\right)$<\/span>","<span class=\"math-tex\">$\\overrightarrow{{{n}_{2}}}=\\left( 2;3;-1 \\right)$<\/span>"],"correct":"2","answer":"<p>Ph\u01b0\u01a1ng tr&igrave;nh t\u1ed5ng qu&aacute;t c\u1ee7a m\u1eb7t ph\u1eb3ng c&oacute; d\u1ea1ng:<\/p><p><span class=\"math-tex\">$ax+by+cz+d=0$<\/span><\/p><p>V&eacute;c t\u01a1 ph&aacute;p tuy\u1ebfn&nbsp;<span class=\"math-tex\">$\\overrightarrow{n}=(a;b;c)$<\/span><\/p><p>&nbsp;<\/p>","type":"choose","user_id":"108","test":"0","date":"2020-04-07 10:41:30"},{"id":"1458","test_id":"309","question":"<p>V\u1edbi a&nbsp;l&agrave; s\u1ed1 th\u1ef1c d\u01b0\u01a1ng t&ugrave;y, <span class=\"math-tex\">${{\\log }_{5}}{{a}^{2}}$<\/span>&nbsp;b\u1eb1ng<br \/>&nbsp;<\/p>","options":["<span class=\"math-tex\">$2{{\\log }_{5}}a$<\/span>","<span class=\"math-tex\">$2+{{\\log }_{5}}a$<\/span>","<span class=\"math-tex\">$\\frac{1}{2}+{{\\log }_{5}}a$<\/span>","<span class=\"math-tex\">$\\frac{1}{2}{{\\log }_{5}}a$<\/span>"],"correct":"1","answer":"<p><span class=\"math-tex\">${{\\log }_{5}}{{a}^{2}}$<\/span>&nbsp;=&nbsp;<span class=\"math-tex\">$2{{\\log }_{5}}a$<\/span><\/p>","type":"choose","user_id":"108","test":"0","date":"2020-04-07 10:44:00"}]}