Toán lớp 12 - Đề kiểm tra 45 phút - Toán lớp 12 - Tháng 1 - Số 2

{"save":1,"level":1,"time":"45","total":20,"point":5,"segment":[{"id":"436","test_id":"250","question":"<p>G\u1ecdi&nbsp;<span class=\"math-tex\">$z_{1},z_{2}$<\/span>&nbsp;l&agrave; nghi\u1ec7m c\u1ee7a ph\u01b0\u01a1ng tr&igrave;nh&nbsp;<span class=\"math-tex\">${{z}^{2}}-3z+5=0$<\/span>&nbsp;. T&iacute;nh&nbsp;<span class=\"math-tex\">$\\left| {{z}_{1}} \\right|+\\left| {{z}_{2}} \\right|$<\/span><\/p><p>&nbsp;<\/p>","options":["<span class=\"math-tex\">$2\\sqrt{5}$<\/span>","3","<span class=\"math-tex\">$\\sqrt{5}$<\/span>","10"],"correct":"1","answer":"<p><span class=\"math-tex\">${{z}^{2}}-3z+5=0$<\/span><\/p><p><span class=\"math-tex\">$\\Leftrightarrow$<\/span>&nbsp;<span class=\"math-tex\">$\\begin{cases}z_{1}=\\frac{3}{2}-\\frac{\\sqrt{11}i}{2} & \\\\z_{1}=\\frac{3}{2}+\\frac{\\sqrt{11}i}{2} &\\end{cases}$<\/span><\/p><p><span class=\"math-tex\">$\\left| {{z}_{1}} \\right|+\\left| {{z}_{2}} \\right|=2\\sqrt{{{\\left( \\frac{3}{2} \\right)}^{2}}+{{\\left( \\frac{\\sqrt{11}}{2} \\right)}^{2}}}=2\\sqrt{5}$<\/span>&nbsp;<\/p>","type":"choose","user_id":"108","test":"2","date":"2020-03-18 11:30:38"},{"id":"437","test_id":"250","question":"<p>T&igrave;m a, b th\u1ecfa m&atilde;n :&nbsp;2a+(b+i)i=1+2i<\/p><p>&nbsp;<\/p>","options":["<span class=\"math-tex\">$a = 0,b = 2$<\/span>","<span class=\"math-tex\">$a=\\frac{1}{2},b=1$<\/span>","<span class=\"math-tex\">$a=0,b=1$<\/span>","<span class=\"math-tex\">$a=1,b=2$<\/span>"],"correct":"4","answer":"<p><span class=\"math-tex\">$2a+(b+i)i=1+2i \u27fa (2a-1)+bi=1+2i$<\/span><br \/>\u27fa <span class=\"math-tex\">$\\left\\{ \\begin{align}\\n\u00a0 & a=1 \\\\\u00a0\\n\u00a0& b=2 \\\\\u00a0\\n\\end{align} \\right.$<\/span><\/p><p>&nbsp;<\/p>","type":"choose","user_id":"108","test":"0","date":"2020-03-18 11:33:47"}]}