已知实数x,y
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的最大值为
.
考点分析:
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关于x的方程x
2+(a+1)x+a+b+1=0(a≠0,a、b∈R)的两实根为x
1,x
2,若0<x
1<1<x
2<2,则
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的取值范围是( )
A.
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B.
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C.
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D.
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直线
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ax+by=1与圆x
2+y
2=1相交于A,B两点(其中a,b是实数),且△AOB是直角三角形(O是坐标原点),则点P(a,b)与点(0,1)之间距离的最大值为( )
A.
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+1
B.2
C.
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D.
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-1
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已知函数f(x)=log
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+
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的最小值为( )
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2-3a对任意实数x恒成立,则实数a的取值范围为( )
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C.[1,2]
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