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若f-1(x)为函数f(x)=lg(x+1)的反函数,则f-1(x)的值域为 ....
若f-1(x)为函数f(x)=lg(x+1)的反函数,则f-1(x)的值域为 .
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在f
1(x)=
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,f
2(x)=x
2,f
3(x)=2
x,f
4(x)=
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x四个函数中,x
1>x
2>1时,能使
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;成立的函数是( )
A.f
1(x)=
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B.f
2(x)=x
2C.f
3(x)=2
xD.f
4(x)=
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函数f(x)=log
2|x|,g(x)=-x
2+2,则f(x)•g(x)的图象只可能是( )
A.
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B.
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C.
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D.
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设f
-1(x)是f(x)=log
2(x+1)的反函数,若[1+f
-1(a)][1+f
-1(b)]=8,则f(a+b)的值为( )
A.1
B.2
C.3
D.log
23
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函数y=log
2|ax-1|(a≠0)的对称轴方程是x=-2,那么a等于( )
A.
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B.-
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C.2
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若函数f(x)=log
ax(0<a<1)在区间[a,2a]上的最大值是最小值的3倍,则a等于( )
A.
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B.
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C.
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D.
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