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已知幂函数f(x)的图象经过点(27,3),则f(x)的解析式是 .
已知幂函数f(x)的图象经过点(27,3),则f(x)的解析式是 .
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定义运算:a⊙b=
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如1⊙2=1,则函数f(x)=2
x⊙2
-x的值域为( )
A.R
B.(0,+∞)
C.(0,1]
D.[1,+∞)
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已知0<a<1,b>1且ab>1,则下列不等式中成立的是( )
A.log
ab<
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<
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B.
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<log
ab<
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C.log
ab<
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<
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D.
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<
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<log
ab
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下列函数图象中,函数y=a
x(a>0且a≠1),与函数y=(1-a)x的图象只能是( )
A.
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B.
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C.
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D.
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已知函数f(x)=a
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B.a>1
C.0<a<1
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函数f(x)=2
|x|-1,使f(x)≤0成立的值的集合是( )
A.{x|x<0}
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D.{x|x=1}
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