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下列函数中,在区间(0,+∞)上是减函数的是( ) A.y=-x2+2 B.y=...
下列函数中,在区间(0,+∞)上是减函数的是( )
A.y=-x2+2
B.y=x3
C.y=2-x+1
D.y=log2
考点分析:
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下列四个图形中,不是以x为自变量的函数的图象是( )
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