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若函数f(x)的定义域为[0,4],则函数f(x2)的定义域为( ) A.[0,...
若函数f(x)的定义域为[0,4],则函数f(x2)的定义域为( )
A.[0,2]
B.[0,16]
C.[-2,2]
D.[-2,0]
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已知集合A=[0,4],集合B=[0,2],按照对应法则f能建立从A到B的一个映射是( )
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B.f:x→y=x-2
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C.
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D.
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