试题与答案

已知集合A=[0,4],B=[0,2],按对应关系f不能构成从A到B的映射的是(

题型:选择题

题目:

已知集合A=[0,4],B=[0,2],按对应关系f不能构成从A到B的映射的是(  )
A.f:x→y=
1
2
x
B.f:x→y=x-2C.f:x→y=
x
D.f:x→y=|x-2|

答案:

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