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已知集合A={-1,1},B={x|mx=1},且A∪B=A,则m的值为( ) ...
已知集合A={-1,1},B={x|mx=1},且A∪B=A,则m的值为( )
A.1
B.-1
C.1或-1
D.1或-1或0
考点分析:
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