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已知A=,则A的值构成的集合是( ) A.{1,-1,2,-2} B.{1,-1...
已知A=
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,则A的值构成的集合是( )
A.{1,-1,2,-2}
B.{1,-1}
C.{1,-1,0,2,-2}
D.{2,-2}
考点分析:
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