填空题: {1,2,3,4}∩亅{3,4,5,6}=_____, {1,2,3,4}∪{3,4填空题:{1,2,3,4}∩亅{3,4,5,6}=_____,{1,2,3,4}∪{3,4,5,6} =______________,A∩CuA = ___________ .谢谢!
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