已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则(A)∪(B)等于A.{1,6} B.{4,5} C.{2,3,4,5,7} D.{1,2,3,6,7} 题目和参考答案——青夏教育精英家教网—

题目内容

已知集合U={1,2,3,4,5,6,7},A={2,4,5,7},B={3,4,5},则(

A)∪(

B)等于( )

A.{1,6} B.{4,5} C.{2,3,4,5,7} D.{1,2,3,6,7}

思路解析:由题意可得A∩B={4,5}.

又(A)∪(B)= (A∩B),∴D正确.

答案:D

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A.{1,6} B.{4,5} C.{2,3,4,5,7} D.{1,2,3,6,7}

A.{1,6} B.{3} C.{2,3,4,5,7} D.{1,3,4,6,7}

已知集合U={1,2,3,4,5,6,7}, A={2,4,5,7},B={3,4,5},则(_uA)∪(_uB)=

(A){1,6} (B){4,5} (C){1,2,3,4,5,7} (D){1,2,3,6,7}

已知集合U={1,2,3,4,5,6,7}, A={2,4,5,7},B={3,4,5},则(_uA)∪(_uB)= .

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