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}

解析：思路一:观察或用Venn图,得(A)∩(UB)={1,3,6}∩{1,2,6,7}={1,6}；思路二:观察或用Venn图,得A∪B={2,3,4,5,7}，则(A)∩(B)=(A∪B)={1,6}，故选A.

答案：A

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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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