设集合A={4,5,6,9}.B={3,4,7,8,9},全集U=A∪B,则集合Cu(A∩B)中的元素个数是
2个回答
U={3,4,5,6,7,8,9,}
A∩B={4,9}
Cu(A∩B)={3,5,6,7,8}
正确
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