题目

设集合U={1,2,3,4,5},A={1,2,3},B={2,3,4},则U(AB)=(A)｛2,3｝                    (B){1,4,5}                    (C){4,5}               (D){1,5} 答案：B  ∵A∩B={2,3},U={1,2,3,4,5},∴(A∩B)={1,4,5}.

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