题目

已知U={1,2,3,4,5,6,7,8},A={1,3,5,7},B={2,4,5},则= A.{6,8}                                B. {5,7}                        C. {4,6,7}                    D. {1,3,5,6,8} 答案：答案：A 解析：因为，故，所以选A.

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