摘要：9．已知集合U={1,2,3,4,5,6,7}, A={2,4,5,7},B={3,4,5},则(uA)∪(uB)= {4,5} (C){1,2,3,4,5,7} (D){1,2,3,6,7} 解析:已知集合.(uA) ={1.3.6}.(uB) ={1.2.6.7}.则(uA)∪(uB)＝{1.2.3.6.7}.选D.

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