问题补充:
已知全集U={x∈N*|x<9},集合A={1,2,3,4,5,6},集合B={4,5,6},则(?UA)∪B等于A.?B.{7,8}C.{4,5,6}D.{4,5,6,7,8}
答案:
D
解析分析:由全集U及集合A求出A的补集,与B求出并集即可.
解答:∵全集U={x∈N*|x<9}={1,2,3,4,5,6,7,8},集合A={1,2,3,4,5,6},
∴?UA={7,8},
∵集合B={4,5,6},
∴(?UA)∪B={4,5,6,7,8}.
故选D
点评:此题考查了交、并、补集的混合运算,熟练掌握各自的定义是解本题的关键.