题目内容
13、设全集U=A∪B={x∈N*|lgx<1},若A∩?UB={m|m=2n+1,n=0,1,2,3,4},则集合B=
{2,4,6,8}
.分析:解对数不等式得全集,结合A∩?UB得集合?UB,从而求得B.
解答:解:∵U=A∪B={1,2,3,4,5,6,7,8,9}
又∵A∩?UB={1,3,5,7,9},
∴?UB={1,3,5,7,9},
∴B={2,4,6,8},
故填:{2,4,6,8}.
又∵A∩?UB={1,3,5,7,9},
∴?UB={1,3,5,7,9},
∴B={2,4,6,8},
故填:{2,4,6,8}.
点评:题属于以不等式为依托,考查集合的交集、补集的基础题,也是高考常会考的题型.
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