题目内容
2.已知集合A={1,3,5,7,9},B={3,4,5},求:(1)A∪B,A∩B;
(2)若C={x|x∈A,且x∉B},求集合C.
分析 (1)由A与B,求出A与B的并集,A与B的交集即可;
(2)根据题意确定出C即可.
解答 解:(1)∵A={1,3,5,7,9},B={3,4,5},
∴A∪B={1,3,4,5,7,9},A∩B={3,5};
(2)∵C={x|x∈A,且x∉B},
∴C={1,7,9}.
点评 此题考查了交集及其运算,熟练掌握交集的定义是解本题的关键.
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