已知集合A={x|3≤x<6},B={x|2<x<9}.求CR(A∩B),(CRB)∪A.
人气:406 ℃ 时间:2020-04-14 14:10:19
解答
∵A∩B={x|3≤x<6}(2分)
∴CR(A∩B)=[x|x<3或x≥6}(4分)
∴CRB={x|x≤2或x≥9}(6分)
∴(CRB)∪A={x|x≤2或3≤x<6或x≥9}(8分)
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