己知全集为R,集合A=(-1,3],集合B=(0,4)求⑴A∪B,A∩B;⑵CA,CB.
人气：473 ℃ 时间：2019-08-19 08:33:27
解答
1.依然在数轴上画出A.B两个区间啦,
A∩B=(0,3]
A∪B=(-1,4)
2.CA是A的补集:
因为全集是R,A=(-1,3],出去A之外的其他实数就是A的补集啦
所以CA=(-∞,-1]∪(3,+∞)
同理:
CB=(-∞,0)∪[4,+∞)
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