设全集等于1,2,3,4,5,6,7,8,9.A并集合的补集等1,3 、A交,B的补集等2,4 求B ? 就这样
人气：424 ℃ 时间：2019-09-01 08:34:46
解答
题目打错了吧,“A并集合”
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