全集U={1,2,3,4,5,6,7,8,9},A∩B={2},CuA∩CuB={1,9},CuA∩B={4,6,8},则A=?
人气:374 ℃ 时间:2019-10-23 03:33:35
解答
A={2,3,5,7},
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