你画个数轴一目了然
MUN={x|x≤3}
(CuM)∩N=空
(CuM)U(CuN)={x|x>=1}
已知全集U=R,集合M={xIx≤3},N={xIx
已知全集U=R,集合M={xIx≤3},N={xIx
数学人气:663 ℃时间:2019-12-26 01:11:29
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