已知全集U=R,集合M={x丨x≤3},N={x丨x<1},求m交n,(cum)并N,(cum)交（cun)

题目

已知全集U=R,集合M={x丨x≤3},N={x丨x<1},求m交n,(cum)并N,(cum)交（cun)
已知全集U=R,集合M={x丨x≤3},N={x丨x

答案

M∩N={X|x3} cun={x|x≥1}
(cum)并N={x|x3}
(cum)交（cun)={x|x>3}