设全集为实数集R,M={x|x≤1+2,x∈R},N={1,2,3,4},则CRM∩N=(  ) A.{4} B.{3,4} C.{2,3,4} D.{1,2,3,4}

问题描述:

设全集为实数集R,M={x|x≤1+

2
,x∈R},N={1,2,3,4},则CRM∩N=(  )
A. {4}
B. {3,4}
C. {2,3,4}
D. {1,2,3,4}

由集合M={x|x≤1+

2
,x∈R},全集为实数R,
得到CRM={x|x>1+
2
},又集合N={1,2,3,4},
则CRM∩N={3,4}.
故选B