题目内容
A.{1} B.{1,2}
C.{2} D.{0,1,2}
D
解析:I={-2,-1,0,1,2},IB={0,1},
∴A∪IB={0,1,2}.
设集合,则=( )
A. B. C. D.R
设集合,则=
设集合,则=__________.