二,集合A={—1,1},集合B={X丨lXl=1}则A与B有何关系？

Question

答案

Answer 1

A={xl-1≤x≤3}
B={xlm-2≤x≤m+2 ,m∈R}
AUB =A
=> B is subset of A
-1≤m-2 and m+2≤3
m≥1 and m≤1
=> m=1本回答被网友采纳