Question

已知集合A={x|x≤1或x≥3},B={x|m≤X≤m+1},全集U=R,求所有满足B含于CuA的m组成的集合

。。。急

Answer 1

CuA = R-A
= R - {x|x≤1 or x≥3}
= { x| 1<x<3 }
B is subset of CuA
then
m > 1 and m+1 < 3
m > 1 and m < 2

=> 1<m< 2 #