Question

集合A={-2≤x≤5},区间B={m+1,2m-1},若B∪A=A,则实数m的取值范围为多少?

Answer 1

if B∪A=A

=> B is subset of A

case 1:if B不是空集

ie 2m-1> m+1

m > 2

B is subset of A

=> m+1> -2 and 2m-1 m > -3 and m