设A={-2≤x ≤a,0

题目

设A={-2≤x ≤a,0

答案

-2<=x<=a
0所以0²<=x²<=2²
所以C={z|0<=z<=4}
-2<=x<=a
-1<=2x+3<=2a+3
B={y|-1<=y<=2a+3}
C⊆B
所以2a+3>=4
所以a>=1/2