(1)若m>-3,则2m+1>m-2
则B集合为(m-2,2m+1)
因为B是A的子集
所以m-2>=-5,2m+1<=-2
so -3<=m<=-3/2
(2)若m=-3,则m-2=-5,2m+1=-5,则B为空集,成立
(3)若m所以m-2<=-5,2m+1>=-2
...
(1)若m>-3,则2m+1>m-2
则B集合为(m-2,2m+1)
因为B是A的子集
所以m-2>=-5,2m+1<=-2
so -3<=m<=-3/2
(2)若m=-3,则m-2=-5,2m+1=-5,则B为空集,成立
(3)若m所以m-2<=-5,2m+1>=-2
...