记函数f(x)=根号下[2-(x+3)/(x+1)]的定义域为A,不等式(x-a-1)(a-x)>0 (a∈R)的解集为B

问题描述:

记函数f(x)=根号下[2-(x+3)/(x+1)]的定义域为A,不等式(x-a-1)(a-x)>0 (a∈R)的解集为B
(1)求A
(2)若B?A,求实数a的取值范围

(1) 2-(x+3)/(x+1)>=0
(x+3)/(x+1)=1或x