记函数f(x)=√(2-(x+3)/(x+1))的定义域为A,关于x的不等式ax^2-(a+1)x+1
问题描述:
记函数f(x)=√(2-(x+3)/(x+1))的定义域为A,关于x的不等式ax^2-(a+1)x+1
答
2-(x+3)/(x+1)>=0
(x-1)/(x+1)>=0
(x-1)(x+1)>=0
分母不等于0
x=1
B
(x-a-1)(x-2a)