设函数f(x)=√2-(x+3)/x+1,的定义域为A,g(x)=lg(x-a-1)(2a-x)[a<1]的定义域为B.求①:求A;②:若B?A,求a的范围.
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![设函数f(x)=√2-(x+3)/x+1,的定义域为A,g(x)=lg(x-a-1)(2a-x)[a<1]的定义域为B.求①:求A;②:若B?A,求a的范围.](/uploads/image/z/4522592-56-2.jpg?t=%E8%AE%BE%E5%87%BD%E6%95%B0f%28x%29%3D%E2%88%9A2-%EF%BC%88x%2B3%EF%BC%89%2Fx%2B1%2C%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BAA%2Cg%28x%29%3Dlg%28x-a-1%29%282a-x%29%5Ba%EF%BC%9C1%5D%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BAB.%E6%B1%82%E2%91%A0%EF%BC%9A%E6%B1%82A%EF%BC%9B%E2%91%A1%EF%BC%9A%E8%8B%A5B%3FA%2C%E6%B1%82a%E7%9A%84%E8%8C%83%E5%9B%B4.)
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设函数f(x)=√2-(x+3)/x+1,的定义域为A,g(x)=lg(x-a-1)(2a-x)[a<1]的定义域为B.求①:求A;②:若B?A,求a的范围.
设函数f(x)=√2-(x+3)/x+1,的定义域为A,g(x)=lg(x-a-1)(2a-x)[a<1]的定义域为B.
求①:求A;②:若B?A,求a的范围.
设函数f(x)=√2-(x+3)/x+1,的定义域为A,g(x)=lg(x-a-1)(2a-x)[a<1]的定义域为B.求①:求A;②:若B?A,求a的范围.
1.
2-(x+3)/(x+1)>=0
(2x+2-x-3)/(x+1)>=0
(x-1)(x+1)>=0
x+1在分母,不等于0
所以A={x|x>=1,x0
[x-(a+1)](x-2a)