f(x)=根号下x-1/x+1的定义域为A,所以x-1/x+1>=0,x>=1或x=1或x1或x1或x1或x=1或x=-1
记函数f(x)=根号下x-1/x+1的定义域为A,g(x)=lg(x-a)(x-1) 其中a
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