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f(2)=2/(2a+b)=1 ∴2a+b=2 f(x)=x,即x/(ax+b)=x,即x(ax+b-1)=0,∴x=(b-1)/(-a)=0 ∴b=1 ∴a=1/2 ∴f(x)=x/(1/2x+1)=2x/(x+2)
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