f(x)=(2x-2)/(x²+1)

1.f(x)=1-x² 2.f(x)=-3x+1 3.f(x)=2/x 4.f(x)=(x-x²)/ f(x)=x/(x^2+1) f(x+1/x)=(x+1/x)²-2,用配凑法求f（x） 已知函数f(x)=x²+x+1,x≥0；2x+1,x 已知x∈r,f(x)+2f(1-x)=x²+x,求y=f(x) 2f(x)+x^2f(1/x)=(3x³-x²+4x+3)/(x+1) 2x²f(1/x) F(X)满足F(x)+2f(x分之1)=3X,求f(x) 已知f(x)满足2f(x)+f(1/x)=3x,求f(x) 已知f(x)满足2f(x)+f(1/x)=3x,求f(x)? 设函数f(x)满足f(x)+2f(1/x)=x,求f(x) 已知f(x)满足2f(x)+f(-x)=-3x+1,求f(x) f(X)=f(X+2)(x