求f(x)= 4x-2/2x+1 (x不等于负1/2)的反函数请写清解题步骤.另外请帮忙说明在写反函数类型题时有一步是求出原函数的值域,

f(x+1)+f(x-1)=2x²-4x,求f（x）? f(x+1)+f(x-1)=4x^3-2x求f(x) f(x)+f((x-1)/x)=2x; x!=0,1; 求f(x) f(x)+f[(x-1)/x]=2x x不等于0,1.求f(x). 二次函数f(x)满足f(x+1)+f(x-1)=2x^2+4x,求f(x) 数学f(x)=x(x+1)(x+2)(x+3)(x+4)(x+5),求f'(0)=? f(x)=x(x-1)(x+2)(x-3)(x+4)……(x+100),求f'(1) f(x)满足:2f(x)-f(1/x)=x+1,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(1/x)=3x,求f(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(-x)=-3x+1,求f(x) 已知f(x)满足f(x)+2f(1/x)=3x,求f(x) , 设2f(x)+xf(1/x)=(x+2x)/(x+1),求f(x). f(x)=(x^2-2x-1)/x (x>0)求f(x)最小值 设函数f(x)=(x-1)(x-2)...(x-100)(x>100),求F'(X) f(x)=x(x-1)(x-2)…(x-99)(x-100),求f'(100)