f(3x+1)=x^2-2x,f(4)=?

f(x+1)+f(x-1)=4x^3-2x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) , 2f(x)+f(1/x)=3x-4,求f(x)的解析式 已知3f(x)+2f(1/x)=4x,求f(x) 3f(x)+2f(1/x)=4x,求f(x)的解析式 设f(x)满足3f(x)+2f(1/x)=4x,则f(x)=＿＿. 若函数f(x)满足3f(x)+2f(-1/x)=4x,求f(x) 已知f(x)满足2f(x)+3f(x分之1)=4x,求f(x) 已知f(x)满足:3f(x)+2f(1/x)=4x,求f(x) ① f(x)为一次函数,且f[f(x)]=1+4x,求f(x)② f(x)+2f（-x）=3x+x平方 ,求f(x)③ f(x)为一次函数,且f(x+1)+f(x-1)=2x平方-4x+4,求f(x)④ f(2x-1)定义域（-1,5],求f(2-5x)定义域,求f(x)定义域⑤ f(x)定义域[0,2] ,求f(x平方) 怎样由f(x+2)=1/f(x)得出f(x+4)=f(x) f(x)满足f(-x)+2f(x)=x+3,则f(1)等于 f(x)值域 [ 3/8，4/9] y=f(x)+√1-2f(x) f(1+1/x)=x/1-x^2 求f(x) f(1+x)+2f(1-x)=3x^2 求f(x)f(1+x)+2f(1-x)=3x^2求f(x)