换元法怎么解f(x+1)=x^2+4x+2,f(x).

f(x)=x(x-1)(x-2)(x-3)(x-4) f'(1)=? 二次函数f(x)满足f(x+1)+f(x-1)=2x^2+4x,求f(x) 画f(x)=x,f(x)=-2x+1,f(x)=2/x的图像,怎么画? f(X)=f(X+2)(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)=x/(x^2+1) 函数f(x)={(1/2)^x,(x>4),f(x+3),(x f(x)=4^x f-1(x)表示f(x)的反函数则f-1(2^x)=