f(x+1)=f(x)+1/x(x+1),x属于N*正整数且f(l)=3,求f(x)

f[f(x)]=4x-1 求f(x) f(x)-xf(-x)=1/x,求f(x) 设f(x)=lgx,证明f(x)+f(x+1)=f[x(x+1)] f(x)满足:2f(x)-f(1/x)=x+1,求f(x) 若f(x)满足f(x)-2f(1/x)=x,则f(x)=? 若F(x)满足f(x)+2f(1/x)=x,则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) f(x)=x2-4x+1,作出f(-x),-f(x),-f(-x)的图像 已知f(x)满足f(x)+2f(1/x)=3x,求f(x) , F[f-1(X)]=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). max{f(x),g(x)}=1/2(f(x)+g(x)+|f(x)-g(x)| 设f(x)= 1-x分之x 求f[(fx)]和f{f[f(x)]}