若f(1/1+x)=x+2/x+1,（1）求f(3)的值 （2）求f(1/x-1)的表达式拜托各位大神

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)= 若一次函数f(x) 满足f[f（x)]=1+2x 求f(x) 若函数f(x)满足f(x)+2f(1/x)=5x+4/x,则f(x)= f(x)={2x+1,x f(x)={1+x/2,x f(x)=(x-1)/(x+2) 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)| 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) , 若F(X-1/X)=X^2+1/X^2,求F(X-1)