设f(x)=(1+x)/(1-x),且f1(x)=f(x),fk+1=f(fk(x)),k=1,2,3...,则f2008(x)=

设f(x)满足f(x)+f'(x)+f(x)=e^x+2,且f(0)=1,f'(0)=0,求f(x) 已知f(x)=x^2+c,且f(f(x))=f(x+1),设g(x)=f(f(x)),求g(x)的解析表达式 设F(x)>0,F(0)=1,F‘(x)=f(x),且f(x)F(x)=sin^2(2x)(x>=0),求f(x).是F'（x)=f(x) 设f（x）为一次函数,且f（f(x)）=9x+1,则f(x)= 设f(x)=1/x(x 设f(x)=1-x,(x 设f(x)有二阶导数,且f''(X)>0,lim(x趋于0）f(x)/x=1 ..证明：当x>0时,有f(x)>x 设f(x)= 1-x分之x 求f[(fx)]和f{f[f(x)]} 设f(x)=1,且f(0)=0,则∫f(x)dx= 设f(x)=lgx,证明f(x)+f(x+1)=f[x(x+1)] 设函数f(x)满足f(x)+2f(1/x)=x,求f(x) 设函数f(x)满足f'(lnx)=1-x,且f(0)=0,求f(x) 设函数f'(x)=3x^2+x-1,且f(0)=0,求f(x)的表达式 设f(x)满足f(1/x)=x/1-x设设f(x)满足f(1/x)=x/1-x ,则f(x+1)=? 设函数f(x)定义域为R,且满足f(xy)=f(x)+f(y),则f(1/x)+f(x)=______ 设函数f(x)满足f(x+1)=2f(x)+x/2(x∈N+)且f(1)=2,则f(20)= 设函数f(x)在(-∞,+∞)可导,且满足f(0)=1,f'(x)=f(x),证明f(x)=e^x 设f (x)在x=0处可导,且f (0)=0,求证：lim(x→∞)f (tx)-f (x)/x=(t-1)f' (0)