设f"(x)

设f(x) 设F(X)在a 设f（x）等于x x 设f(x)={█( x ,x 设f(x)=1/x(x 设f(x)=1-x,(x 设f(x)=x2+x(x 设f(x){e^(1/x),x 设f(x)=x(x 设f(x)= 1-x分之x 求f[(fx)]和f{f[f(x)]} 设f(x)={1+x (-1 设f(x)={1+x (-1 设函数f(x)={ex,x 设f(x)={sinx,x 设函数f(x)={ex,x 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)满足f(x)+2f(1/x)=x,求f(x) 设f(x)=lgx,证明f(x)+f(x+1)=f[x(x+1)]