f(x)=x(x+1)(x+2)...(x+2009),求f'(0)

已知2f(1/x)+f(x)=x(x不等于0),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(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)有定义,f(2x)=f(x)cos x,lim f(x)=f(0)=1(x趋于0时),求f(x) 若f(x)=e^x+2∫(0 1)f(x)dx 求f(x) f(x)连续且f(x)=x+(x^2)∫ (0,1)f(t)dt,求f(x) 若f(x)=2f(1/x)=2x+1/x,求f(x) f(x)=e^x/x,求∫f'(x)dx/1+f^2(x)? 已知f(x)+2f(-x)=x平方+x+1,求f(x)