函数f(x)在0到无穷上可导,f(0)=1,且满足等式f'(x)+f(x)-1/(x+1)[0,x]∫f(t)dt=0 (1)求f'(x)(2)证明当x>=0时,不等式e^-x

问题描述:

函数f(x)在0到无穷上可导,f(0)=1,且满足等式f'(x)+f(x)-1/(x+1)[0,x]∫f(t)dt=0 (1)求f'(x)
(2)证明当x>=0时,不等式e^-x