求\(\,f(\ge 0)\,\)连续且\(\displaystyle\int_0^xf(t)dt\ge |f(x)|\;(x\in[0,1])\)

elim

求连续函数\(\,f=|f|\,\)使\(\displaystyle\int_{0}^{x}f(t)dt \ge |f(x)|, \forall x \in [0,1]\)

xfhaoym

好象是e^(-x)?