10.(2023春•唐山期末)已知函数f(x)=ex−ax−1f(x)=e^{x}-ax-1f(x)=ex−ax−1.(1)讨论函数f(x)f(x)f(x)的单调性;(2)若f(x)f(x)f(x)有且仅有2个零点,求实数aaa的取值范围.