25．（2023春•江油市校级期末）已知函数$f(x)=e^{x}+ax-3(a\in R)$，若对于任意的$x_{1}$，$x_{2}\in [1$，$+\infty )$且$x_{1}<x_{2}$，都有$x_{2}f(x_{1})-x_{1}f(x_{2})<a(x_{1}-x_{2})$成立，则$a$的取值范围是 ___$(-\infty$[，]$3]$___．