摘要
常数变易法是求解常微分方程比较重要的一种。本文通过求解一阶线性非齐次微分方程的例子对常数变易法进行探讨，进而揭示常数变易法的实质。
Constant variation method is one of the more important methods to solve the differential equation.We study constant variation method through solving inhomogeneous linear differential equations, and then revealing the essence of this method.
基金
国家自然科学基金（No.11301573）.
关键词
常数变易法
微分方程
TVariation of constants method ： ODE
