常微分方程中比较系数法的推广

Comparative Coefficient Popularization in Differential Equation

将求常系数微分方程特解的比较系数法，推广至一些特殊的变系数微分方程，并给出了证明和计算公式.

This article will focus on popularizing the comparative coefficient of special solutions in linear differential equations with constant coefficient to one in some linear differential equations with variable coefficient. Thus the solving process of these equations will be simplified. The solving formula and proof are given in the article.