x as a function of time, and when you have the correct solution x and you substitute that back into that differential equation, that equation will have to be satisfied.
根据时间的变化，x，is，，of，course，，changing，in，some，way,发生相应的变化，当你得到了,和时间的正确关系，for，x，as，a，function，of，time,你把它代入,这个微分方程，这个等式，就能得到满足。
The sum formulas of several kinds of ordinary series with function term are deduced by using the method of solving linear differential equation.
本文试应用求解一阶线性微分方程的方法导出几类常见的函数项级数的求和公式。
For example, the solution of a differential equation is a function.
例如，这个解决方案的微分方程是一个功能。
应用推荐