Posted by haifeng on 2019-07-12 16:42:56 last update 2019-07-12 16:42:56 | Answers (1) | 收藏
求二阶常系数线性齐次方程
\[ \begin{cases} y''+2y'+y=0,\\ y(0)=4,\quad y'(0)=-2 \end{cases} \]
