中文说明：
利用线性打靶法计算变系数的微分方程，并画图。
English Description：
The second- order differential equation with variable coefficient is solved by linear target method, and the content is detailed.
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中文说明：
利用线性打靶法计算变系数的微分方程，并画图。
English Description：
The second- order differential equation with variable coefficient is solved by linear target method, and the content is detailed.xianxingdabafa.m