...再按照前提列出方程或者方程组，求出未知系数，从而获患上所求成果的要领，叫做待定系数法(method of undetermined coefficient).
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In general, special solution of non-homogeneous linear equation of constant coefficient of the second order is obtained by the method of undetermined coefficient, but it's process is too complicated.
二阶常系数非齐次线性微分方程的特解一般都是用“待定系数”法求得的，但求解过程都比较繁琐。
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