对高阶方程d^nx/dt^n+a d^n-1x/dt^n-1+…+an.dx/dt+anx=c^n(Acoswt+Bsinwt),利用待定系数法和复数法得到了当不是特征根时特解的一般公式,并给出了详细推导过程和若干具体算例。
Based on the undetermined coefficient a nd complex number methods, this paper obtains he general formula of the special solution for the higher order ordinary differential equationd^nx/dt^n+a d^n-1x/dt^n-1+…+an.dx/dt+anx=c^n(Acoswt+Bsinwt) when the eigenvalue. The proofsdtn dtn dtnd practical examples are also given in detail.