利用线性变换，统一给出常系数线性方程齐次通解和非齐次特解解构造定理的简化证明。
Using linear transform, the simple proof for solution of higher order linear differential equations was given.
利用常数变易法求解具有实特征根的四阶常系数非齐次线性微分方程，在无需求其特解及基本解组的情况下给出其通解公式，并举例验证公式的适用性。
Demonstrated in this paper is how the Constant-transform method, the typical method for solving differential equations of order one, is used in solving linear differential equations of order three.
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