深入探讨了常数变易法求解一阶非线性常微分方程和二阶非线性常微分方程，并将所探讨的结果进行系统地分析、比较、归纳和总结，给出了每种解法的特点和使用条件。%Discusses deeply the method of constant variationfor solvingthe first order nonlinearordinary differential equation and the second-order nonlinearordinary differential equation,explores the results by systematically analyze,compare and summary,and gives the characteristics and conditions of each method finally.
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