本文给出在中国分类之下二次微分系统有中心时两种情况的通积分。

We give general integral of quadratic differential system with center in two cases under the Chinese classification.

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本文对几类二阶非线性常微分方程，利用首次积分求得了其通积分公式。

This paper has found general integral formulas of some types of two - order nonlinear ordinary differential equations by first integral.

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借助变量代换、迭代等方法，提出几类新的高阶常微分方程，给出其相应的通积分公式。

By means of variable substitution and iterative method, this paper puts forth some new higher-order differential equations, and gives their formula of reduction of integrals to common denominator.

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