With proper method of variable substitution, the soluble method to two kinds of inegrable equation of Riccati form is found, and the general integral expressions are given.
在一般教材中二重积分变量代换公式的证明通常采用几何的方法，也有部分数学分析教材给与了严格的分析证明，但证明不便直观的几何说明。
This paper points out the variable substitution method of triple integral of elliptical volume and examples its applications.
指出了椭球形区域上三重积分的一科变量替换方法，并说明了其应用。
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.
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。
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