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。
Based on variable substitution and the simplex method for linear programming, the paper also discusses the global optimization algorithm for the absolute value programming.
同时，引入变量代换，基于线性规划的单纯形法，提出该类绝对值规划问题的全局优化求解算法。
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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