借助于变量代换，求解几类线性微分方程，并得到了几个求解的充分必要条件。
With variable substitution, several kinds of linear differential equations are solved and several sufficient and necessary conditions are obtained.
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。
Based on variable substitution and the simplex method for linear programming, the paper also discusses the global optimization algorithm for the absolute value programming.
给出了代换盒的非线性度与其分量组合函数线性结构之间的密切联系。
Also, we formulate the nonlinearity by linear structures of its nonzero combination functions.
通过变量代换将问题中的两种耦合关系分解开，使得该问题转化为一个含有复杂约束条件的非线性规划问题。
The two different kinds of combined relations in this problem are de-coupled by variable replacing, and the problem is changed into a non-linear programming problem with complex constraints.
目的：研究变量代换对非线性生物模型回归参数的干扰，寻找消除或减少该干扰的新方法。
Objective: To study the disturbance creatd by the variable transformation within regression parameters of nonlinear biology models and find a new method removing or reducing the disturbance.
目的：研究变量代换对非线性生物模型回归参数的干扰，寻找消除或减少该干扰的新方法。
Objective: To study the disturbance creatd by the variable transformation within regression parameters of nonlinear biology models and find a new method removing or reducing the disturbance.
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