change of variable meaning in Chinese

变量变换
变数的更换
换元；变量的换

We shall now show that the change of variable formula for integrals is just as unforgettable .
我们现在来说明积分的换元公式也一样好记。
Change of variables for general formula of non - homogeneous linear recursive sequence with constant coefficients
常系数非齐次线性递归数列通项公式计算的通项变换法
This thesis also shows the problem in the course of state - owned enterprises property right institution renovation through the changing of variables in the model
文章还通过模型中变量的改变刻画了我国国有企业的产权制度变迁路线，点明了问题所在。
The numerical methods utilized in solving the set of mathematical equations involve calculating the spatial rate of change of variables , which means a priori grid point value information along the boundary outside the model domain has to be separately provided to set up time - dependent boundary conditions for computing the governing equations
：计算有关数学方程组的数值方法，牵涉到变数在空间的分布变化，故此亦需要另外提供模式范围以外的网格点值，从而按时间设定边界条件，以完成基本方程组的运算。