The general reduced gradient method is used to find the solution of the mathematical model, and the calculation process is discussed.

采用广义简约梯度法求解此数学模型，探讨了其计算过程。

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Based on this macroscopic model, reduced gradient method was applied to search for the optimal working conditions of pumping stations.

在此宏观模型的基础上，利用简约梯度法推求各供水泵站优化的工况点。

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The difference coefficient was used to replace the exact derivative which is difficult to be computed, and a new algorithm was presented by using the idea of reduced gradient method.

利用差商代替难以计算的精确导数，结合既约梯度法的思想建立新的算法；在目标函数一致凸的条件下证明了既约差商法的整体收敛性。

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