The difficulty in decomposing rational function into partial fraction is to fix the undetermined coefficient in partial fraction.
将有理函数分解为部分分式的难点就是确定部分分式中的待定系数。
By using the undetermined coefficient method, a new scheme is derived from the HAUC2 scheme to simulate the two dimensional convection-diffusion equation.
运用待定系数法，建立了求解二维对流扩散方程的HAUC2格式。
The undetermined coefficient of the model is selected by using the orthogonal optimum seeking method, thereby the quantitative relation of the model is determined.
用正交优选方法优选模型中的待求系数，确定了模型的定量关系。
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