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待定系数法是数学解题常用的方法之一.其实质是利用含待定系数(或参数)的一个恒等式(或恒等式组)的恒等性质,去解方程(或方程组),从而求出待定系数的值;或从方程组中消去这些待定的系
The undetermined coefficient method is one of the commonly used methods of mathematical problem solving. Its essence is to use the identity property of an identity (or identity) containing undetermined coefficients (or parameters) to solve equations (or equations), and thus to be determined. The value of the coefficient; or eliminating these pending systems from the system of equations