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待定系数法的基本思想,是把具有某种确定形式的数学问题,通过引入一些待定的系数,利用命题恒成立的条件,列出关于这些系数的方程组,解方程组求出相应系数的值,从而使问题得到解决．
The basic idea of the undetermined coefficient method is to list the equations about these coefficients by introducing some undetermined coefficients and using the propositional constants to establish the equations. Solving the equations to find the values of the corresponding coefficients So that the problem can be solved.