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待定系数法解题的关键是依据已知,正确列出等式或方程。使用待定系数法,就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,转化为方程组来解决,要判断一个问题是否用待定系数法求解,主要是看所求解的数学问题是否具有某种确定的数学表达式,如果具有,就可以用待定系数法求解。例如分解因式、数列求和、求复数、解析几何中求曲线方程等,这些问题都具有确定的数学表达形式,所以都可以用待定系数法求解。使用待定系数法解题的基本步骤是:
The key to solve the problem of undetermined coefficient method is based on known, correctly listed equations or equations. The use of undetermined coefficient method is to have a certain form of mathematical problems, by introducing some to be determined coefficient, into equations to solve, to determine whether a problem to be undetermined coefficient method, mainly to see whether the mathematical problem solved Have certain mathematical expressions, if there is, you can use undetermined coefficient method to solve. For example, factoring, sequence summation, complex number, analytic geometry to find the curve equation, these questions have a certain mathematical expression, so they can be determined by the undetermined coefficient method. The use of undetermined coefficient method to solve the basic steps are: