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在求解函数的解析式时,先设出待求函数关系式(其中含有未知的系数),再根据题目中所给的条件列出关于未知系数的方程或方程组,求出未知系数,从而得到函数的关系式的方法,叫做待定系数法.利用待定系数法解决问题常用以下步骤:1.设出所求问题含有待定系数的解析式;2.根据题目中所给的条件,列出一组以待定系数为未知数的方程;
In resolving the analytic function, we first set out the relationship between the function to be sought (which contains unknown coefficients), and then according to the conditions given in the title list of equations or equations about unknown coefficients, to find the unknown coefficients, resulting in The function of the relationship between the method, is called pending coefficient method .Using undetermined coefficient method to solve the problem commonly used in the following steps: 1 to set the desired problem contains the coefficient to be determined analytic formula; 2 according to the conditions given in the title, The equation to be determined is unknowns;