所谓待定系数法,是指在求解某些具有特定形式的数学问题时,通过引入待定系数,依据题设建立等式(不等式),以确定待定系数的值(范围)的解题方法.这是一种司空见惯的数学方法,这种方法不仅贯穿了初等数学,而且也涵盖了高等数学.运用待定系数法解题,应当注意哪些方面的问题,本文对此拟结合实例,向同学们作出一些注解,以资参考. The so-called undetermined coefficient method refers to the method of solving the problem of determining the value (range) of the undetermined coefficient by introducing the undetermined coefficient and establishing equation (inequality) according to the problem when solving certain mathematical problems with certain forms. A common mathematical method, this method not only runs through the elementary mathematics, but also covers the higher mathematics .Use the coefficient method to be determined to solve problems, which aspects should be noted, this article intends to combine examples, to make some notes to the students To reference.