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待定系数法是一种重要的数学方法,它的基本思想是,先设定一个恒等式,其中含有一些尚待确定的系数,然后借助已知条件,构造以这些待定系数为未知数的方程或方程组,将待定系数求出来,从而得到所求的解.此方法的应用很广泛,最基本的是课本中提到的求一次函数、二次函数的解析式.除此之外,还有确定多项式中字母已知数的值、分解因式、分某一类分式为部分分式、用一个多项式的各次幂表示另一个多项式、解方程、求某
To be determined coefficient method is an important mathematical method, its basic idea is to first set up an identity, which contains some to be determined coefficient, and then with the known conditions, to construct these equations to be determined by the unknown or equations , The coefficient to be determined to find out, so as to obtain the required solution.This method is widely used, the most basic is mentioned in the textbook of the first order function, the quadratic function of analytic formula.In addition, there are deterministic polynomial In the letter has known the value of the factorization factor, a certain type of fractional part-fraction, with a power of a polynomial that another polynomial, solving equations, seeking a