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我们知道,利用一元二次方程根与系数的关系,可以比较方便地求出一些二次方程两根对称式的值,而遇到一元二次方程两根非对称式值的求法,不少同学感到无从下手,现介绍几种常用的方法如下。
We know that using the relationship between the root and the coefficient of a quadratic equation, we can easily find two symmetry values of some quadratic equations. When we meet the quadratic equation with two unsymmetrical values, we have many students. I feel I have no way to start. Now I introduce several common methods as follows.