同学们都知道,一元二次方程有开平方法、配方法、公式法、因式分解法等四种解法。以前我最怕解大系数的一元二次方程,因式分解法不好用,公式法又易算错。学习了根与系数关系定理后,我找到了一种比较简单的方法,现举数例介绍如下。 The students all know that there are four kinds of solutions for the one-dimensional quadratic equation, such as Kaiping method, matching method, formula method, factorization method, and so on. In the past, I was most afraid of solving the quadratic equation with a large coefficient. The factorization method was not easy to use, and the formula method was easy to make mistakes. After learning the root and coefficient relationship theorem, I found a relatively simple method.