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一元二次方程是中学代数的重要组成部分,其内容包括一元二次方程的解法、一元二次方程根的判别式、韦达定理等.对一元二次方程解题训练能很好地培养学生的思维能力,是历届初中数学竞赛必考知识点之一.下面就选取一些有关一元二次方程求值题,对这部分内容作简单的剖析,以重难点为突破口,期望能在试题中感悟解题思路,达到触类旁通的效果.
The quadratic equation is an important part of the algebra of middle school, and its content includes the solution of the quadratic equation, the discriminant of the root of the quadratic equation, the Vedic theorem, etc. The training of the quadratic equation can well train the students Of thinking ability, is the junior high school mathematics contest will test the knowledge of one of the following to select some of the quadratic equation evaluation questions, this part of the content for a simple analysis to heavy and difficult as a breakthrough point, expect to be able to feel in the test questions Problem-solving ideas to achieve the effect of analogy bypassed.