韦达定理是初中代数中的一个重要定理,应用十分广泛.因而它是初中数学教学中应该重视而且必须解决好的一个问题,教师对此要有深刻的认识和广泛的理解。 一、重视初始教学,打好基础,准确用定理 韦达定理开始于一元二次方程一章,初始教学应本着正确理解、准确应用的要求去进行,不宜作过多的引伸,只要求学生掌握不解方程会求根的对称式的值,能熟练地求一 Weida Theorem is an important theorem in junior middle school algebra, and it is widely used. Therefore, it is a problem that should be considered in mathematics teaching in junior middle school and must be solved well. Teachers should have a profound understanding and a wide range of understanding. First, pay attention to the initial teaching, lay a good foundation, accurately use the theorem Weida Theorem began in the quadratic equation of one yuan, the initial teaching should be based on the correct understanding, accurate application requirements, not too much extension, only students Mastering the symmetry value of the incomprehensible equation rooting and skillfully seeking one