一、教学内容人教版数学九年级上册40～41页,一元二次方程的根与系数的关系.二、教学目标1.理解一元二次方程根与系数关系的含义;会推理一元二次方程根与系数关系;2.会用一元二次方程根与系数关系求一元二次方程两根的和与积,求由一元二次方程的两根组成的代数式的值,求一元二次方程中的待定系数,能运用它由一元二次方程的一个根求出另一个根;3.引导学生经历探究一元二次方程根与系数关系的过程,体验一元二次方程根与系数关系产生的原因、探究的过程及其运用的方法.4.培养学生提出问题和解决问题的能力,以及从 First, the teaching content PEP mathematics ninth grade 40 ~ 41 pages, the root of a quadratic equation and the coefficient relationship. Second, the teaching objectives 1. Understand the meaning of the relationship between the root of a dollar quadratic equation and the coefficient; Equation root and coefficient relationship; 2 will be the root of the quadratic equation and the relationship between the coefficient of the two quadratic equation and quadratic product, find the two elements of a quadratic equation of the algebraic value, seeking a quadratic equation In the undetermined coefficient, we can use it to find a root from one root of the quadratic equation; 3. Guide the students to experience the process of exploring the relationship between the root of the quadratic equation and the coefficient, and experience the relationship between the root of the quadratic equation and the coefficient The reason, the process of inquiry and the method of its application.4.Great students' ability to ask questions and solve problems,