以变化激活思维 以探索巩固旧知（To explore and solidify old knowledge by changing the thought of activation）.doc

以变化激活思维 以探索巩固旧知（To explore and solidify old knowledge by changing the thought of activation） Change the mind in order to explore the consolidation of old knowledge The teaching design of quadratic function resolution recitation Dong shufen, a senior middle school Textbook description: This is a recitation of the third chapter of the third chapter of the ninth grade algebra Textbook analysis: This class is the nature of quadratic function definition image after a small special class, the key to problem of quadratic function is quadratic function of the analytic type, strives for the quadratic function analytical solution is with the method of undetermined coefficients. Different known conditions for quadratic function, making use of the function properties can be set to general type, cross point and end point three analytic expression, including the general formula is a common method, and the cross point and end point has particularity. The use of the intersection point is the coordinate of the known parabola and the X-axis, which is more efficient at the point of the known parabola, the most value or vertex of the axis of symmetry. As the basis point and key point of solving quadratic function problem, it is very important to master quadratic analytical method. At the same time, it can consolidate the definition, image and property of quadratic function, improve the flexibility of problem solving, and enhance the system of knowledge. Student analysis: Through quadratic function definition, image, the nature of the study, students have mastered the basic knowledge of quadratic function, and the common problems strives for the type of the secondary function the circumstances under which a form which is lack of systematic understanding. Design concept: An important task of curriculum reform, change the study way, teach students to learn, to do this, change the traditional teacher summarize knowledge to students from already of knowledge reorganization, summing rules, s