高三数学讲评课是高三复习课的重要形式,是对知识的再归纳、整理、提升的过程.在讲评课中,既要注重学生知识上的查漏补缺,同时还要在一定的高度对知识进行前后联系,深化数学思想和解题方法,做到对知识的灵活运用.那么怎样才能上好一节讲评课呢?本文以一道圆锥曲线试题为例,谈谈如何使讲评课层层深入,提高讲评课的效率.题目已知抛物线C:x2=4y,设D是抛物线C的准线l上任意一点,过点D向抛物线 Senior high school mathematics commentary class is an important form of senior high school review class, is the process of re-induction, collation, improvement of knowledge.In the commentary class, it is necessary to focus on student knowledge on the leak, but also at a certain height of knowledge How to make a good comment on the lesson? This paper takes a conical question as an example, talk about how to make layers of assessment, Improve the efficiency of lectures class topic known parabola C: x2 = 4y, let D is the quasi-line parabola C at any point, point D to the parabola