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圆锥曲线的离心率问题是高考的热点,学生在做这类题目时往往难以找到突破口或者是因运算量大难以坚持到最后.在教学中,要引导学生根据圆锥曲线的定义、勾股定理、三角形相似等列出a,b,c的关系式,最后化到只含a,c的关系式,即可求出圆锥曲线的离心率.本文中,笔者通过对两道2016年高考试题的解析、变式与推广来思考如何解决圆锥曲线的离心率问题.一、2016年高考山东卷第13题的解析、变式与
Conic eccentricity problem is a hot college entrance examination, students are often difficult to find a breakthrough in such topics or because of the large amount of computation difficult to persist to the end.In teaching, to guide students according to the definition of conic curve, Pythagorean theorem, Triangular similar to the list of a, b, c relationship, and finally to only contain a, c of the relationship, you can find the conic curve of the centrifugal rate.This article, I passed two 2016 college entrance examination test analysis , Variants and promotion to think about how to solve the conic curve of the centrifugal rate.First, in 2016 Shandong University Entrance Examination Thirteenth Analysis, Variants and