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1.问题提出学习圆锥曲线时,笔者对椭圆标准方程推导深感兴趣,因为笔者读高中时的教材到现在各种新课改版本教材推导方法都是耳热能详的颇为经典的“两次平方法”.偶然机会在整理资料时,见到一些期刊上有独特简便的推导方法,心里纳闷:教材的编写者为什么没有想到呢?带着兴趣和疑惑,笔者对这一问题进行深入研究,揣摩各种意图,妄自评论各种推导方法优劣之所在,求教于同行.2.问题探讨2.1对“两次平方法”具有代表性的评论
1. Problems When presenting learning conic curves, the author was deeply interested in the derivation of the elliptical standard equation, because the textbooks used in the reading of high school textbooks are now quite classic and classic. The sub-flat method ". Occasional opportunity to sort out the data, see some journals have a unique and simple deduction method, wondering: Why did not writers of textbooks think of it? With interest and confusion, the author deepen the issue Research, try to figure out various intents, comment on the advantages and disadvantages of various derivation methods, and ask for advice from peers. 2. Problem Discussion 2.1 A representative review of the “two-level method”