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1 问题的背景 顶点是椭圆的一个十分简单的几何概念,对这一概念的教学,是一带而过、还是围绕顶点的几何特征引导学生展开探索?本文就此作一些阐述.
1 The background of the problem The vertex is a very simple geometric concept of an ellipse. The teaching of this concept is to lead the students to explore through the geometric features of the vertex or beyond. This paper makes some explanations.