全日制普通高级中学教科书(试验修订本)·数学(第二册(上))中讲述了一般椭圆的性质.本文则讨论一类特殊椭圆的性质,而这些性质在中学数学教学及解题过程中常会涉及到.为了下文表述的方便,我们给出规定:连接任一椭圆四个顶点的四边形是菱形,则称此菱形为“椭圆菱形”.如下图1所 The nature of general ellipses is described in full-time ordinary high school textbooks (trial revisions) and mathematics (second volumes (above)). This article discusses the properties of a special class of ellipses that are used in middle school mathematics teaching and problem solving. The Zhonghui meeting involves. For the convenience of the following statement, we provide that the quadrilateral connecting any four vertices of an ellipse is a rhombus, and this diamond is called an “elliptical diamond.”