一个椭圆的两个焦点分别在一个直角三角形的两条直角边上，这个三角形的直角顶点为什么不能在椭圆边上？知乎 Sketch Coloring Page

一个椭圆的两个焦点分别在一个直角三角形的两条直角边上，这个三角形的直角顶点为什么不能在椭圆边上？知乎 Template

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