椭圆的第一定义如何推出第二定义（纯几何，不借助坐标系也不升到三维空间）？ 知乎 Sketch Coloring Page

椭圆的第一定义如何推出第二定义（纯几何，不借助坐标系也不升到三维空间）？ 知乎 Template

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