为什么平面内椭圆上一个动点到两个定点的距离之和等于常数且大于两个定点的距离？ 知乎 Sketch Coloring Page

为什么平面内椭圆上一个动点到两个定点的距离之和等于常数且大于两个定点的距离？ 知乎 Template

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