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椭圆长轴长是什么
更新时间: 2020-10-23 00:00:00  

椭圆的长轴,是指椭圆上相距最远的两点之间的连线(线段)。

椭圆有一个特点:椭圆上任意一点分别到两个焦点的距离之和是不变的。

其实,这个“距离之和”就等于长轴的长度.半长轴的长度叫“a”,所以长轴的长度就是2a。

关键词: 椭圆 什么

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