椭圆的离心率是什么?
椭圆的离心率是什么?
数学人气:553 ℃时间:2020-04-05 18:50:43
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偏心率,离心率eccentricity离心率统一定义是动点到焦点的距离和动点到准线的距离之比.椭圆扁平程度的一种量度,离心率定义为椭圆两焦点间的距离和长轴长度的比值,用e表示,即e=c/a (c,半焦距;a,长半轴)椭圆的离心率可...
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