右焦点F2(2,0)到右准线的距离和它到短轴端点的距离相等,求椭圆的标准方程,
人气:148 ℃ 时间:2019-10-10 04:01:34
解答
右准线:x=a^2/c,右焦点坐标可得c=2,
右焦点到右准线距离是:a^2/c-2=a^2/2-2
右焦点到短轴端点的距离是a
所以:a^2/2-2=a解得a=1+根号5,
所以,a^2=6+2倍根号5,b^2=2+2倍根号5
标准方程你自己写出来吧.
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