已知抛物线
上一点
到其焦点的距离为
,则点
到
轴的距离为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
更新时间:2019-02-02 16:10:00
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【知识点】 抛物线上的点到定点的距离及最值
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【推荐1】希腊著名数学家阿波罗尼斯与欧几里得、阿基米德齐名他发现:“平面内到两个定点
的距离之比为定值
的点的轨迹是圆”.后来,人们将这个圆以他的名字命名,称为阿波罗尼斯圆,简称阿氏圆.已知在平面直角坐标系
中,
,
,点
是满足
的阿氏圆上的任一点,则该阿氏圆的方程为___________________ ;若点
为抛物线
上的动点,
在
轴上的射影为
,则
的最小值为______ .
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【推荐2】已知抛物线
的焦点为
为
上一点,若
,当
最大时点
的坐标为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1ba86ffc6e5542b62319848c14acaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d945b17623cd01fa90180c4d4fca91f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd99c5000629d7f49499d666e68f40d.png)
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