已知抛物线
的焦点为
,准线为
,
是
上一点,
是直线
与
的一个交点.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a6e38245884e637aa851f2345e829e.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1ba86ffc6e5542b62319848c14acaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17682ae0ac5fe7b5b5b1114ea0f053f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a6e38245884e637aa851f2345e829e.png)
更新时间:2021-08-12 14:18:51
|
【知识点】 抛物线的焦半径公式
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填空题-单空题
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适中
(0.65)
名校
解题方法
【推荐1】已知抛物线
的焦点为F,准线为
,点
在抛物线上,点
为
与
轴的交点,且
,过点
向抛物线作两条切线,切点分别为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/809a245e05e91a7e04f6e177033a29d0.png)
_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8f7b19469f057e0e055592bce42dce.png)
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您最近一年使用:0次
填空题-单空题
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适中
(0.65)
名校
解题方法
【推荐2】已知抛物线
的焦点为
,定点
,若直线
与抛物线
相交于
、
两点(点
在
、
中间),且与抛物线
的准线交于点
,若
,则
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97afdeaa1d4433cffe5005446fcbbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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