已知抛物线
的焦点为
,
经过纵坐标为
的点
,且
平行于C的准线,则点
的横坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-12-29 17:17:29
|
【知识点】 根据抛物线上的点求标准方程
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【推荐1】以抛物线
的顶点为圆心的圆交
于
,
两点,交
的准线于
,
两点,已知
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b68f2ff04d213449516e1cc18cdde47.png)
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A.2 | B.4 | C.6 | D.8 |
您最近一年使用:0次
单选题
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较易
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名校
【推荐2】若抛物线
上的点
到其焦点的距离是点
到
轴距离的3倍,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc0d1e09d0675d011cd07018ace3bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
A.2 | B.4 | C.6 | D.8 |
您最近一年使用:0次