已知抛物线
,过焦点且倾斜角为
的直线交抛物线于
两点,以
为直径的圆与抛物线的准线相切,切点的纵坐标是
,则抛物线的准线方程为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
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更新时间:2020-12-11 19:51:35
|
【知识点】 根据抛物线方程求焦点或准线
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适中
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名校
解题方法
【推荐1】若抛物线
通径为
(其中M是第一象限点),当点
是
上的点时,则
的值等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca245f58924fdae9fb575a76ddaa70f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58ca94cf0e7541f0735c0094d414fc75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20347ddea302d7804a5380bd6eba1a6d.png)
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单选题
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适中
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解题方法
【推荐2】设抛物线
的焦点为
,点
是
的准线与
的对称轴的交点,点
在
上.若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f63236ebf785228b0141c044cde8c7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a150afbceeb1bc2302229bc95bdb9e.png)
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