已知抛物线
的焦点为
,以点
为圆心的圆与直线
相切于点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/049cdb7561122405c1c302079593c987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4cb0990b93c9900bab2784bef4b10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfaba0309c471a4246ca3254a3cdaf17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
23-24高三上·天津河西·期末 查看更多[3]
更新时间:2024-01-18 12:54:27
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解题方法
【推荐1】写出与圆
和抛物线
都相切的一条直线的方程_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e34de63cddc3da92f3b47a57a33c99c5.png)
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【推荐2】点过直线
始终平分圆
的周长,则
的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4fcf308deb580c01fcf6936121dfcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed1988c5b91f206fb42d857e279269d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f0281e6bbdbe08beeccb55adf84536.png)
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【推荐1】过抛物线
的焦点
的直线交该抛物线于
,
两点,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58acf95344d6e5759cb2e05a6e61a151.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
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【推荐2】动圆P的圆心在抛物线
上运动,且保持与直线
相切,则动圆P经过定点的坐标为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b1183df9f26985febdc844cda75ed4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16dba1394505a6499e62e12a8c88560.png)
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