解题方法
1 . 已知抛物线
,
为抛物线C的焦点,点P为直线
上任意一点,以P为圆心,
为半径的圆与抛物线C的准线交于A,B两点,过A,B分别作准线的垂线交抛物线C于点
,D.且当点P的坐标是
时,线段
的中点是(1,
).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/0e662247-2ab6-4f75-b27e-f8a9c4729635.png?resizew=166)
(1)求抛物线C的方程;
(2)证明:直线
过定点,并求出定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b018f9658dfb68a30bd928e5d730045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e235d7dd12f948f5ffb2e5afddc95612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2234eabaa7f119a3624e6370fb82c1eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194be5d97d808a2c593caa1255bffc00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/0e662247-2ab6-4f75-b27e-f8a9c4729635.png?resizew=166)
(1)求抛物线C的方程;
(2)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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