1 . 已知抛物线C的顶点为原点,焦点F与圆
的圆心重合.
(1)求抛物线C的标准方程;
(2)设定点
,当P点在C上何处时,
的值最小,并求最小值及点P的坐标;
(3)若弦
过焦点
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffd767240a603ca0c0db5567707eb704.png)
(1)求抛物线C的标准方程;
(2)设定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8042f1b6b556402ac07fc69d92e21924.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2777de400b45fee1fb1262544d3fbcb.png)
(3)若弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5457baa379234afd6db167db272bf5d0.png)
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2018-07-03更新
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3卷引用:浙江省温州市苍南县金乡卫城中学2023-2024学年高二上学期10月检测数学试题