已知抛物线C的顶点在坐标原点O,焦点坐标为
,点P为直线
上任意一点,以P为圆心,PF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、E.
(1)求抛物线C的方程;
(2)请问直线DE是否过定点,若是求出该定点;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004cf3e8335136acc770de0c525cae47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73ecfaeac5db3976fe465b6f3ea977e.png)
(1)求抛物线C的方程;
(2)请问直线DE是否过定点,若是求出该定点;若不是,请说明理由.
更新时间:2023-02-13 20:05:28
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【推荐1】已知椭圆
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(1)求抛物线
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(3)求证:直线
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(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b881044b5c73db6fcce110525741b02.png)
(3)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】已知抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
的焦点为
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上运动,直线
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经过点
,且与
分别相切于
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(1)求
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(2)试问直线
是否过定点?若是,求出该定点坐标;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
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(1)求
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【推荐1】已知抛物线
,过定点
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,
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(1)求
,
两点的纵坐标之积,并证明
;
(2)过
作
的垂线
交该抛物线于
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.设线段
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【推荐2】抛物线
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