已知圆锥曲线C经过定点P(3,
),它的一个焦点为F(1,0),对应于该焦点的准线为x=-1,斜率为2的直线
交圆锥曲线C于A、B两点,且 AB =
,求圆锥曲线C和直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6e3068d45760efcd652868d4fdc325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d52429c8324350309f77e7209a5c35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6e3068d45760efcd652868d4fdc325.png)
更新时间:2019-01-02 16:21:16
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【推荐1】(Ⅰ)抛物线的顶点在原点,坐标轴为对称轴,并经过点
,求此抛物线的方程.
(Ⅱ)已知圆:
(
),把圆上的各点纵坐标不变,横坐标伸长到原来的
倍得一椭圆.求椭圆方程,并证明椭圆离心率是与
无关的常数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868006292482afc073287dcb56b85c1f.png)
(Ⅱ)已知圆:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26edd7d076460e7aa7e8f319cb2be370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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【推荐2】已知椭圆
,其上焦点
与抛物线
的焦点重合.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/e2c5f3a9-17a0-44c2-96b4-855e0bd06ffa.png?resizew=311)
(1)求抛物线
的方程;
(2)若过点
的直线交椭圆
于点
,同时交抛物线
于点
(如图1所示,点
在椭圆与抛物线第一象限交点上方),试证明:
;
(3)若过点
的直线交椭圆
于点
,过点
与直线
垂直的直线
交抛物线
于点
(如图2所示),试求四边形
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7eab4dd2a8332424ab484b069d4be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1bff67569573ed92364b5c66882a772.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/e2c5f3a9-17a0-44c2-96b4-855e0bd06ffa.png?resizew=311)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
(2)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ebaa32f4f1f4f807ca9aeb7fb29951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6114947179bed8c2c86ac078e2f8497f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/688c093797513dfde101482955103547.png)
(3)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ebaa32f4f1f4f807ca9aeb7fb29951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f48190fdbfc32aa8b13910e77a1b443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87391c2b154b302f4bf939035f59b99c.png)
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解答题-问答题
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解题方法
【推荐1】已知F为抛物线
的焦点,点
为抛物线C内一定点,点P为抛物线C上一动点,且
的最小值为8.
(1)求抛物线C的方程;
(2)若直线
与抛物线C交于
、
两点,求BD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e18e9b80fdeaa8bd3cf97b3c214448f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508734095955bb96d52f37be4e681700.png)
(1)求抛物线C的方程;
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5428b040be21dcd503d350478c0a4773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe197f95a36f68ee80f69ff5f4a26970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8f4b9801bfe085794e3d1694fa6aa7.png)
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【推荐2】已知抛物线E:
的焦点为F,点
在抛物线E上,且
的面积为
(O为坐标原点).
(1)求抛物线E的方程;
(2)过焦点F的直线l与抛物线E交于A、B两点,过A、B分别作垂直于l的直线AC、BD,分别交抛物线于C、D两点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4af1560bfd68fa9e4e82093d327ab7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c3b743769d19231c2165ec275bab1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186c88482022ce0b88ab67b9897e6736.png)
(1)求抛物线E的方程;
(2)过焦点F的直线l与抛物线E交于A、B两点,过A、B分别作垂直于l的直线AC、BD,分别交抛物线于C、D两点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c761dad84bd29109dc0ffc31b9cbbd46.png)
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