解题方法
1 . 抛物线
的焦点为F,准线为
是抛物线上一点,过F的直线交抛物线于A,B两点,直线AP、BP分别交准线
于M、N.当
,点P恰好与原点O重合时,
的面积为4.
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726676338499584/2732237003841536/STEM/b716c866-c9f1-4356-8cc5-d73456cb7a6f.png?resizew=205)
(1)求抛物线C的方程;
(2)记
点的横坐标与AB中点的横坐标相等,若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df40ba57bb5819b4aaa38d514500052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ea803e31d2dedcf0590e0a0475e7ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0cc699a65e140dd4be6195f25c1e85d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33181b27b10690b4913595f8c1f46e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726676338499584/2732237003841536/STEM/b716c866-c9f1-4356-8cc5-d73456cb7a6f.png?resizew=205)
(1)求抛物线C的方程;
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe0bc8a9436bb738559b4aff7d4c721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8278a07eacf95a307186ba96fcb7b164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解题方法
2 . 已知
是坐标原点,圆
:
与
轴的左交点为
,动点
到圆心
的距离与到直线
的距离相等,动点
的轨迹为曲线
,直线
与曲线
相交于
,
两点.
(Ⅰ)若
经过点
,求
在
轴上的截距的取值范围;
(Ⅱ)当与坐标轴不垂直的直线
变化时,若总有
,则
是否定点?若过定点,求出该顶点;若不过定点,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a1b3c344d078f7d09f47aeb0be6b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(Ⅱ)当与坐标轴不垂直的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97efddfb9c132a50b74ed126c3cee56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解题方法
3 . 设圆D:
与抛物线C:
交于E,F两点,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb7aad3f2957f8beb69665aa1c60919.png)
(1)求抛物线C的方程;
(2)若直线l:
与抛物线C交于A,B两点
点A在第一象限
,动点
异于点A,
在抛物线C上,连接MB,过点A作
交抛物线C于点N,设直线AM与直线BN交于点P,当点P在直线l的左边时,求:
①点P的轨迹方程;
②
面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5a589fdbfd61132f773e457a221797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb7aad3f2957f8beb69665aa1c60919.png)
(1)求抛物线C的方程;
(2)若直线l:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb403a333c9e8fd9a3e7c100fb6017b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b554486bc34b098b4b3e878a2c4613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aca51d433190304dd9811b0a1f7b4beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c51b7b9dcf8c1b17609ae6999e46f6f.png)
①点P的轨迹方程;
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
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4 . 已知抛物线
的焦点F到准线的距离为2,O为坐标原点.
(1)求E的方程;
(2)已知点
,若E上存在一点P,使得
,求t的取值范围;
(3)过
的直线交E于A,B两点,过
的直线交E于A,C两点,B,C位于x轴的同侧,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c42d88e496a17562d25195301e0ac2.png)
(1)求E的方程;
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b312367cf51225ea3bfbee2103b0c30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec17f0a798a800ba556e21e2bb78d24b.png)
(3)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad3a4d8eb0a4f3dd417124a19f60066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd9be5d6b47dda528abe9b2bf6ff46d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
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