1 . 抛物线的弦与在弦两端点处的切线所围成的三角形被称为“阿基米德三角形”.对于抛物线C:
给出如下三个条件:①焦点为
;②准线为
;③与直线
相交所得弦长为2.
(1)从以上三个条件中选择一个,求抛物线C的方程;
(2)已知
是(1)中抛物线的“阿基米德三角形”,点Q是抛物线C在弦AB两端点处的两条切线的交点,若点Q恰在此抛物线的准线上,试判断直线AB是否过定点?如果是,求出定点坐标;如果不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004cf3e8335136acc770de0c525cae47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb70fdf064b9193e506ca43f4672af56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3397d5c5786431a89d2a617766ca92f2.png)
(1)从以上三个条件中选择一个,求抛物线C的方程;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
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解题方法
2 . 已知抛物线
与椭圆
存在相同的焦点,第一象限内曲线
上的一点
到其焦点的距离为2,直线
与
相交于
两点(不与
点重合),直线
,
关于直线
对称.
(1)求证:直线
的斜率为定值;
(2)若椭圆
上存在不同的两点关于直线
对称,求原点到直线
距离的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f80080fac68745fe783b879cccb6140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9724fd240c60553bffc050d502e9a18a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751b1b0a7043f66ae805a8b473e4a7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解题方法
3 . 如图,已知点
在半圆
:
上一点,过点P作抛物线C:
的两条切线,切点分别为A,B,直线AP,BP,AB分别与x轴交于点M,N,T,记
的面积为
,
的面积为
.
![](https://img.xkw.com/dksih/QBM/2022/2/16/2917780834074624/2918913037582336/STEM/69b2636d-dd93-4c06-b114-72d6a5764755.png?resizew=182)
(1)若抛物线C的焦点坐标为(0,2),求p的值和抛物线C的准线方程:
(2)若存在点P,使得
,求p的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2c1a1c868218dd0be4e77ca9cfe84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c2f156b05838deaae6a35acad242af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f9cbd5fce2c4819aadefcf10dcd4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd68201c2f21edf7575166ce1ef82ae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://img.xkw.com/dksih/QBM/2022/2/16/2917780834074624/2918913037582336/STEM/69b2636d-dd93-4c06-b114-72d6a5764755.png?resizew=182)
(1)若抛物线C的焦点坐标为(0,2),求p的值和抛物线C的准线方程:
(2)若存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/506c25a883f7d0e2342419e1e9f6b142.png)
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4 . 已知抛物线
的焦点为F,以F和准线上的两点为顶点的三角形是边长为
的等边三角形,过
的直线交抛物线E于A,B两点.
(1)求抛物线E的方程;
(2)是否存在常数
,使得
,如果存在,求
的值,如果不存在,请说明理由;
(3)证明:
内切圆的面积小于
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c42d88e496a17562d25195301e0ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f83dbfddc6f98548699ed581e8c8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ab82c33e6c1f8b73628fa78e6868b4.png)
(1)求抛物线E的方程;
(2)是否存在常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33104cb3b15fa0e01842e78f9ed59701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
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