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解题方法
1 . 已知抛物线
的准线为
,O为坐标原点,A、B都在此抛物线上,若直线
过
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c2f156b05838deaae6a35acad242af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb70fdf064b9193e506ca43f4672af56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e5e815fc2bbf03d424b52fa920dd0e.png)
A.4 | B.8 | C.0 | D.![]() |
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2 . 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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3 . 已知抛物线
的焦点
,过焦点
的直线
交抛物线于
两点,若
是线段
的中点,则下列结论不正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be92f0e0012a7696c78e3e00513edefd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b15bc087b10ca24de082ac70fff6496.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.![]() | B.准线方程为![]() |
C.![]() | D.点![]() |
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2022-02-04更新
|
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2卷引用:安徽省滁州市定远县育才学校2021-2022学年高三下学期开学考试数学(文)试题
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4 . 已知抛物线
的焦点
与双曲线
的右焦点重合,斜率为
的直线
与
的两个交点为
,
.若
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df40ba57bb5819b4aaa38d514500052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10312edfc707694c40f0352d62ab0d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1dc85723f64c4d545ccc4e4200fcab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2021-02-24更新
|
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5 . 已知抛物线
的焦点F(1,0),O为坐标原点,A,B是抛物线C上异于 O的两点.
(1)求抛物线C的方程;
(2)若直线AB过点(8,0),求证:直线OA,OB的斜率之积为定值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
(1)求抛物线C的方程;
(2)若直线AB过点(8,0),求证:直线OA,OB的斜率之积为定值
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2019-05-14更新
|
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