解题方法
1 . 如图,在平面直角坐标系
中,已知抛物线
经过点
,直线
与抛物线
交于
、
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/1f12e117-fe49-4ab9-adaa-b859a43038a0.png?resizew=142)
(1)若
,求
的值;
(2)当
时,直线
是否过定点?若是过定点,求出该定点;若不过定点,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f24e616b5a35ff372c78c1472f156ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/1f12e117-fe49-4ab9-adaa-b859a43038a0.png?resizew=142)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991477ce55949ea56571c0434cc8edcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59747cee312ee5140643428cae79efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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2 . 已知抛物线的方程是
,直线l交抛物线于A,B两点.
(1)若弦AB的中点为
,求弦AB的直线方程;
(2)设
,若
,求证:直线AB过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
(1)若弦AB的中点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86022205a7487439dd8d0897cd3bf19.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a1467ecf286e3cadaf5aa006606f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b8b0499988ee9f02f3c0ef389deb1b.png)
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解题方法
3 . 已知抛物线
,直线l与抛物线C交于M,N两点,且
,
,则点A到直线l的距离的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ad3432ac96b0a38beaa7f2edc3499.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/964889aaf14b9ef1837a988c048788e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
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解题方法
4 . 已知抛物线
:
(
)的焦点为
,点
在
上,且
.
(1)求
的方程;
(2)若不过点
的直线
与
相交于
两点,且直线
,
的斜率之积为1,证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b35f0b940c8422ef47edc3b7ce55e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dece47c23e53eca430269ad7b12e0891.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4af1560bfd68fa9e4e82093d327ab7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff29e80ba6c16e1177e7873a396a7a6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若不过点
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
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5 . 直线
过抛物线
的焦点
,且与抛物线交于
,
不同的两点,点
在抛物线的准线上,且
//
轴.
(1)证明:
;
(2)判断直线
是否经过坐标原点,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ff82ebdfad5e7de1c7487b0b817a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53e311ee0b5085e7e5a45c606daa5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af529571cca0e6957a197fe3f878d419.png)
(2)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解题方法
6 . 已知抛物线
上一点
的横坐标为4,且
到焦点
的距离为5,直线
交抛物线于
,
两点(位于对称轴异侧),
为坐标原点,且
.
(1)求抛物线的方程;
(2)求证:直线
必过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/0f85fca60a11e1af2bf50138d0e3fe62.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5175325801a61d53b0c7d776afd2e2d0.png)
(1)求抛物线的方程;
(2)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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2023-03-18更新
|
338次组卷
|
3卷引用:河南省省直辖县级行政单位济源市2022-2023学年高二上学期期末数学理科试题
名校
解题方法
7 . 已知抛物线C:
的焦点为F,过焦点F且垂直于x轴的直线交C于H,I两点,O为坐标原点,
的周长为
.
(1)求抛物线C的方程;
(2)过点F作抛物线C的两条互相垂直的弦AB,DE,设弦AB,DE的中点分别为P,Q,试判断直线PQ是否过定点?若过定点.求出其坐标;若不过定点,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17a4da6e9444dafed486ef595d2c1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4e17b0d012cea669249f2ef3d3e170.png)
(1)求抛物线C的方程;
(2)过点F作抛物线C的两条互相垂直的弦AB,DE,设弦AB,DE的中点分别为P,Q,试判断直线PQ是否过定点?若过定点.求出其坐标;若不过定点,请说明理由.
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2022-06-13更新
|
1990次组卷
|
6卷引用:江西省景德镇市2021-2022学年高二下学期期末质量检测数学(文)试题
江西省景德镇市2021-2022学年高二下学期期末质量检测数学(文)试题(已下线)第09讲 高考难点突破一:圆锥曲线的综合问题(定点问题) (精讲)-2(已下线)专题24 圆锥曲线中的存在性、探索性问题 微点2 圆锥曲线中的探索性问题(已下线)专题31 圆锥曲线的垂直弦问题-2河南省开封市杞县高中2023届高三文科数学第一次摸底试题(已下线)重难点突破08 圆锥曲线的垂直弦问题 (八大题型)
解题方法
8 . 在平面直角坐标系
中,已知动圆
与圆
内切,且与直线
相切,设动圆圆心
的轨迹为曲线
.
(1)求曲线
的方程;
(2)曲线
上存在一点
,不经过点
的直线
与
交于
,
两点,若直线
,
的斜率之和为
,证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216fa9581783db9cc74549636cf0a1a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/222125725b2c8027c03cb08834b6e928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
(2)曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40d197d06e0c6f202efe9f0820a56af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c4dce884147e801b50675b9c0714e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a159de0b2d9eb1ae0b7e664e64d3c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0914b68f106a912420705b2f3928ca42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c77e9c89b7275b0c1a9af5c9a72e5968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b5e290c6b2c5508a3bf6117afbf7e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9880952857950577055578875ab29141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a159de0b2d9eb1ae0b7e664e64d3c6c.png)
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2022-10-24更新
|
634次组卷
|
5卷引用:河南省南阳市第六完全学校高级中学2022-2023学年高二上学期10月月考数学试题
河南省南阳市第六完全学校高级中学2022-2023学年高二上学期10月月考数学试题中学生标准学术能力诊断性测试2021-2022学年高三上学期1月月考数学试题THUSSAT中学生标准学术能力诊断性测试2021-2022学年高三上学期1月月考理科数学试题(已下线)专题13解析几何中的定值、定点和定线问题(讲)--第一篇 热点、难点突破篇-《2022年高考数学二轮复习讲练测(新高考·全国卷)》(已下线)专题9-5 圆锥曲线大题基础:定点归类
9 . 已知F为抛物线
的焦点,点A,B在该抛物线上且位于x轴的两侧,
(其中O为坐标原点),则
与
面积之和的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/725958ac97752a7b37a679ce16bcfe91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7959e0af6500a4756c8a50ad8638be61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33fff07a5663bcc25319bfa6876706f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/618a5b77f4a4b83d8c144e7a180e12f3.png)
A.![]() | B.3 | C.![]() | D.![]() |
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2022-10-17更新
|
1937次组卷
|
8卷引用:辽宁省铁岭市昌图县第一高级中学2022-2023学年高二上学期10月月考数学试题
解题方法
10 . 抛物线
的焦点
是椭圆
的一个焦点.
(1)求
的准线方程;
(2)若
是直线
上的一动点,过
向
作两条切线,切点为M,N,试探究直线MN是否过定点?若是,请求出定点,若否,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82ea1be9b9b6bb12afa7e1ce703d1603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c190e8bb81a4d26cf638ed246193cc9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b40b35e8c7578ec1ca1eb5c7ca4ddc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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