1 . 一般地,抛物线的三条切线围成的三角形称为抛物线的切线三角形,对应的三个切点形成的三角形称为抛物线的切点三角形.如图,
,
分别为抛物线
的切线三角形和切点三角形,
为该抛物线的焦点.当直线
的斜率为
时,
中点的纵坐标为
.
.
(2)若直线
过点
,直线
分别与该抛物线的准线交于点
,记点
的纵坐标分别为
,证明:
为定值.
(3)若
均不与坐标原点重合,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed4022e6522665dab4ce898a539e5c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6d8eaacc2d999b37209feba103f9ea.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/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374fe9986ebbc986fc422e514ab93a51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c0ba21d81e9f78014ea501cd494af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26690f078768c54d833988769b8bc425.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120c51a5eda9524a1e187420c0c8bac6.png)
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名校
解题方法
2 . 抛物线
为定值
焦点为
,
与直线
相交于
两点,
为
中点.过
作
轴的垂线,垂足为
,过
作
的垂线,交
轴于
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7710c25ab55dbd26325a09dccd37f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.![]() |
B.![]() |
C.![]() |
D.存在唯一的![]() ![]() |
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3 . 已知点
在抛物线
上,过点
的直线
与
相交于
两点,直线
分别与
轴相交于点
.
(1)当弦
的中点横坐标为3时,求
的一般方程;
(2)设
为原点,若
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a865d0cdbd1f950ba14112528db7af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fef26f14e6a51c897b4dd93c72ad133.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/03df57efff473b3cfeb8503796b7d6b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
(1)当弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b19c26574ddeb2154b2cbc2f755a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed3650dd045ee37623cefbea36f17c9.png)
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4 . 已知O为坐标原点,F为抛物线
的焦点,C的准线与x轴的交点为
,过F的直线l与C交于A,B两点,与C的准线交于点E,直线l的倾斜角
,且点A在第一象限,下列选项正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ff329f3b12cf5678e99941e7188621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480888079e87df2b1c0734114a594d3e.png)
A.![]() | B.![]() |
C.若F为AE的中点,则![]() | D.若B为AE的中点,则![]() |
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2023-04-21更新
|
507次组卷
|
2卷引用:河北省承德市2023届高三下学期4月高考模拟数学试题
5 . 已知
为抛物线
上的三个点,焦点F是
的重心.记直线AB,AC,BC的斜率分别为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f76ebe0aa5dfcb3fe3e7a4393a2068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b87284619bfc2eba84da2852bc1d4b.png)
A.线段BC的中点坐标为![]() |
B.直线BC的方程为![]() |
C.![]() |
D.![]() |
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2023-04-12更新
|
1115次组卷
|
3卷引用:浙江省金华十校2023届高三下学期4月模拟数学试题
6 . 已知
是抛物线
上两动点,
为抛物线
的焦点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.直线![]() ![]() ![]() |
B.直线![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.点![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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2022-08-31更新
|
1577次组卷
|
8卷引用:重庆市2023届高三冲刺押题联考(二)数学试题
重庆市2023届高三冲刺押题联考(二)数学试题湖南省部分校2022-2023学年高三上学期入学检测数学试题湖南师范大学附属中学2023届高三上学期第一次月考数学试题(已下线)9.4 抛物线(精练)(已下线)专题40 抛物线及其性质-3江苏省扬州市邗江中学2022-2023学年高二上学期期中数学试题(已下线)第22讲 抛物线中的5种最值问题-【同步题型讲义】2022-2023学年高二数学同步教学题型讲义(人教A版2019选择性必修第一册)(已下线)专题3.3 抛物线(6个考点十大题型)(3)
7 . 设抛物线
与直线
相交于不同的两点
、
,弦
的垂直平分线与
轴交于
,与
的准线交于
.下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1ba86ffc6e5542b62319848c14acaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54479885d4ab2f717d2e97718da04b43.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
A.![]() | B.弦![]() |
C.存在唯一的![]() ![]() | D.存在唯一的![]() ![]() |
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名校
解题方法
8 . 在平面直角坐标系xOy中,过点
的直线l与抛物线C:
交于A,B两点,点
为线段AB的中点,且
,则下列结论正确的为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99296bab1b42898e7ca336a822510258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73c0f68d721ebd050c16e6cb776be42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b31cba604de789a396135e56270d837.png)
A.N为![]() | B.M可以为C的焦点 |
C.l的斜率为![]() | D.![]() |
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名校
解题方法
9 . 在平面直角坐标系中,
为坐标原点,抛物线
的焦点为
,抛物线
上不同两点
同时满足下列三个条件中的两个:①
;②
;③直线
的方程为
.
(1)请分析说明两点
满足的是哪两个条件?并求抛物线
的标准方程;
(2)若直线
与抛物线
相切于点
与椭圆
相交于
两点,
与直线
交于点
,以
为直径的圆与直线
交于
两点,求证:直线
经过线段
的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/083f25c5e40f66fd2686dbce367e382c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21946416f43b27fbe3bd23bc87d8b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68831f427cd565ac3cc341024c9a422.png)
(1)请分析说明两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若直线
![](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/2533197f8ee31f7b77fb3db1929624ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d534c1b34556ff65910165035ea48d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1729d766f56cadd405bc12d57bcb1e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1729d766f56cadd405bc12d57bcb1e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b330da8d6528070cc1c4196c29c8569c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54d290009e138d1f0d4cb771cada9f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2021-05-27更新
|
574次组卷
|
3卷引用:山东省青岛市2021届高三三模数学试题
山东省青岛市2021届高三三模数学试题江苏省常州市前黄高级中学2021届高三下学期6月高考适应性考试(二)数学试题(已下线)考点64 章末检测九-备战2022年高考数学一轮复习考点帮(新高考地区专用)【学科网名师堂】
解题方法
10 . 已知面积为16的等腰直角
(
为坐标原点)内接于抛物线
,
,过抛物线的焦点
且斜率为2的直线
与该抛物线相交于
,
两点,点
是
的中点.
(1)求此抛物线的方程和焦点
的坐标;
(2)若焦点在
轴上的椭圆
经过点
,求椭圆
短轴长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(1)求此抛物线的方程和焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)若焦点在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/c5db41a1f31d6baee7c69990811edb9f.png)
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