1 . 已知抛物线
,过点
的动直线
交抛物线于
,
两点
(1)当
恰为
的中点时,求直线
的方程;
(2)抛物线上是否存在一个定点
,使得以弦
为直径的圆恒过点
?若存在,求出点
的坐标;若不存在,请说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23d0aabf43bf2404ec97a0fae5c1b62.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)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)抛物线上是否存在一个定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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2019-05-10更新
|
895次组卷
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4卷引用:【全国百强校】江西省临川一中2019届高三年级考前模拟考试理科 数学试题
名校
解题方法
2 . 已知抛物线E:
,圆C:
.
若过抛物线E的焦点F的直线l与圆C相切,求直线l方程;
在
的条件下,若直线l交抛物线E于A,B两点,x轴上是否存在点
使
为坐标原点
?若存在,求出点M的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661bd8d4d82205bd311e7349ae91f602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d0a5d6f0589c14bf45c5c56676bd43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a4e7a7d38d0cdcabc25b8b5821539b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee213fd9ff0cda2986e9c5318eab3812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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2019-04-16更新
|
686次组卷
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5卷引用:安徽省六安市毛坦厂中学2019届高三3月月考理科数学试题
名校
3 . 已知抛物线E:x2=2py(p>0)的焦点为F,直线x=2与x轴的交点为M,与抛物线E的交点为N,且4|FN|=5|MN|.
(1)求抛物线E的方程;
(2)若直线y=kx+2与E交于A,B两点,C(0,-2),记直线CA,CB的斜率分别为k1,k2,求证:k12+k22-2k2为定值.
(1)求抛物线E的方程;
(2)若直线y=kx+2与E交于A,B两点,C(0,-2),记直线CA,CB的斜率分别为k1,k2,求证:k12+k22-2k2为定值.
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2019-04-16更新
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546次组卷
|
2卷引用:江西省南昌市第二中学2020—2021学年高二文科上学期期中考试数学试题
4 . 已知抛物线
:
的焦点为
,点
在
上且其横坐标为1,以
为圆心、
为半径的圆与
的准线相切.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/77b69a0b-3b07-4c61-8ed3-289666880e6b.png?resizew=150)
(1)求
的值;
(2)过点
的直线
与
交于
,
两点,以
、
为邻边作平行四边形
,若点
关于
的对称点在
上,求
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b3932717847eb0859019f07a7445ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c61f260aa8e527b13b25ed345b76859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/77b69a0b-3b07-4c61-8ed3-289666880e6b.png?resizew=150)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39ed4cb2142dc0079cc4fe4b660558f.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d9792485ccd1ba479ceba6397c15ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b418d67b301ebfd7db583aa176e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bef069d445a1b10368796de8e4524e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
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名校
5 . 已知F为抛物线E:
(p>0)的焦点,C(
,1)为E上一点,且|CF|=2.过F任作两条互相垂直的直线
,
,分别交抛物线E于P,Q和M,N两点,A,B分别为线段PQ和MN的中点.
(1)求抛物线E的方程及点C的坐标;
(2)试问
是否为定值?若是,求出此定值;若不是,请说明理由;
(3)证明直线AB经过一个定点,求此定点的坐标,并求△AOB面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b35f0b940c8422ef47edc3b7ce55e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(1)求抛物线E的方程及点C的坐标;
(2)试问
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1047d5e7dd5a6ec93119a867a191ff55.png)
(3)证明直线AB经过一个定点,求此定点的坐标,并求△AOB面积的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/f289a0e1-e6a1-46a2-8c59-c5947e5a95fb.png?resizew=135)
您最近一年使用:0次
2019-03-12更新
|
424次组卷
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4卷引用:【全国百强校】江西省上高县第二中学2018-2019学年高二下学期第一次月考数学(理)试题
【全国百强校】江西省上高县第二中学2018-2019学年高二下学期第一次月考数学(理)试题湖南省湘潭市2018-2019学年高二第一学期期末理科数学试题(已下线)专题15 《圆锥曲线与方程》中的定点问题(1)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册) 黑龙江省佳木斯市第一中学2021-2022学年高二上学期第二次月考数学试题
名校
6 . 已知过点
的直线l与抛物线E:
交于点A,B.
若弦AB的中点为M,求直线l的方程;
设O为坐标原点,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbf3925a451f83180e14382d15fafe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294b85c50741fbeeeb3f52f012434afa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87be53262d72dda5dd55d79ab20ff0b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526253844494fed86429e1390505e0db.png)
您最近一年使用:0次
2019-03-06更新
|
2029次组卷
|
8卷引用:江西省南昌市2019-2020学年进贤二中高二下学期第一次月考数学(理)试题
(已下线)江西省南昌市2019-2020学年进贤二中高二下学期第一次月考数学(理)试题【市级联考】吉林省白山市2018-2019学年高二上学期期末联考数学(理)试题【市级联考】河南省新乡市2018-2019学年高二上学期期末考试数学(文)试题山西省临汾一中、翼城中学、曲沃中学等学校2018-2019学年高二上学期期末数学(文)试题安徽省滁州市九校2019-2020学年高二上学期期末考试数学(文)试题贵州省黔南州2018-2019学年高二上学期期末考试数学(文)试题山西省2018-2019学年高二上学期期末联合考试数学(理)试题吉林省四平市第一高级中学2019-2020学年高二上学期第三次月考数学(文)试题
名校
7 . 已知抛物线C的顶点在坐标原点,焦点F在x轴上,抛物线C上一点
到焦点F的距离为
.
Ⅰ
求抛物线C的标准方程;
Ⅱ
设点
,过点
的直线l与抛物线C相交于A,B两点,记直线MA与直线MB的斜率分别为
,
,证明:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9647bae17162b7762b696cdd7470d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9558bc4e32934b0bfa2741bb926cdbc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ebcbf2f2ba9ccb685421aab5756b7b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5b48627db097a918817f8ea405f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f375dc5addedc5f9fbb72d566939c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731f980ccb6f902d460d0ea2920bfe2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5117784d5f7629ba7d20788328e6a1cd.png)
您最近一年使用:0次
2019-03-04更新
|
1066次组卷
|
5卷引用:江西省宜春市第九中学2020-2021学年高二上学期期中考试数学(文)试题
8 . 已知动圆
过定点
,且在
轴上截得的弦长为
,设该动圆圆心的轨迹为曲线
.
(1)求曲线
的方程;
(2)直线
过曲线
的焦点
,与曲线
交于
、
两点,且
,
都垂直于直线
,垂足分别为
,直线
与
轴的交点为
,求证
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15ed90ebf0061c8a79beed307fc1719a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30f47b39dc3707fbea899443a6ae6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8454989732716850cb57ca15f8ef596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cf47cd8ea5df4dd990055eb5dce60e.png)
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2019-03-02更新
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347次组卷
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2卷引用:江西省吉安市第一中学、新余一中2019届高三下学期第一次联考数学(文)试题
9 . 已知抛物线
,过焦点
作垂直于
轴的直线
,
与抛物线
相交于
,
两点,
为
的准线上一点,且
的面积为4.
(1)求抛物线
的标准方程.
(2)设
,若点
是抛物线
上的任一动点,则是否存在垂直于
轴的定直线被以
为直径的圆截得的弦长为定值?如果存在,求出该直线方程和弦长,如果不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f579b73ca01978ec68e716f993bc3766.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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名校
10 . 已知抛物线
,过抛物线
的焦点的直线
与抛物线
相交于
,
两点,线段
的长度为8,且
的中点到
轴的距离为3.
(1)求抛物线
的方程;
(2)已知抛物线
与直线
交于
,
两点,判断坐标原点
是否在以
为直径的圆上,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e6c830bfa9a1b979a1a9665166424bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.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://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac9c28423525cd64257179476c408db8.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2019-02-10更新
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477次组卷
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3卷引用:江西省临川第一中学2018-2019学年高二上学期期末考试数学(理)试题