1 . 已知抛物线
的焦点为
,点
,若点
为抛物线上任意一点,当
取最小值时,点
的坐标为____________ .
![](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/fd5fb552c79ab5d45b0aeafc06e58542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe2f98670913d4105454f49caba53a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2 . 抛物线有如下光学性质:从焦点发出的光线,经过抛物线上的一点反射后,反射光线平行于抛物线的对称轴.如下示意图中,手电筒内,在小灯泡的后面有一个反光镜,镜面的形状是一个由抛物线绕它的对称轴旋转所得到的曲面.该镜面圆形镜口的直径
,镜深
.为使小灯泡发出的光经镜面反射后,射出为一束平行光线,则该小灯泡距离镜面顶点
的距离应为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df427a58aa333bc742b58cafd6c630d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2022/12/16/3132259135905792/3134011188396032/STEM/d3fb8c44743b4aad859fa5c0c208deb2.png?resizew=485)
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解题方法
3 . 已知抛物线
的焦点为
,准线为
,过点
的直线与
交于
两点(点
在
轴上方),过
分别作
的垂线,垂足分别为
,连接
.若
,则直线
的斜率为__________ .
![](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/0f85fca60a11e1af2bf50138d0e3fe62.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/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77ee9501de52251daba04e12794507b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a12d8d958227a50095faa3622ae2e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2022-05-21更新
|
1563次组卷
|
5卷引用:山西省吕梁市2022届高三三模理科数学试题
山西省吕梁市2022届高三三模理科数学试题山西省吕梁市2022届高三三模文科数学试题河北省沧州市2022届高三第二次模拟数学试题(已下线)重难点10四种解析几何数学思想-1(已下线)专题21 抛物线的焦点弦 微点2 抛物线的焦点弦常用结论及其应用综合训练
解题方法
4 . 已知
为抛物线
上一动点,
为抛物线的焦点,过点
作
的垂线,垂足为
.点
为圆
上一动点,则
的最小值是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.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/639c3d2ff5ee566fcc1b69c65712a661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c2eb612262fdc5b85b27806f1d89fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4444e077aa6ff1816bca1a55b49e020b.png)
您最近一年使用:0次
名校
5 . 已知直线l:
与抛物线C:
交于
,
两点,点A,B在准线上的射影分别为点
,
,若四边形
的面积为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2348e2bbfb3ab494d0476dcd68b3effb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7452ddb20286551f2d4ba3e7a76bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
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2022-03-01更新
|
285次组卷
|
3卷引用:山西省吕梁市2022届高三下学期开年摸底联考(全国卷1)数学(文)试题
解题方法
6 . 已知
是抛物线
上的一个动点,则
到直线
和
的距离之和的最小值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d31941587483ebe286dc590de99bf7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc8ea0bf79c496f92371df881b433cd.png)
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名校
7 . 已知抛物线
上横坐标为1的点到顶点的距离与到准线的距离相等,则该抛物线的方程为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3764ba3aa0a241787f4661026bb14053.png)
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2020-03-21更新
|
282次组卷
|
3卷引用:山西省运城市永济涑北中学2019-2020学年高二上学期12月月考数学(文)试题
名校
8 . 已知抛物线
,过焦点
作直线与抛物线交于点
,
两点,若
,则点
的坐标为 _________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/157c4a262379cd672b3e7d4b924cf0d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2019-09-14更新
|
760次组卷
|
8卷引用:山西省太原市实验中学2021-2022学年高二上学期12月月考数学试题
山西省太原市实验中学2021-2022学年高二上学期12月月考数学试题吉林省长春外国语学校2018-2019学年高二下学期期末考试数学(文)试题湖南省岳阳市阳县一中、汨罗市一中2019-2020学年高二上学期10月月考数学试题广东省汕头市东厦中学、汕头市达濠华侨中学2021-2022学年高二下学期阶段一考试数学试题浙江省金华市江南中学等两校2022-2023学年高二上学期12月阶段测试数学试题江苏省连云港市四校(新浦中学、海滨中学、锦屏高级中学、开发区高级中学)2022-2023学年高二上学期期中联考数学试题江苏省苏州市黄埭中学2023-2024学年高二上学期12月月考调研数学试题江苏省苏州市高新区第一中学教育集团2023-2024学年高二上学期12月月考数学试题
名校
9 . 过抛物线
的焦点
作直线
与该抛物线交于两点,过其中一交点
向准线作垂线,垂足为
,若
是面积为
的等边三角形,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d7ffb7889a31b267a85f1ea238138e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082e5384a4c127c41abccc6707877273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
您最近一年使用:0次
2018-07-07更新
|
301次组卷
|
2卷引用:山西省长治市潞州区第二中学校2019-2020学年高二上学期期末数学(理)试题