如图,开口向下顶点为D的抛物线经过点A(0, 5),B(-1,0),C(5,0)与x轴交于B、C两点(B在C左侧),点A和点E关于抛物线对称轴对称.
![](https://img.xkw.com/dksih/QBM/2014/12/26/1573778815877120/1573778822381568/STEM/d53b7578d596427db3cd81a08b7ce0cd.png?resizew=168)
(1)求该抛物线的解析式;
(2)经过原点O和点E的直线与抛物线的另一个交点为F.
①求点F的坐标;
②求四边形ADEF的面积;
(3)若M为抛物线上一动点,N为抛物线对称轴上一动点,是否存在M,N,使得以A、E、M、N为顶点的四边形为平行四边形,若存在,求出所有满足条件的M、N的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2014/12/26/1573778815877120/1573778822381568/STEM/d53b7578d596427db3cd81a08b7ce0cd.png?resizew=168)
(1)求该抛物线的解析式;
(2)经过原点O和点E的直线与抛物线的另一个交点为F.
①求点F的坐标;
②求四边形ADEF的面积;
(3)若M为抛物线上一动点,N为抛物线对称轴上一动点,是否存在M,N,使得以A、E、M、N为顶点的四边形为平行四边形,若存在,求出所有满足条件的M、N的坐标;若不存在,请说明理由.
更新时间:2016-12-05 22:04:07
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【推荐1】如图①,平面直角坐标系中,
为原点,点A坐标为
,
轴,点
在
轴上,一次函数
的图象经过点
、
.
(1)点
的坐标为________,点
的坐标为________;
(2)如图②,直线
经过点
,且与直线
交于点
,
与
关于直线
对称,连接
并延长,交射线
于点
,当
时,求直线
的函数表达式;
(3)在(2)的条件下,点
在直线
上运动,点
在直线
上运动,以
、
、
、
为顶点的四边形能否成为平行四边形?若能,直接写出点
的坐标;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd0825e68122a65426840fbf07cf296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d931bce6368ba976d026f1f0984ca3d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4695d25d3ea08ec060cd4f3f5b3a1c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/13575b25-3bf1-4663-aa60-cdc25fb887f4.png?resizew=352)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如图②,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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0a3eaf945372d41ec7f60edcace43d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】某校八年级学生在数学课上进行了项目化学习研究,某小组研究如下:
【提出驱动性问题】机场监控问题.
【设计实践任务】选择“素材1”“素材2”,设计了“任务1”“任务2”“任务3”的实践活动.请你尝试帮助他们解决相关问题.
【提出驱动性问题】机场监控问题.
【设计实践任务】选择“素材1”“素材2”,设计了“任务1”“任务2”“任务3”的实践活动.请你尝试帮助他们解决相关问题.
机场监控问题的思考 | ||
素材1 | 如图是某机场监控屏显示两飞机的飞行图象,1号指挥机(看成点![]() ![]() ![]() | |
素材2 | 2号试飞机(看成点![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() | |
问题解决 | ||
任务1 | 求解析式和速度 | 求出![]() ![]() ![]() |
任务2 | 求解析式和坐标 | 求出![]() ![]() ![]() |
任务3 | 计算时长 | 通过计算说明两机距![]() ![]() |
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【推荐1】平面直角坐标系中,抛物线C1:y1=x2-2mx+2m2-1,抛物线C2:y2=x2-2nx+2n2-1,
(1)若m=2,过点A(0,7)作直线l垂直于y轴交抛物线C1于点B、C两点.
①求BC的长;
②若抛物线C2与直线l交于点E、F两点,若EF长大于BC的长,直接写出n的范围;
(2)若m+n=k(k是常数),
①若
,试说明抛物线C1与抛物线C2的交点始终在定直线上;
②求y1+y2的最小值(用含k的代数式表示) .
(1)若m=2,过点A(0,7)作直线l垂直于y轴交抛物线C1于点B、C两点.
①求BC的长;
②若抛物线C2与直线l交于点E、F两点,若EF长大于BC的长,直接写出n的范围;
(2)若m+n=k(k是常数),
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d9712c3b25f3030e166e136d3a4686.png)
②求y1+y2的最小值(用含k的代数式表示) .
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【推荐2】如图,在平面直角坐标系中,四边形
是矩形,点
,
,点
在
轴上,点
在
轴上,过
,
两点的抛物线
交
轴于点
,点
为抛物线上一动点,过点
作
轴于点
,交
于点
,交
于点
,设点
的横坐标为
.
(1)求
和
的值;
(2)当
,
,
,
四点组成的四边形为平行四边形时,求
的值;
(3)以
为边作正方形
,当点
恰好在
轴上时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f17a3fa4036efe1d4c35c14e57952e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0cb079e31187ad8be8fa3c9185a5548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8dad333f1e4d81a55709acb4f1a3ac1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/b42f9fd6-48c5-48d4-83a2-36fc5b81c810.jpg?resizew=134)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)当
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea13d5af362344c8bea7d245dfd55329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐1】如图,直线
与x,y轴分别交于点B,A,顶点为P的抛物线
过点A.
![](https://img.xkw.com/dksih/QBM/2022/4/21/2962768413024256/2964603586658304/STEM/3a54319c-b3c5-4f50-9f0f-d3a12f971a80.png?resizew=399)
(1)求出点A,B的坐标及c的值;
(2)若函数
在
时有最大值为
,求a的值;
(3)若
,连接AP,过点A作AP的垂线交x轴于点M.设△BMP的面积为S.
①直接写出S关于a的函数关系式及a的取值范围;
②结合S与a的函数图象,直接写出
时a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d039de5bf810e3ff6b0b6096fa48d462.png)
![](https://img.xkw.com/dksih/QBM/2022/4/21/2962768413024256/2964603586658304/STEM/3a54319c-b3c5-4f50-9f0f-d3a12f971a80.png?resizew=399)
(1)求出点A,B的坐标及c的值;
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d039de5bf810e3ff6b0b6096fa48d462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20d1be3f52520e09f4a76b53b3d4481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7570c77bd375f4dfdffee64fce8d1a9a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
①直接写出S关于a的函数关系式及a的取值范围;
②结合S与a的函数图象,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df566ee8b581edbf7d4f9e23e21e8bf.png)
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【推荐2】如图,二次函数
的图象交x轴于点
,
,交y轴于点C.点
是x轴上的一动点,
轴,交直线
于点M,交抛物线于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/63358446-673d-4359-9452-3fb2d1c1306e.png?resizew=279)
(1)求这个二次函数的表达式:
(2)①若点P仅在线段
上运动,求线段
的最大值;
②若点P在x轴上运动,当
为等腰三角形时,写出所有满足条件的点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c33700c3358cbbd8db376f9f0613b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb898663f98b8400a897913b4d3102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fd5a9d9ac5d8c5ed449328cb9e02df1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/63358446-673d-4359-9452-3fb2d1c1306e.png?resizew=279)
(1)求这个二次函数的表达式:
(2)①若点P仅在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
②若点P在x轴上运动,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
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真题
名校
【推荐1】综合与探究
如图,抛物线
与
轴交于A、B两点(点A在点B的左侧),与
轴交于点C,连接AC、BC.点P沿AC以每秒1个单位长度的速度由点A向点C运动,同时,点Q沿BO以每秒2个单位长度的速度由点B向点O运动,当一个点停止运动时,另一个点也随之停止运动,连接PQ,过点Q作QD⊥x轴,与抛物线交于点D,与BC交于点E.连接PD,与BC交于点F.设点P的运动时间为
秒(
).
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/8b22fabd-5761-4b14-9a22-40670516f6f4.png)
(1)求直线BC的函数表达式.
(2)①直接写出P、D两点的坐标(用含
的代数式表示,结果需化简).
②在点P、Q运动的过程中,当PQ=PD时,求
的值.
(3)试探究在点P、Q运动的过程中,是否存在某一时刻,使得点F为PD的中点.若存在,请直接写出此时
的值与点F的坐标;若不存在,请说明理由.
如图,抛物线
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/7b8b4718de2b466ba6eb568b7e24976e.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/8c0962f93b0c41349d740245f4f3b053.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/1882b35c6bdd482ea05a21f9b9269d5f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/bb1118605b084de6a56d3e7c1119ab41.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/2aa0a98c4bce40608da66041f132dd76.png)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/8b22fabd-5761-4b14-9a22-40670516f6f4.png)
(1)求直线BC的函数表达式.
(2)①直接写出P、D两点的坐标(用含
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/bb1118605b084de6a56d3e7c1119ab41.png)
②在点P、Q运动的过程中,当PQ=PD时,求
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/bb1118605b084de6a56d3e7c1119ab41.png)
(3)试探究在点P、Q运动的过程中,是否存在某一时刻,使得点F为PD的中点.若存在,请直接写出此时
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773760937656320/1773760938016768/STEM/bb1118605b084de6a56d3e7c1119ab41.png)
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【推荐2】如图,直线
与x轴,y轴分别相交于A,B两点,抛物线
经过点B.
(1)求该抛物线的解析式及顶点坐标;
(2)连结BD,以AB,BD为一组邻边的平行四边形ABDE,顶点E是否在抛物线上?
(3)已知点M是抛物线上的一个动点,并且点M在第一象限内,连接AM、BM,设点M横坐标为m,△ABM的面积为S,求S与m的函数表达式,并求出S的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6f2dede1bb4e23ad8d5a9059d5192f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5e711ec63fe446c5682fddc7622a78.png)
(1)求该抛物线的解析式及顶点坐标;
(2)连结BD,以AB,BD为一组邻边的平行四边形ABDE,顶点E是否在抛物线上?
(3)已知点M是抛物线上的一个动点,并且点M在第一象限内,连接AM、BM,设点M横坐标为m,△ABM的面积为S,求S与m的函数表达式,并求出S的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/15/689353a6-e558-4374-8a1d-3d1ec564e4c7.png?resizew=343)
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