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)
18-19八年级上·浙江宁波·期中 查看更多[2]
更新时间:2020-12-09 07:59:32
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【推荐1】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.
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【推荐2】如图,抛物线
与x轴的交点为A,B两点,与y轴的交于点C,
.
(1)求抛物线的解析式;
(2)P为抛物线在第四象限上的一点,直线
与抛物线的对称轴相交于点M,若
是以
为底边的等腰三角形,求点P的坐标;
(3)P是该抛物线上位于对称轴右侧的动点,Q、N是抛物线对称轴上两点,
. 求证:存在确定的点N,使直线
与抛物线只有唯一交点P.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1768e0c1d2650b638d624b34d1459e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df74a82d52fa9d42780887e48fba8d08.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/97e03fa8-a542-4db5-9e43-e22ef6d6f199.png?resizew=304)
(1)求抛物线的解析式;
(2)P为抛物线在第四象限上的一点,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddb32a7a5c157fdf8aa049b2d665b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)P是该抛物线上位于对称轴右侧的动点,Q、N是抛物线对称轴上两点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c6ffb06342e15d59c23b52e6ab2cb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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解题方法
【推荐1】如图,抛物线
与
轴交于
、
两点,与
轴交于
点.
(1)在第二象限内的抛物线上确定一点
,使四边形
的面积最大.求出点
的坐标.
(2)点
为抛物线上一动点,
轴上是否存在一点
,使点
、
、
、
的顶点的四边形是平行四边形,若存在,请直接写出
点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f57c5d08e534712f29c041ee91478d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)在第二象限内的抛物线上确定一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2337f3f2678b04fed029b15ec53cfad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)点
![](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/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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2021/11/15/2851941749342208/2857503365201920/STEM/e7c4a7bb-b4bb-41ac-89e0-71a4d02298c3.png)
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【推荐2】如图,已知抛物线
与x轴交于点A,
(点A在点B的左侧),与y轴交于点C,对称轴是直线
,P是第一象限内抛物线上一个动点.
(2)过点P作
轴,与线段
交于点M,垂足为点H,若
时,求
的面积;
(3)若以P,M,C为顶点的三角形是以
为底角的等腰三角形时,求线段
的长;
(4)已知点Q是直线PC上一点,在(3)的条件下,直线
上是否存在一点K,使得以Q,M,C,K为顶点的四边形是矩形?若存在,请直接写出点K的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba23d524dc2a51f2a2f5a2eec842f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f605a7fc2f1064fe14882ee426839db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
(2)过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3a3db6d96518255f96ad7fc1ac98f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f66ee737c6e801b59ca41375e862858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
(3)若以P,M,C为顶点的三角形是以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef4b1c543556979436ca61ee0438fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438f34bc8b04e8c494b91306ac6fe352.png)
(4)已知点Q是直线PC上一点,在(3)的条件下,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
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【推荐1】如图1,在平面直角坐标系中,抛物线
与
轴交于点
,点
,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/374ddbfb-6357-42b8-9a66-cc1e66b72d52.png?resizew=326)
(1)求该抛物线的解析式;
(2)点
为直线
上方抛物线上的一点,过点
作
轴的平行线交
于点
,过点
作
轴的平行线交
于点
,求
的最大值以及此时点
的坐标;
(3)如图2,将抛物线沿射线
的方向平移,使得平移后的抛物线经过线段
的中点,且平移后抛物线的对称轴与
轴交于点
.
,
是直线
上任意两点,
为新抛物线上一点,直接写出所有使得以点
,
,
,
为顶点的四边形是平行四边形的点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18f3f1fedca00ea4547dc2dbc1fa65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d82c57f58a8e27344f5c5d9d514de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bad49dce359aecfa01863b2fce5dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/374ddbfb-6357-42b8-9a66-cc1e66b72d52.png?resizew=326)
(1)求该抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f3a30d63fde5623d018b4a77231967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,将抛物线沿射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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【推荐2】如图所示,在平面直角坐标系中,抛物线y=ax2+bx+c经过点A(0,4),B(-2,0),C(6,0).过点A作AD∥x轴交抛物线于点D,过点D作DE⊥x轴,垂足为E.M是四边形OADE的对角线的交点,点F在y轴的负半轴上,坐标为(0,-2).
(1)求抛物线所对应的函数表达式,并直接写出四边形OADE的形状;
(2)当点P,Q分别从C,F两点同时出发,均以每秒1个单位长度的速度沿CB,FA的方向运动,点P运动到点O时P,Q两点同时停止运动.设运动时间为t秒,在运动过程中,以P,Q,O,M四点为顶点的四边形的面积为S,求出S与t之间的函数表达式,并写出自变量的取值范围.
(1)求抛物线所对应的函数表达式,并直接写出四边形OADE的形状;
(2)当点P,Q分别从C,F两点同时出发,均以每秒1个单位长度的速度沿CB,FA的方向运动,点P运动到点O时P,Q两点同时停止运动.设运动时间为t秒,在运动过程中,以P,Q,O,M四点为顶点的四边形的面积为S,求出S与t之间的函数表达式,并写出自变量的取值范围.
![](https://img.xkw.com/dksih/QBM/2018/6/10/1963901318111232/1966390209994752/STEM/18a5cb0b5f6141cd82697acf16790b8e.png?resizew=102)
![](https://img.xkw.com/dksih/QBM/2018/6/10/1963901318111232/1966390209994752/STEM/d2402d89257b45adb4592259de675008.png?resizew=95)
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