1 . 在平面直角坐标系
中,已知四边形
是平行四边形,点
,
,点C的纵坐标为
,点D是边BC上一点,连接
,将线段
绕点O逆时针旋转
得到线段
,
给出如下定义:如果抛物线
同时经过点A,E,则称抛物线
为关于点A,E的“伴随抛物线”.
(2)如图2,当点D在边
上运动时,连接
,
①当
取最小值时,求关于点A,E的“伴随抛物线”的解析式;
②若关于点A,E的“伴随抛物线”
存在,直接写出a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff8aff5d2dfbb7d024774a2bb444d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad1b0a76a887783392268ae203ad22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
给出如下定义:如果抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea15998a4a4f4522f571e0d4c91efe02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea15998a4a4f4522f571e0d4c91efe02.png)
(2)如图2,当点D在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
②若关于点A,E的“伴随抛物线”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea15998a4a4f4522f571e0d4c91efe02.png)
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2 . 如图,用
的篙色围成一个边靠墙的矩形场地,墙长
.垂直于墙的边长为
.围成的矩形场地的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/949f1f6f-dea8-47b0-851c-3d6bb5930250.png?resizew=164)
(1)求
与
的函数关系式,并写出自变量
的取值范围;
(2)求这个矩形场地面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c758c27bec97c234d1d818c40f3d3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b749f9acb5f0de709a1709bbdd42614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/949f1f6f-dea8-47b0-851c-3d6bb5930250.png?resizew=164)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求这个矩形场地面积的最大值.
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2022-11-17更新
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185次组卷
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4卷引用:2023年北京市101中学中考模拟数学试题
名校
3 . 某课外活动小组准备围建一个矩形生物苗圃园,其中一边靠墙,另外三边用长为30米的篱笆围成,已知墙长为18米(如图所示),设这个苗圃园垂直于墙的一边长为x米.
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105407280111616/3107387804409856/STEM/ea799b6556e34962aae5059b83944598.png?resizew=163)
(1)直接写出面积S与x的数量关系式并写出自变量的取值范围;
(2)若矩形生物苗圃园的面积为100平方米时,求垂直于墙的一边长为多少米?
(3)垂直于墙的一边长为多少米时,这个苗圃园的面积最大?
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105407280111616/3107387804409856/STEM/ea799b6556e34962aae5059b83944598.png?resizew=163)
(1)直接写出面积S与x的数量关系式并写出自变量的取值范围;
(2)若矩形生物苗圃园的面积为100平方米时,求垂直于墙的一边长为多少米?
(3)垂直于墙的一边长为多少米时,这个苗圃园的面积最大?
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4 . 抛物线
与
轴交于
、
,与
轴交于点
.
(1)求抛物线的表达式;
(2)如图1,
为抛物线对称轴
上一动点,连接
、
,求
的最小值及此时
点的坐标;
(3)如图2,抛物线的对称轴
与
轴交于点
,点
,
为抛物线上一动点,
为抛物线对称轴
上一动点,以点
、
、
、
为顶点的四边形为平行四边形时,直接写出所有可能的点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/415ce7008a89ffca8c3c3edbf13a935e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.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/2023/9/27/ec41de77-c718-4a5e-8d10-6133b7cdcbdc.png?resizew=427)
(1)求抛物线的表达式;
(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd50f7b773530824a9b69a1d57073f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)如图2,抛物线的对称轴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ef6ca06b362b7bc57e1d448a9014c4.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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2022-11-09更新
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268次组卷
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2卷引用:北京师范大学附属中学2022-2023学年九年级上学期期中数学试题
5 . 已知二次函数
.
![](https://img.xkw.com/dksih/QBM/2022/11/5/3103308417187840/3105306965565440/STEM/f4ae621172374486a14d422f0581081f.png?resizew=268)
(1)画出函数图象.
(2)求抛物线的顶点坐标.
(3)求图象与x轴的交点坐标.
(4)求顶点及图象与x轴两交点围成的三角形面积.
(5)当
时,求x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0781a9acdedd45dbdf6855f91ead86.png)
![](https://img.xkw.com/dksih/QBM/2022/11/5/3103308417187840/3105306965565440/STEM/f4ae621172374486a14d422f0581081f.png?resizew=268)
(1)画出函数图象.
(2)求抛物线的顶点坐标.
(3)求图象与x轴的交点坐标.
(4)求顶点及图象与x轴两交点围成的三角形面积.
(5)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
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名校
6 . 某中学课外兴趣活动小组准备围建一个矩形苗圃园,其中一边靠墙,另外三边由长为30米的篱笆围成.已知墙长为18米(如图所示),设这个苗圃园垂直于墙的一边长为x米.
(1)若苗圃园的面积为72平方米,求x的值;
(2)若平行于墙的一边长不小于8米,则该苗圃的最大面积是多少平方米?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/27/7c595c6b-09b0-45bd-a592-2eb7c5afe9bd.png?resizew=121)
(1)若苗圃园的面积为72平方米,求x的值;
(2)若平行于墙的一边长不小于8米,则该苗圃的最大面积是多少平方米?
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2022-11-05更新
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164次组卷
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2卷引用:北京市朝阳区陈经纶中学2022-2023学年九年级上学期数学学科期中测试
7 . 小明用一根长40cm的铁丝围成一个矩形(如图),他发现矩形邻边的长度a,b及面积S是三个变量.有下面三个结论:① b是a的一次函数;② S是a的一次函数;③ S是a的二次函数.其中所有正确结论的序号是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/e035ae4e-efbc-4662-a4f9-4b3aaf437413.png?resizew=159)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/e035ae4e-efbc-4662-a4f9-4b3aaf437413.png?resizew=159)
A.①② | B.①③ | C.②③ | D.①②③ |
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名校
8 . 已知二次函数
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/367f1d70-a353-446d-82b3-cddcb9f8abff.png?resizew=238)
(1)将其化为
的形式____________;
(2)求抛物线的顶点坐标____________;
(3)求图象与y轴的交点坐标____________;
(4)求图象与x轴的交点坐标____________;
(5)画出函数图象;
(6)求顶点及图象与x轴两交点围成的三角形面积____________;
(7)当
时,x的取值范围是____________;
(8)当
时,y的取值范围是____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0135f5b26f24e050b3dc22586785d6bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/367f1d70-a353-446d-82b3-cddcb9f8abff.png?resizew=238)
(1)将其化为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f630e0a99a414cc3fb76464390513a3a.png)
(2)求抛物线的顶点坐标____________;
(3)求图象与y轴的交点坐标____________;
(4)求图象与x轴的交点坐标____________;
(5)画出函数图象;
(6)求顶点及图象与x轴两交点围成的三角形面积____________;
(7)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e747ecc3ec70fba6dcf1921d22881a0.png)
(8)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadb688933b62d30abf8eef479db24d4.png)
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9 . 如图,抛物线
交x轴于点A,C,交y轴于点B,AC=6.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/ca66745b-1a50-4e8f-a40b-3cc3bf873d78.png?resizew=240)
(1)抛物线的解析式;
(2)点P为x轴上一动点,将线段PB绕点P逆时针旋转90°得到线段PD.当点D在抛物线上时,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9c235aed351f695e8f5a90abd8717fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/ca66745b-1a50-4e8f-a40b-3cc3bf873d78.png?resizew=240)
(1)抛物线的解析式;
(2)点P为x轴上一动点,将线段PB绕点P逆时针旋转90°得到线段PD.当点D在抛物线上时,求点P的坐标.
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10 . 如图,在一面靠墙的空地上用长为24米的篱笆,围成中间隔有二道篱笆的长方形花圃,设花圃的宽AB为x米,面积为S平方米.则S与x的函数关系式为_____________ ;花圃面积最大是____________ 平方米.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/a34020f7-d610-4df2-933b-ad384a14e174.png?resizew=238)
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2022-10-09更新
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336次组卷
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3卷引用:北京市海淀区中国人民大学附属中学2022 -2023学年九年级上学期数学第一次月考试卷