1 . 如图,在平面直角坐标系中,平面内有一动点
,定点
、
,连结
._________ ;(填“是”或“否”)
(2)若点P只是在第一象限内运动,过点P作
于Q,当
取得最大值时,点P的坐标是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae5b3f682841d4bf4a46fcd1ba5949a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6938eeb65411eeac15e140cf1db99773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若点P只是在第一象限内运动,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
您最近一年使用:0次
2024-04-08更新
|
71次组卷
|
2卷引用:江苏省无锡市宜兴市桃溪中学2023-2024学年九年级下学期第一次月考数学试题
2 . 阅读与思考
请阅读下列材料,并完成下列任务.
任务:
(1)对于函数
,当
等于___________时,函数
有最___________值(填“大”或“小”),这个值是___________;
(2)对于函数
,当
等于___________时,函数
有最___________值,这个最值是___________;
(3)某植物园利用一面足够长的围墙和木栏围成一个矩形花圃,中间用一排木栏隔开,如图所示,总共用了100米的木栏,当
长为多少时,矩形花圃
的面积最大?最大面积是多少?请你利用材料中的结论或所学知识求解该问题.
请阅读下列材料,并完成下列任务.
问题背景: 数学兴趣小组的同学们在学习了完全平方公式之后,发现由于 ![]() ![]() 探索发现: ![]() ![]() ![]() ![]() ![]() 发现结论:如果 ![]() ![]() ![]() 解释证明: 当 ![]() ![]() ![]() ![]() 当 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
(1)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9a70fee672088fd1d95755ffd0b504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee0d797423083236239a6c97c0f49ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(3)某植物园利用一面足够长的围墙和木栏围成一个矩形花圃,中间用一排木栏隔开,如图所示,总共用了100米的木栏,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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3 . 如图,在平而直角坐标系中,二次函数
的图象与
轴分别交于点
,顶点为
.连接
,将线段
绕点
按顺时针方向旋转
得到线段
,连接
.点
分别在线段
上,连接
与
交于点
.
,
的坐标;
(2)随着点
在线段
上运动.
①
的大小是否发生变化?请说明理由;
②线段
的长度是否存在最大值?若存在,求出最大值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5058e158c93a35691db9b2c7ca0ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9cda46e575acf64941ea0964b89ee99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb28ac2ec9b8d86d468e4f28377fdba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5191fd3625bf6bd3744807e3ccdb030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a657ad89fde6f1175394697852e266e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4283ab02acdf80f9b425aa1df08ee6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec9859da9c5171f917df44e444fd7b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)随着点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1428d4a45e569bc6e39005ea3c9c8ec0.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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4 . 在
中,
,
是锐角,若
,且
,则
面积的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3b37c1b382628dc3ab9f0a97c80b4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e8f6faf46c448fe8d838fde1af495b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd6a9b103299a6ccb134bb8044038e8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
5 . 如图,二次函数
的图像与坐标轴分别交于点
、
、
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/51ecb140-4b72-4c20-88a9-2694ea593c7c.jpg?resizew=116)
(1)求二次函数表达式;
(2)在第二象限内,线段
上有一点
,作
平行于
轴,交二次函数图像于点
、
(点
在
轴左侧),作点
与点
关于
轴对称.
①证明:四边形
为平行四边形;
②若
是以
为斜边的直角三角形,求点
的横坐标;
③直角坐标系内存在点
,使得四边形
为平行四边形,请直接写出
与
的函数表达式,并求当线段
的长度最大时,点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a31bc26ae2a56d4d19789fd3c03ac1.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabc0c09bbd8e947818b688c5522a70f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8483716cbca039fc01c24104b59173dd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/51ecb140-4b72-4c20-88a9-2694ea593c7c.jpg?resizew=116)
(1)求二次函数表达式;
(2)在第二象限内,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
①证明:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d5e1fb25f64554171a4a4aaf03c7740.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a1eda00fc2d64ce3a42004b24adf00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
③直角坐标系内存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6fd4d22c1e2c564bf2bdc5ae894de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32c88c67d9a061d5ce7743d97c6d7d1.png)
![](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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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解题方法
6 . 在平面直角坐标系中,一次函数
的图像与x轴交于点A,与y轴交于点B,二次函数的图像
经过点A、B.
(2)如果
,点P是直线AB下方抛物线上的一点,过点P作PD垂直于x轴,垂足为点D,交直线AB于点E,使
.
①求点P的坐标;
②直线PD上是否存在点Q,使△ABQ是以AB为斜边的直角三角形?若存在,求出符合条件的点Q的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37efb179686525e1a0aec162008f605.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ee682e84c4868ecc516f8b48ad6844.png)
①求点P的坐标;
②直线PD上是否存在点Q,使△ABQ是以AB为斜边的直角三角形?若存在,求出符合条件的点Q的坐标;若不存在,请说明理由.
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名校
7 . 如图1,平面直角坐标系xOy中,抛物线与x轴分别交于点
和点
,与y轴交于点C,P为抛物线上一动点.
(1)写出抛物线的对称轴为直线_______,抛物线的函数关系式为______;
(2)如图2,连结AC,若P在AC上方,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24f27083267432a9352fb6677a07d461.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ed1d83bab22b644e0331b4ae123c9e.png)
(3)若P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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8 . 如图,在中,
,
是
边上任意一点,分别做点
关于
,
的对称点
,
,以
,
为邻边作
,边
交
于点
,则
的最小值为
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9 . 如图,抛物线
过
,
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/e4f0963a-915b-439b-9d9f-39d75dd5453f.png?resizew=551)
(1)求该抛物线的解析式;
(2)点
是抛物线上一点,且位于
的上方,当
的面积为6时,求点
的坐标;
(3)过
作
于
,连接
,点
是抛物线上一点,当
时,请求出此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53be61cd85ec86aabd164cae0265246b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823099d18b79aad79a43d30704291aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54091bb290b92af171da703aebb72b91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/e4f0963a-915b-439b-9d9f-39d75dd5453f.png?resizew=551)
(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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad481ad2a1a3126e20ead668ce4131ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19523646835c73a4a7d78b7269e109b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
您最近一年使用:0次
10 . 综合与探究
如图,正方形
中,
为边
上异于
的一动点,
为边
上一点,
为线段
上的动点,
于
,
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/94fa5df1-4230-43b2-b306-8f599a5dd27a.png?resizew=284)
(1)求证:
;
(2)若
为
中点,设
为
.
①求
的长(用含
的代数式表示);
②求四边形
面积的最大值;
(3)当
点固定时,试证明四边形
面积随着
的增大而增大.
如图,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ba61f50c7429166adadf8fa21c3627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6b93dbe5272a5167ff4e2918bec864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee02142f5ceee590f89f9514d06764b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf193ff4546dfb09008d6354f374b280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111bed54588191f89034614bb8ca242f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/94fa5df1-4230-43b2-b306-8f599a5dd27a.png?resizew=284)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c3316975ecd3a43058c29ed0a8e0fb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7168c9b611be134a7a2752aff9d7261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52596d1b1c75eddf354670618371992.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52596d1b1c75eddf354670618371992.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
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