1 . “距离”是数学研究的重要对象,如我们所熟悉的两点间的距离.现在我们定义一种新的距离:已知
是平面直角坐标系内的两点,我们将
称作P,Q间的“L型距离”,记作
,即
.
已知二次函数
的图像经过平面直角坐标系内的
三点,其中
两点的坐标为
,点C在直线
上运动,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/17ef7e39-e478-4bb3-bba1-06514346da6b.png?resizew=232)
(1)求
;
(2)求抛物线
的表达式;
(3)已知
是该坐标系内的一个一次函数.
①若
是
图像上的两个动点,且
,求
面积的最大值;
②当
时,若函数
的最大值与最小值之和为8,求实数t的值.(补充两点间距离公式:平面直角坐标中两点
),则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/149a674889feb21c14b0b2e2a283e2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246992907770b9bcc1d440e40c470672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039117b0719bf52566a61aef678ba4f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299b9bac601f39e919ee629c14b775ed.png)
已知二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c536b68b1855a7ab75708a70520133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba947e560a7dd52c18be650a70b04370.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/17ef7e39-e478-4bb3-bba1-06514346da6b.png?resizew=232)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6159b65365685e6bf57f2a31d4d3fcf4.png)
(2)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70fa1a222604d68a01c25814d92c92e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70fa1a222604d68a01c25814d92c92e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f341b98caabf99bc683ce8407068735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba473d8259b0d54c0bc617d07aea6cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/845a73eeb5503d7b95dafee8dd0fece8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79731d87051083b6669c114d7bf77952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac72365d436a7e713363cf65fb5e06c.png)
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2 . 已知抛物线
的对称轴是直线
,且过点
.
(1)求这个二次函数的表达式;
(2)x在什么范围内,y随x增大而减小?该函数有最大值还是有最小值?求出这个最值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57d7b620c88723dbce7a65302a9dff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d2b01f86fb5a373af6b089cf3d891b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f294b306dfc5fb7fd654365eb404f3.png)
(1)求这个二次函数的表达式;
(2)x在什么范围内,y随x增大而减小?该函数有最大值还是有最小值?求出这个最值.
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3 . 如图,抛物线
与x轴交于
,
两点,与y轴交于点C.
(1)求抛物线的解析式及点C的坐标;
(2)若点P在直线
下方的抛物线上,过点P作
交
于点D,求
长度的最大值;
(3)当
时,y的最大值与最小值的和是
,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/e55ae544-874a-42f9-97fc-de48e0527e13.png?resizew=151)
(1)求抛物线的解析式及点C的坐标;
(2)若点P在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e6d3c87c2ba2a7dd6f23f33290a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eba4e789b6ca08e886bc389b2572560f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
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2卷引用:湖北省襄阳市襄州区2023-2024学年九年级上学期期中数学试题
4 . 已知二次函数图象的顶点坐标是
,且经过点
.
(1)求该二次函数的解析式;
(2)当
时,求此函数的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab4312af0bb0c72d548a13a74c8265b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ec21e660222f593dc2ec2175dd03e9.png)
(1)求该二次函数的解析式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ac8ebedafa300c895540c5e5dda755.png)
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5 . 已知二次函数的对称轴为直线
,且过
和
两点.
(1)写出此二次函数解析式;
(2)求出这个函数的最大值或最小值;
(3)当x为何值时,y随x增大而增大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d2b01f86fb5a373af6b089cf3d891b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de0329cd0d5164adbdaf97d0f5f758a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b129015e06e419db146ed73c08c567bf.png)
(1)写出此二次函数解析式;
(2)求出这个函数的最大值或最小值;
(3)当x为何值时,y随x增大而增大.
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6 . 如图所示,抛物线
与直线
交于
,
两点,点
为线段
上一动点,过点
作
轴的垂线交抛物线于点
..
(2)当点C运动到何处时,线段
的长度有最大值;
(3)点E为直线
上一动点,在(2)的条件下,当
有最小值时,点E的坐标为______(直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6630ab76c11cf9d3368f9f2dc4f63d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557437a8641a61bf64c1e40f2bbf72a6.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)当点C运动到何处时,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)点E为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3be4f273c130f2f8cadc4cce8a9fdea.png)
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7 . 如图,在平面直角坐标系中,抛物线
与
轴交于
,
两点,与
轴交于点
,点
为直线
上方抛物线上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/bf3428f6-ef67-46d1-8418-e7152b0cc145.png?resizew=363)
(1)求抛物线的解析式;
(2)过点
作
交抛物线于
,若点
为对称轴上一动点,求
周长的最小值及此时点
的坐标;
(3)过点
作
交抛物线于
,过点
为直线
上一动点,连接
,
,求四边形
面积的最大值及此时点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18269e4b2c08f69b719c4c7e7d71733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/158f5a581695399f6ffdf65110dec692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf2e8efae32e20217703345b1375f8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/21/bf3428f6-ef67-46d1-8418-e7152b0cc145.png?resizew=363)
(1)求抛物线的解析式;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fbad473c16df3ff62c1c6b37de6aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd66fb9318a6be241f5029ab0588cb81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79499d07e7ce730eacb7a471a0f3df43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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8 . 如图,已知二次函数
的图象经过点
,点
.
(1)求该二次函数的表达式,并求出对称轴和顶点坐标;
(2)点
在该二次函数图象上,当
时,
的最大值为
,最小值为1,请根据图象直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab47bf43b2c5d6395129b80ddfbb1b24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93842cf36b1107534c3904d18ba3ae5c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/e0ad210a-3b4b-4a28-90b5-3e69159c630d.png?resizew=156)
(1)求该二次函数的表达式,并求出对称轴和顶点坐标;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5356182cc3bc478f7c2e3e6dee25e58d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15bb38495bfc76f0641e7ca6fa7e32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b794e0a6819661582e25ab74e1009a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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名校
9 . 已知二次函数
的图象过点
,点
和点
.
(1)若点
,求二次函数表达式;
(2)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b0cfe33a89db1c3c848b27fd6031c9.png)
①当
时,求
最大值与最小值的差(用含
的代数式表示)
②证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8c639c851e0044ee22020324c5570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7480deb6fedddf1fb05d8cdb24be1703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c43f704b5d150cb4e29e9796a07d80.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b0cfe33a89db1c3c848b27fd6031c9.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4997176b91a2d4a396e6f5d36510fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9457ea96205b652a136dbd422b3142.png)
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5卷引用:浙江省温州市龙湾区龙湾区海城中学2023-2024学年九年级上学期期末数学试题
浙江省温州市龙湾区龙湾区海城中学2023-2024学年九年级上学期期末数学试题浙江省温州市温州龙湾、瑞安 32023-2024学年九年级上学期12月月考数学试题浙江省温州市瑞安市西部联盟联考2023-2024学年九年级上学期12月月考数学试题(已下线)专题13 二次函数的图象与性质(十五种考法)-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(北师大版)(已下线)专题08确定二次函数的表达式(1个知识点4种题型1个易错点)-【帮课堂】2023-2024学年九年级数学下册同步学与练(北师大版)
10 . 在平面直角坐标系中,二次函数
(b、c为常数)的图象经过点
和点
.
(1)求这个二次函数的表达式.
(2)当
时,二次函数
的最大值与最小值的差为1,求
的取值范围.
(3)当
时,设二次函数
的最大值与最小值的差为
,求
与
之间的函数关系式.
(4)点
在直线
上运动,若在坐标平面内有且只有两个点
使
为直角三角形,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/241ce9bd28046ce9b90f43b391132884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27149c9ff20937492950f42084caa019.png)
(1)求这个二次函数的表达式.
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21cd6cf5ee9b8dcefb49e4d41ea3058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dba441a3bf4e0bc6b6d47cd8c11da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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