1 . 已知抛物线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/c35a5cad-b555-4f88-b340-a73a8f111257.png?resizew=170)
(1)图象的开口方向为________,对称轴是________,顶点坐标是________.
(2)分别求出抛物线与x轴,y轴的交点坐标.
(3)在给出的平面直角坐标系中,描出(1)、(2)中的点和线,并画出抛物线的大致图象.
(4)观察图象:当
时,
的取值范围为________.请推测,当
时,
的最小值为________,最大值为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad32086fb2332ce3b7a4779c188f0546.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/22/c35a5cad-b555-4f88-b340-a73a8f111257.png?resizew=170)
(1)图象的开口方向为________,对称轴是________,顶点坐标是________.
(2)分别求出抛物线与x轴,y轴的交点坐标.
(3)在给出的平面直角坐标系中,描出(1)、(2)中的点和线,并画出抛物线的大致图象.
(4)观察图象:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddb5d6e0b5580ae4e270aa93e9efd07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdcbe8feb962c6a6d973b2f8feabd28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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名校
2 . 若
是非负数,且
,
的最大值为
,最小值为
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8811c6815297157f993631f559b7457e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd62a06d2eaed73b02a862a0061b129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b0f3b9cbe903b9be4f643571a3fca4e.png)
A.![]() | B.10 | C.![]() | D.![]() |
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3卷引用:湖北省部分学校2023-2024学年九年级上学期数学试题
湖北省部分学校2023-2024学年九年级上学期数学试题(已下线)易错03+函数及其图象2(九大易错分析+避坑大招+学以致用+易错题通关)-备战2024年中考数学考试易错题(全国通用)广东省广州市铁一中学2023-2024学年九年级下学期月考数学试题
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解题方法
3 . 已知抛物线
与
轴相交于A、B两点(点A在点B右侧),与
轴相交于点C,点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/5a86f456-5269-4403-9a20-814869845904.png?resizew=302)
(1)求抛物线的顶点坐标;
(2)若点
是第二象限内抛物线上一动点,过点
作线段
轴,交直线
于点
,当线段
取得最大值时,求此时点
的坐标.
(3)若取线段
的中点
,向右沿
轴水平方向平移线段
,得到线段
,当
取得最小值时,求此时点
的坐标
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e21b859aa2b074e8c13711320c414a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4218690b49de906a22dda72c578956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/5a86f456-5269-4403-9a20-814869845904.png?resizew=302)
(1)求抛物线的顶点坐标;
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b1da9046b4cb82135a4a1eaa528c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若取线段
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7737c6ad84234464b8cd1a72f7a5c5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b365dbf8d6b88157a7cba9fb1bc120e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
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2卷引用:湖北省武汉市华中科技大学附属中学2023-2024学年九年级下学期开学考试数学试题
名校
4 . 已知抛物线
与
轴交于
、
两点,与
轴交于点
.
(1)当
且
.
①求抛物线的解析式.
②若
,且
,
的最大值和最小值分别为
,
,且
,求
的值.
③若该抛物线经过
,
两点,且
,求
的取值范围.
(2)当
时,函数
有最小值
,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f31990451834666d7d601864460f826.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)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5abc4464f8c0424a6c896617321757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391cd02284849a43ded9108bfa4bee2c.png)
①求抛物线的解析式.
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef666e48a29520926ceaff9066fe26f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15426cf8d2c03ab6576bcea55412de5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b70d4a3fc3e01b5a6358cf4e57578e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
③若该抛物线经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ca2f86d45d1230d37c46ca9196730c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da14ddfb4d47cf94b48513daa17d0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74943998de9d2f01db322995523dd2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f31990451834666d7d601864460f826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1e94f660b7d05de4be4b5fbd9041f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2卷引用:2022年湖北省宜昌市天问教育集团校中考模拟数学试题
23-24九年级上·湖北·周测
5 . 已知抛物线
经过点
,与
轴交于点
,顶点
在直线
上.如图1,若点
的坐标为
,点
的横坐标为1.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/d06e4a1a-2e1b-496c-b0c8-47bd98fa5366.png?resizew=142)
(1)试确定抛物线的解析式;
(2)若当
时,
的最小值为2,最大值为11,请求出
的取值范围;
(3)已知:点
在抛物线上,点
的坐标为
,且
,请直接写出符合题意的点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c6155a8a04ffd4c305add626074fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/d06e4a1a-2e1b-496c-b0c8-47bd98fa5366.png?resizew=142)
(1)试确定抛物线的解析式;
(2)若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15bb38495bfc76f0641e7ca6fa7e32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知:点
![](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/3654254401fc902c3cb4912969f21f88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433fd60ef60e81fd999fbf2e95c8cf52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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6 . 如图,在平面直角坐标系中,二次函数
的图像 与x 轴交于
,
两点,与y 轴交于点C .
(2)点P是直线
下方抛物线上的一个动点,连接
,线段
与
交于点 Q,设
的面积为
,
的面积为
,当
取最大值时,求点P的坐标;
(3)当
时, 二次函数的最大值与最小值的差是一个定值,请直接写出m 的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33afa8924f1af256a77d53e2ec2ba539.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0d256036d52b784b8c68bfc8db69d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fec0bc3a43265b63b6964476ca327fab.png)
(2)点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb7f6671691385e2caf3fcc4f41db56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c499b1f470978c4f8cc05ffdebc2e961.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92905d020164683947943040ec19c530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38c43d922840f5f7693007beeb62b34.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a166d7120c23808aeb98e3109e00337.png)
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3卷引用:2024年湖北省襄阳市谷城县中考一模数学试题
7 . 如图,已知抛物线
与x轴交于点
,点
,与y轴交于点C.
(1)求抛物线的解析式;
(2)当
时,求二次函数
的最大值和最小值;
(3)点P是第一象限抛物线上一动点,过点P作x轴的垂线l,交
于点H,连接
,
,求
面积的最大值及此时点P坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7706e60c7eb1d50efa10c291d7b936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a57a170489b8ccdbf2886a08ccde4b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/09634a38-2691-4145-bc18-b8dd21ab0f6e.png?resizew=274)
(1)求抛物线的解析式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
(3)点P是第一象限抛物线上一动点,过点P作x轴的垂线l,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
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8 . 已知抛物线
.
(1)图象的开口方向为_______,对称轴是_______,顶点坐标是_______.
(2)分别求出抛物线与x轴,y轴的交点坐标.
(3)在给出的平面直角坐标系中,作出(1)(2)中的点和线
(4)观察图象:当
时,x的取值范围为_______;当
时,y的最小值为_______,最大值为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85162d1cd39d9dfeded3862797ca28cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/2204458c-4ba7-4f68-87b3-426a586086e4.png?resizew=218)
(1)图象的开口方向为_______,对称轴是_______,顶点坐标是_______.
(2)分别求出抛物线与x轴,y轴的交点坐标.
(3)在给出的平面直角坐标系中,作出(1)(2)中的点和线
(4)观察图象:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0688010667132bf32072c4340c0169e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f15586e5089aea9aad6dfe0ee9fc4f.png)
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9 . 已知二次函数
,
,
,
为常数)的对称轴为
,其图象如图所示,则下列选项正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4f7d5a5627d6133810fedde1d0d0b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/98fbe8ff-3bd2-43c2-897a-b7fe0f074bb4.png?resizew=175)
A.![]() |
B.当![]() ![]() |
C.关于![]() ![]() ![]() ![]() |
D.若关于![]() ![]() ![]() ![]() ![]() |
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2023-10-24更新
|
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2卷引用:2021年湖北省武汉市洪山区华中师大一附中自主招生数学试题
10 . 关于x的二次函数
,在
时的最大值与最小值的差大于15,则m的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d05a8dc7e228b86d4caa72259c14a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a12a30935c79ae769818043a496f53.png)
A.![]() | B.![]() ![]() |
C.![]() | D.![]() |
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