1 . 已知抛物线
经过点
,若抛物线
与
的顶点和开口方向都相同,其中
都是实数,且
,求
的函数表达式,并求出当
时,
的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfcd5ab0a3d78750931a5547a5973438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29343388ca8b33dc98325e65382b38a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9fb0c4891916175b546a2d4da16230b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d48dc463d4ee8c24872d2e9527535330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065171a57bc54190862d2d7f653d2eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836d745b71ec18b1135e8bbf6990bffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
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2 . 如图,在平面直角坐标系中,已知二次函数
的图象与
轴交于点
和点
两点,与
轴交于点
.点
为线段
上的一动点.
(2)如图1,求
周长的最小值;
(3)如图2,过动点
作
交抛物线第一象限部分于点
,连接
,
,记
与
的面积和为
,当
取得最大值时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c561d105fe43b1a25ae26f0b6aac73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6486c10ec324649f8100b63829fbbf3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d31c11665576d5ae71a11d8d25d72cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(2)如图1,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e70c6ee9b93371d62c2383fa61b13c1f.png)
(3)如图2,过动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e305fa6e419e4187ccecd395c9d05288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9026fbd7897d459b4d559a4b99f2e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8b1307079384bf7accebda3c826ef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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2024-02-08更新
|
100次组卷
|
2卷引用:安徽省安庆市宿松县2023-2024学年九年级上学期期末数学试题
3 . 已知抛物线
与直线
交于点
.
(1)求抛物线的解析式,并写出它的对称轴和顶点坐标.
(2)对于二次函数
,当
时,
随
的增大而______.
(3)求二次函数
的最大值或最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f3023b526438933a05bed6f671730d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c30fd97fafb3779aa4f4660f41e2939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af21071d48088a22d33bca27c93557f.png)
(1)求抛物线的解析式,并写出它的对称轴和顶点坐标.
(2)对于二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
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4 . 在平面直角坐标系中,抛物线
的顶点为
,抛物线上有两点A、B(点B在点A的右侧),设点A的横坐标为m,点B的横坐标为
.
(1)
______________,
____________;
(2)过点A作y轴的垂线,与抛物线另交于M点,与y轴交于N点.当
时,求线段
的长;
(3)将此抛物线上A、B两点之间的部分(包括A、B两点)记为图象G.
①当图象G对应函数值y随x的增大而先减小后增大时,设图象G对应函数值最大值与最小值的差为d,求d与m之间的函数关系式,并写出自变量m的取值范围;
②以点
为中心作正方形,正方形的边与坐标轴垂直,正方形边长为
,设图象G在正方形内部(包括边界)的左侧最高点到y轴的距离为
,最低点到x轴的距离为
(最高点和最低点不重合),当
时,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d483dd3a65702ed0cd7df766300d03b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26c761c61d4a107a90eddeae185908f.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)过点A作y轴的垂线,与抛物线另交于M点,与y轴交于N点.当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31d1007b8314b51101f44ee0e7666e73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)将此抛物线上A、B两点之间的部分(包括A、B两点)记为图象G.
①当图象G对应函数值y随x的增大而先减小后增大时,设图象G对应函数值最大值与最小值的差为d,求d与m之间的函数关系式,并写出自变量m的取值范围;
②以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7a999c36de5c9a9ce876a4a56fa34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7cc678b7db802124e6ca57eb68a8809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b53eab97158937f92039c1e133b0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f285174fbf90a9742de57c1e53224cff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8224d429df4c0bf1beb041e2cda015d.png)
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5 . 抛物线
与y轴交于点
且过点
,其中
,连接
.
(1)当
时,求抛物线解析式和其顶点的坐标;
(2)当
时,若点M为抛物线
上位于直线
上方的一点,过点M作直线
的垂线,垂足为N.求
的最大值和此时点M的坐标;
(3)已知点
,点
,若点P在线段
上,且
,连接
,
,当
的最小值为
时,直接写出此时b的值和点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba23d524dc2a51f2a2f5a2eec842f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54038e3709e38e1a86fb0bc3980c72fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bd45d81ca9f4fbfdad7642e2016ea11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb80ec1260ba8cfd58074f7d06d9612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a71a658362bd9faa329c3d9f6e6d2c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68abf671ba1bc7cbf2704f1dfde481d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba23d524dc2a51f2a2f5a2eec842f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e66f43e3eaae0440c0a086cd0092ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39de85358f48bc707cf78ce266115be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a7441ff967bfdb11ced2603ecc488a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe5fb32d05389601d8c53df7baaec6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2793aa39b517d1a5e7ca2d8243710c8f.png)
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6 . 已知二次函数
(
为常数).
(1)若二次函数的图象经过点
,求
的值;
(2)在(1)的条件下,当
时,请求出二次函数的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff5fd5ccf8540fc7692b75c5e2ab00c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(1)若二次函数的图象经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6b81924e082b5555467b2dc1f6ca8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120b6dab105ef5caf08a9fffeb8d6e55.png)
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7 . 如图,二次函数的图象与
轴交于
,
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/eab7b571-faf1-4b3f-8a10-8326765287f2.png?resizew=133)
(1)求二次函数的表达式;
(2)当
时,求函数最大值与最小值的差;
(3)点
的坐标为
,点
的坐标为
,若线段
与二次函数图象恰有一个交点,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d71b3cb2a27fbe0d69357431c7575f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ed3c2137215e045c43ece09e725381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d71245877214c05f75574864e32eba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/eab7b571-faf1-4b3f-8a10-8326765287f2.png?resizew=133)
(1)求二次函数的表达式;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120b6dab105ef5caf08a9fffeb8d6e55.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c983c8a71d1ba8a810b8d34e6164e6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c9fc97e2bf0c90a64db6f7f9b2161c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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8 . 综合与实践课上,老师让同学们以“抛物线中三角形面积”为主题开展数学活动.
【问题背景】
在平面直角坐标系中,A、B、C的坐标分别是
、
、
,抛物线
经过A、B、C,点D坐标是
,点P是抛物线上位于x轴上方一点.
(1)若
,
①求a、b、c的值;
②求
面积的最大值.
【一般化思考】
(2)①对于每一个正数m,
面积都存在最大值,试用含m的代数式表示
最大面积S;
②在①的条件下,试探究:
的最大面积S是否存在最小值?若存在,求出S的最小值;若不存在,请说明理由.
【问题背景】
在平面直角坐标系中,A、B、C的坐标分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b3c94d505e7c5bcce94afec4af3d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3726021850f5b937bf61783869b4d68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fed700b7a3ab2ee7fbae12507033af9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7ede0702d2c873101e9564545d9d3c.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3cc8c48bf54ec8252e5dce6867754.png)
①求a、b、c的值;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
【一般化思考】
(2)①对于每一个正数m,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
②在①的条件下,试探究:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
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9 . 已知
是
的二次函数,表中列出了部分
与
的对应值:则该二次函数有__________ (填“最小值”或“最大值”).
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![]() | 0 | 1 | 2 |
![]() | 0 | 1 | ![]() |
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10 . 二次函数
的图象与x轴交于A、B两点,与y轴交于点C,自变量x与函数值y的部分对应取值如表:
(1)请选择你喜欢的方法求二次函数
表达式;
(2)如图1,点D为线段
的中点,点 E为线段
上任意一点,将线段
绕点D顺时针旋转
得到线段
,连接
.
①求
面积的最大值;
②直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
x | … | 2 | … | |||||
y | … | 0 | 0 | … |
(1)请选择你喜欢的方法求二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
(2)如图1,点D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7f8a812e8164cc7f2e4cfba0a406a1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/61566594-3162-4c3e-a029-6852e48c728e.png?resizew=308)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc869125145c0139d92490a41bd3918.png)
②直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b794583f1d7892bb4c34918539cb753e.png)
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