1 . 已知二次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee4acbd3bdef88e7164284b0bf64147.png)
(1)若
当
时,y的最小值为
y 的最大值为4,求
的值;
(2)若该二次函数的图象经过点
和
, 当
时,y的最大值与最小值的差8,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee4acbd3bdef88e7164284b0bf64147.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb1c5e4f983365c4f72909ceba04426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44261bc6891f81e7188662800427d768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ec353a5e5427bb24b1d63a813dd349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(2)若该二次函数的图象经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93446e0105a1e10b9ae4583b0fb15e7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de56d797a450af3ed7ef6b4c9027c299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2978de5f539920fd53703b3368d934.png)
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2 . 如图1,在平面直角坐标系中,抛物线
与x轴分别交于
两点,与y轴交于点
,顶点为点G,连接
,点P为直线
上方抛物线上一动点,连接
交
于点M.
(2)当
的值最大时,求点P的坐标及
的最大值;
(3)如图2,在(2)的条件下,
是此抛物线对称轴上长为2的一条动线段(点E在点F上方),连接
,当四边形
周长取最小值时,求点E的坐标;在此条件下,以点G、E、H、P为顶点的四边形为平行四边形,直接写出点H的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe5d9a2ed71c5a959838ce4c3457f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b0c3cc887ec123499d4ea8a0870ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ed1fce01430ae31294c29d626626f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a6ce188523ed6ab24fa2bfa6e17fdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a6ce188523ed6ab24fa2bfa6e17fdb.png)
(3)如图2,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9061c29abeb16ec9b9a43a8045e7b5f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
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2024-03-16更新
|
222次组卷
|
3卷引用:2023年广西梧州市长洲区中考一模考试数学试题
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 . 如图,抛物线
交x轴于点
,
,交y轴于点C,点M在抛物线上,横坐标为m,将抛物线M,C两点间(含M,C两点)的部分记为图象W.
(2)若图象W的最大值与最小值的差为4,求m的值;
(3)若点M位于
下方,过点A作
交拋物线于点E,D为直线
上一动点,连接
,
,
,
,求四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7291b3d921f595f28960abcdce6dfbed.png)
(2)若图象W的最大值与最小值的差为4,求m的值;
(3)若点M位于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe970a64836eadeccfd36106c2fbf07.png)
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5 . 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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2024·云南昆明·一模
名校
6 . 已知抛物线
(实数a为常数)的对称轴为直线
.
(1)求抛物线的函数关系式;
(2)记x在某个范围时,函数y的最大值为m,最小值为n,当
时,则
,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd5eced69dd854b8cba28c3646ff53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
(1)求抛物线的函数关系式;
(2)记x在某个范围时,函数y的最大值为m,最小值为n,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba473d8259b0d54c0bc617d07aea6cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2f719e5cdc3a82cd4ce5619a6e6812.png)
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7 . 如图1,在平面直角坐标系中,抛物线
与x轴交于A、B两点,与y轴交于C点,顶点D的坐标为
,点P是第一象限抛物线上的一动点.
(2)如图2,连接
、
、
,线段
与
相交于点E,设
则w有最大值还是最小值?请做出判断,并求出w的最值.
(3)如图3,点Q为第四象限抛物线上的另一动点,连接
交y轴于点H,线段
与y轴的交点记为G,用m表示
的长,用n表示
的长,若在P、Q两点运动的过程中,m与n始终满足函数关系式
试探究直线
是否过某一定点.若是,请求出该定点的坐标;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5a83884d3544796f802166be2717c4.png)
(2)如图2,连接
![](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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9461bc4e528e1d487ba601f7e3bb52b.png)
(3)如图3,点Q为第四象限抛物线上的另一动点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390629ac6b9ec8c150825d062cf2f363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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8 . 如图1,在平面直角坐标系中,抛物线
与x轴交于点A,B(点A在点B的左侧),交y轴于点C,点A的坐标为
,点D为抛物线的顶点,对称轴与x轴交于点E.
(2)连接
,点M是线段
上一动点(点M不与端点B,D重合),过点M作
,交抛物线于点N(点N在对称轴的右侧),过点N作
轴,垂足为H,交
于点F,点P是线段
上一动点,当
的周长取得最大值时,求
的最小值;
(3)在(2)中,当
的周长取得最大值时,
取得最小值时,如图2,把点P向下平移
个单位得到点Q,连接
,把
绕点O顺时针旋转一定的角度
,得到
,其中边
交坐标轴于点G.在旋转过程中,是否存在一点G,使得
?若存在,请直接写出所有满足条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e71461c5134339b5b54a80e588640f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b3c94d505e7c5bcce94afec4af3d92.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee50a23604ea2a9c1f3649dab97c2e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/150cbaad560246d84e6411c69dfb6718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33181b27b10690b4913595f8c1f46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d830ff97422da8d6d4911ef6f22af4.png)
(3)在(2)中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33181b27b10690b4913595f8c1f46e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d830ff97422da8d6d4911ef6f22af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18483c9c195ecd922772527fa85c0fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831c4fbec375b0bfc8258ed9b1a81ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d01f5c4d4177269ecb4b323defa063a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50876b3f3f74193245abaa84262ecee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f159bdf3e82d6b58ad696ed844ab6d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94a5ff197dc688cc8cd754154c152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
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9 . 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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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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