1 . 兴农农场准备利用如图所示的直角墙角(两边足够长),用
长的篱笆围成一个矩形家禽养殖场
(篱笆只围
,
两边),并在
,
两边上各开一个
宽的门,设
,养殖场的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/4f1a3a86-a6c3-40e7-a0d9-6adeb1bc33a6.png?resizew=168)
(1)求
关于
的函数表达式;
(2)求
的最大值;
(3)若在直角墙角内点
处有一水池,且与墙
,
的距离分别是
,
,要将这个水池围在矩形养殖场内(含边界,不考虑水池的尺寸),则养殖场的面积能否为
?若能,求出
的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8badcdb1e5621f0ac4d9272041185a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ee18c1ab349ebab9ecd692a1dc07d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baaa2d65026770c5505f8adeb450e43b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/4f1a3a86-a6c3-40e7-a0d9-6adeb1bc33a6.png?resizew=168)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)若在直角墙角内点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167e6e41ac221847824a72e964f340f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c08094f72d5bd69246c453dd28e33d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e747a4f096e95d2e1d6a48ec5fbb13cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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2 . 小明用一根8米长的绳子围成一个矩形,设其中一边长为x米(
),矩形的面积为y平方米,解答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/6a65a696-ea4b-4c3f-aba2-891733d8d8d0.png?resizew=109)
(1)写出y与x的函数关系式;
(2)小明想围成的矩形面积最大,请你帮他算一算当x是多少时面积最大?最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afeccf0358c02b53554a0f6d3dc33cbd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/6a65a696-ea4b-4c3f-aba2-891733d8d8d0.png?resizew=109)
(1)写出y与x的函数关系式;
(2)小明想围成的矩形面积最大,请你帮他算一算当x是多少时面积最大?最大面积是多少?
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3 . 如图,利用长度为
的篱笆,围成中间隔有一道篱笆的长方形的花圃,且花圃的长可借用一段墙体(墙体的最大可用长度
),墙体侧不多围篱笆.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/4ce37699-9e04-4e46-9d7c-d3ec95928c90.png?resizew=181)
(1)如果所围成的花圃的面积为
,试求宽
的长度;
(2)按题目的设计要求,能围成面积比
更大的花圃吗?如果能,请求出最大面积,并说明围法;如果不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa95874b57afccaf193c257d437e5a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e650b66c7c2fabe36674bc9770a66fdd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/4ce37699-9e04-4e46-9d7c-d3ec95928c90.png?resizew=181)
(1)如果所围成的花圃的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60855913ae2e3f3b722d20592d893612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)按题目的设计要求,能围成面积比
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60855913ae2e3f3b722d20592d893612.png)
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2023-12-21更新
|
320次组卷
|
2卷引用:湖南省长沙市一中集团联考2023-2024学年九年级上学期期中数学试题
名校
4 . 如图,某单位准备将院内一块长
米、宽
米的长方形空地,建成一个矩形花园,要求在花园中修建两条纵向和一条横向的小道,剩余的地方种植花草.(注:所有小道进出口的宽度相等.)
(1)设小道进出口的宽度为
米,种植花草的面积为
平方米,则
与
之间的函数表达式为____________
(2)当种植花草的面积为
平方米时,那么小道进出口的宽度为多少米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/99c3ed50-405a-4b82-a0fd-aca46594ff72.png?resizew=193)
(1)设小道进出口的宽度为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当种植花草的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/563ca0f77e21d2d5f60da351936c1bce.png)
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5 . 如图,在足够大的空地上有一段长为24米的旧墙
,某人利用旧墙和木栏围成一个矩形菜园
,其中
,已知矩形菜园的一边靠墙,另三边一共用了60米木栏.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/817574bf-6733-4c71-be42-20d9c6485cc1.png?resizew=214)
(1)若围成的矩形菜园的面积为400平方米,求所利用旧墙
的长;
(2)求矩形菜园
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b26c112faf0e59cb6294f591dcb6155.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/817574bf-6733-4c71-be42-20d9c6485cc1.png?resizew=214)
(1)若围成的矩形菜园的面积为400平方米,求所利用旧墙
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求矩形菜园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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2023-12-06更新
|
154次组卷
|
2卷引用:湖南省郴州市桂阳县2023-2024学年九年级上学期月考数学试题
名校
6 . 如图,四边形
中的两条对角线
,
互相垂直,
,当
为______ 时.四边形
的面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18670a76edf5a4c32a34021a4ae3feef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/c0e1ae0f-8c28-432b-a9a4-a7087483c76d.png?resizew=171)
您最近一年使用:0次
2023-10-21更新
|
118次组卷
|
3卷引用:湖南省长沙市浏阳市2023-2024学年九年级上学期期中数学试题
名校
7 . 如图所示,已知平行四边形
的周长为
,
,若边长
.
(1)写出
的面积
与x的函数关系式,并求自变量x的取值范围.
(2)当x取什么值时,y的值最大?并求最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19daa2b38e3a52bd7096d235c843110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691048ce61c91a8a3680fa3025193160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/fcd9296a-49eb-497c-a1c4-3b6dbf2c602c.png?resizew=185)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eacd892f03da01942140679667792250.png)
(2)当x取什么值时,y的值最大?并求最大值.
您最近一年使用:0次
名校
8 . 定义:关于
轴对称的两条抛物线叫做“同轴对称抛物线”.
例如:
的“同轴对称抛物线”为
.
(1)求抛物线
的“同轴对称抛物线”.
(2)如图,在平面直角坐标系中,点
是抛物线
上一点,点
的横坐标为1,过点
作
轴的垂线,交抛物线
的“同轴对称抛物线”于点
,分别作点
、
关于抛物线对称轴对称的点
、
,连接
、
、
、
.
①当四边形
为正方形时,求
的值.
②在①的条件下,抛物线
的“同轴对称抛物线”的图像与一次函数
相交于点
和点
(其中
在
的左边),将抛物线
的“同轴对称抛物线”的图像向上平移得到新的抛物线
与一次函数
相交于点
和点
(其中
在
的左边),满足
,在抛物线
上有且仅有三个点
、
、
,使得
、
、
的面积均为定值
,求
、
、
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907ac10b3656189054ab37f707e126a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53da0fb72cda7ba82d3eb33f7ab7400e.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/161827d11b1959935b1353f311872e55.png)
(2)如图,在平面直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6272c4300ad2624e651270b6701a42d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
①当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bc51695e51aa8cd2f97d220c8f5340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
②在①的条件下,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982a0b3c45d323e81d25b2d8efa089a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf90af48c665ee801c05cc55914b8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c4640b2bee411935f588fc5433c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db6954aabaddfc79ab4a7cec5f88109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbbf0eec8bbfe86dbd49253f76fbc104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb24f987547a8e3cc378647b23882447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c4640b2bee411935f588fc5433c74.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/4954e3d2-57d1-44ac-a4ce-55bd088300e9.png?resizew=224)
您最近一年使用:0次
名校
9 . 已知抛物线
与x轴交于点
和
,与y轴交于点C.
(1)求抛物线的表达式;
(2)如图1,点P是线段
上的一个动点(不与点B,C重合),过点P作x轴的垂线交抛物线于点Q,联结
,当四边形
恰好是平行四边形时,求点Q的坐标;
(3)如图2,在(2)的条件下,D是
的中点,过点Q的直线与抛物线交于点E,且
,在直线
上是否存在点F,使得
与
相似?若存在,求点F的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52ba7220d048fba7997abb73a2dfb16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/d050b139-2173-4d1e-80e3-146dee879cbc.png?resizew=239)
(1)求抛物线的表达式;
(2)如图1,点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af77beff7c8589189f6de735162c2b57.png)
(3)如图2,在(2)的条件下,D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/163a88553a193e3e31f42a42def91c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3d566704b44ea4ef1f99c37bd46902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
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2023-08-12更新
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2卷引用:2023年湖南省长沙市宁乡市中考模拟数学试题
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10 . 如图,在平面直角坐标系中,O为坐标原点,抛物线
与x轴交于点A、B两点(点A在点B的左侧),与y轴交于点C,且
.
(1)求抛物线的解析式;
(2)如图①,若点P为第一象限的抛物线上一点,直线
交x轴于点D,且
平分
,求点P的坐标;
(3)如图②,点Q为第四象限的抛物线上一点,直线BQ交y轴于点M,过点B作直线
,交y轴于点N,当Q点运动时,线段MN的长度是否会变化?若不变,请求出其长度;若变化,请求出其长度的变化范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526bb5b206810f46a51d960f58510779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a7b5182b56259506c4418fdf1ef65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/19/95c5e28f-91e6-4936-a63e-41de9f34c925.png?resizew=406)
(1)求抛物线的解析式;
(2)如图①,若点P为第一象限的抛物线上一点,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0b2fb47382e76af829559a75b48fca.png)
(3)如图②,点Q为第四象限的抛物线上一点,直线BQ交y轴于点M,过点B作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f2c7c3c2d3accbe5883967a8966565.png)
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