1 . 如图,有长为24米的篱笆,一面利用墙(墙的最大可用长度为9米)围成中间隔有一道篱笆的长方形花圃.设花圃
边为x米,面积为y平方米.
(1)写出y与x的函数关系式______,并写出x的取值范围______;
(2)如果要围成面积为
的花圃,求
的长度;
(3)如果要使围成的花圃面积最大,求最大面积是多少
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/05eeef19-b5dd-405a-aa73-76b4fd6fb970.png?resizew=235)
(1)写出y与x的函数关系式______,并写出x的取值范围______;
(2)如果要围成面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbda3e2ba3d2e13f2a3e2e9af025aad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)如果要使围成的花圃面积最大,求最大面积是多少
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba007666deb89951641bd1e24bc174a2.png)
您最近一年使用:0次
2 . 如图,用一段长为
米的篱笆围成一个一边靠墙的矩形苗圃园,已知墙长为
米,设这个苗圃园垂直于墙的一边长为
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/bc7b2ed7-e121-46a7-b214-69eed1ad8471.png?resizew=199)
(1)若苗圃园的面积为
平方米,求
的值.
(2)若平行于墙的一边长不小于
米,当
取何值时,这个苗圃园的面积有最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/bc7b2ed7-e121-46a7-b214-69eed1ad8471.png?resizew=199)
(1)若苗圃园的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6620729a37129c16cfd61cd59500bfe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若平行于墙的一边长不小于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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3 . 在菱形
中,对角线
,
的和是
,则这个菱形的面积的最大值是______ cm2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f398c9ec30f5dd398b6641201fc521a6.png)
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4 . 如图,矩形窗户边框
由矩形
,矩形
,矩形
组成,且
.已知制作一个窗户边框的材料的总长是6米,设
(米),窗户边框
的面积为S(
).
(1)①用x的代数式表示
;
②求x的取值范围.
(2)求当x取何值时,S达到最大,并求出最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8057131f4bae6260aaeda1eb3c77fb7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e877ca1e82f435fed02d61d5bab184d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e179ae57c5f1b5ba219d78f7433ff97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c91bb20a2a0d3b59f23cf5f0d645aca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e56e25b06e8512793b95b76d0d966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f793fcfa981e4e3c34c9ccb7f1861a8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/946c16f7-3bf2-4c4d-8f60-2fc346b84fe3.png?resizew=91)
(1)①用x的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
②求x的取值范围.
(2)求当x取何值时,S达到最大,并求出最大值.
您最近一年使用:0次
2023-11-19更新
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81次组卷
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2卷引用:浙江省杭州市下城区杭州观成实验学校2023-2024学年九年级上学期期中数学试题
5 . 在2024年元旦即将到来之际,学校准备开展“冬日情暖,喜迎元旦”活动,小星同学对会场进行装饰.如图1所示,他在会场的两墙
、
之间悬挂一条近似抛物线
的彩带,如图2所示,已知墙
与
等高,且
、
之间的水平距离
为8米.
,
的高度是 米,抛物线的顶点坐标为 ;
(2)为了使彩带的造型美观,小星把彩带从点
处用一根细线吊在天花板上,如图3所示,使得点
到墙
距离为3米,使抛物线
的最低点距墙
的距离为2米,离地面2米,求点
到地面的距离;
(3)为了尽量避免人的头部接触到彩带,小星现将
到地面的距离提升为3米,通过适当调整
的位置,使抛物线
对应的二次函数的二次项系数始终为
,若设点
距墙
的距离为
米,抛物线
的最低点到地面的距离为
米,探究
与
的关系式,当
时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372ad1814216fb7ebe39a0e067cf70be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)为了使彩带的造型美观,小星把彩带从点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)为了尽量避免人的头部接触到彩带,小星现将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef06a3c4befc30945469d55bea138bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2023-11-18更新
|
435次组卷
|
6卷引用:贵州省遵义市红花岗区四校联考2023-2024学年九年级上学期期中数学试题
6 . 如图,要围一个矩形菜园ABCD,其中一边AD是墙,且AD的长不能超过26m,其余的三边AB,BC,CD用篱笆,且这三边的和为40m.有下列结论:①AB的长可以为9m;②AB的长有两个不同的值满足菜园ABCD面积为
;③菜园ABCD面积的最大值为
.其中,正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5780825e3c82ba1682315d4d397f59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d30414777b108d2fb1cdabd09c265a30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/3f9f9967-4f0d-48ba-a0fe-50bcfc1cea7c.png?resizew=196)
您最近一年使用:0次
7 . 用一段20米长的铁丝在平地上围成一个矩形,该矩形的一边长为x米,面积为y平方米,则y关于x的函数关系式为( )
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
8 . 如图是一块篱笆围成的矩形土地
,并且由一条与
边平行的篱笆
分开,已知篱笆的总长为90米(厚度不计).设
米,
米.
(1)用含有
的代数式表示
.
(2)设矩形土地
面积为
平方米,当
时,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457c6935fc4305838a02325c4e08017a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/9569009d-9ef6-4b18-8613-dcdef2a4e6cf.png?resizew=167)
(1)用含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)设矩形土地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e260e4f9c0d14808bc644cc83c60292c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
您最近一年使用:0次
2023-11-15更新
|
128次组卷
|
4卷引用:浙江省杭州市余杭区2023-2024学年九年级上学期期中数学试题
9 . 如图,某中学综合与实践小组要围成一个矩形菜园
,其中一边
靠墙,其余的三边
,
,
用总长为40米的栅栏围成.设矩形
的边
米,面积为S平方米.
(1)活动区面积S与
之间的关系式为____________ ;
(2)菜园
最大面积是____________ 平方米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/5/be090db5-4a34-4cf6-a600-6d244b2e8c6b.png?resizew=208)
(1)活动区面积S与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)菜园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2023-11-15更新
|
143次组卷
|
2卷引用:北京市房山区2023-2024学年九年级上学期期中数学试题
10 . 如图,在足够大的空地上有一段长为40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100米木栏.设矩形
中,边
为
米,面积为
平方米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/1bb6fb76-411a-4748-a264-49078efca681.png?resizew=226)
(1)求
与
之间的函数关系式,并写出自变量
的取值范围;
(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://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/1bb6fb76-411a-4748-a264-49078efca681.png?resizew=226)
(1)求
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求矩形菜园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
2023-11-15更新
|
91次组卷
|
2卷引用:安徽省皖北片区2023-2024学年九年级上学期期中数学试题