1 . 如图,一块周长为的矩形铁皮,如果在该铁皮的四个角上截去四个边长为
的小正方形,然后把四边折起来,做成一个无盖的长方体铁盒.
(1)要使铁盒的容积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca871adec8475ffa021525d1f9c780d.png)
(2)要使铁盒的容积最大,矩形铁皮的长和宽应为多少?最大容积是多少?
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2 . 如图,空地上有一堵墙,某人利用墙和木栏围成一个矩形菜园
.已知矩形菜园的一边靠墙,另三边一共用了100米木栏.设矩形的宽为x,写出矩形菜园
的面积
与x(m)之间的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8971606eb643d7f5993555f6d1e96c0a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/4e5bbd2c-ddc5-41e9-b1ca-62b6d59dadf9.png?resizew=197)
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3 . 如图,已知抛物线
对称轴为
,过其顶点
的一条直线
与该抛物线的另一个交点为
.要在坐标轴上找一点
,使得
的周长最小,则点
的坐标为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4fac8a0cd2238213b422f5d6be1606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba53065eb180a682305fddb95d14b62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5229781ae74407f4a432c10aae26de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/03ca96b1-1788-4af2-af9f-3f387b1346a1.png?resizew=143)
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4 . 如图,用18米长的木方条做一个有一条横档的矩形窗子,窗子的宽
不能超过2米. 为使透进的光线最多,求:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/20739891-66ca-4d02-9937-23b683cd3617.png?resizew=86)
(1)则窗子的长多少米?
(2)并求出最大透光面积.(横柱遮光忽略)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/20739891-66ca-4d02-9937-23b683cd3617.png?resizew=86)
(1)则窗子的长多少米?
(2)并求出最大透光面积.(横柱遮光忽略)
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5 . 如图,利用
的墙角修建一个梯形ABCD的储料场,其中
,并使
,新建墙
上预留一长为2米的门
.如果新建墙
总长为16米,设
的长为
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/10b66c5b-cd08-4e25-b886-6855f7960741.png?resizew=144)
(1)边
的长(x的代数式表示);
(2)当储料场的面积为48平方米时,求边
的长;
(3)怎样修建才能使储料场的面积最大?最大面积多少平方米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cde7aace5b888a1a1c26fb911e2f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968f24afbb88877f944f749c8339a819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89eb1a7fdf7abca067558c9f41b67f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/10b66c5b-cd08-4e25-b886-6855f7960741.png?resizew=144)
(1)边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)当储料场的面积为48平方米时,求边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(3)怎样修建才能使储料场的面积最大?最大面积多少平方米?
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2023九年级上·江苏·专题练习
6 . 如图,已知正方形
的边长为4,E是
边上的一个动点,
,
交
于F,连接
,则
的最小值是 _____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/78b5da77-c2f1-4796-ab19-a65272ed85a2.png?resizew=107)
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7 . 为响应扬州市“创建全国文明城市”号召,某单位不断美化环境,拟在一块矩形空地上修建绿色植物园,其中一边用墙,可利用的墙长不超过
,另外三边由
长的栅栏围成,设矩形
空地中,垂直于墙的边
,面积为
(如图).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/c8c2c0e2-32f1-4a11-b03d-9ce021110918.png?resizew=112)
(1)求
与
之间的函数关系式,并写出自变量
的取值范围;
(2)当
为何值时,
有最大值?最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1e0bd4fe8afb14b572852121cef83d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f03c367201c385fcf9bdbf09d22b9e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ac400e3f5ba8b945bbef83db8611b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/c8c2c0e2-32f1-4a11-b03d-9ce021110918.png?resizew=112)
(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)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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8 . 在边长为
的正方形
上,剪去四个全等的等腰直角三角形,再沿图中的虚线折起,折成一个长方体形状的包装盒(
四个顶点正好重合于上底面的一点);已知
在
上,是被剪去的一个等腰直角三角形斜边的两个端点,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/94d1de11-4d2a-4042-b598-5cbb5081be74.png?resizew=142)
(1)若折成的包装盒恰好是个正方体,试求这个包装盒的体积
;
(2)某广告商要求包装盒表面(不含下底面)面积最大,试问
应取何值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb6ba6a20d59ed6800fdd0e2ca5727c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4496fe22b40bc63581998e6b7ef6783.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c09a8d66a84737fe9935f7513e2c165.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/94d1de11-4d2a-4042-b598-5cbb5081be74.png?resizew=142)
(1)若折成的包装盒恰好是个正方体,试求这个包装盒的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
(2)某广告商要求包装盒表面(不含下底面)面积最大,试问
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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9 . 如图,四边形
中的两条对角线
,
互相垂直,
,当
长为______ 时,四边形
的面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.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/7712aaf7c0fa135847df6e3a1d547b27.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/2023/12/6/889efe5d-6081-4e5a-9e46-d2002738fbc1.png?resizew=139)
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2024-01-02更新
|
139次组卷
|
3卷引用:江苏省扬州市邗江区梅苑双语学校2023-2024学年九年级上学期12月月考数学试题
10 . 如图所示,在一矩形空地
内建筑一个小的矩形花坛
,要求
在
上,
,
分别在
,
上,已知
米,
米,设
(米)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/e1b480f1-7acd-4843-989b-bad892f4859f.png?resizew=160)
(1)设
,求
与
之间的函数表达式;
(2)当
,
的长度分别是多少时,花坛
的面积最大?并求出最大面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdc2c9270659232c27a11a75feae638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a36acbc77a4a3d1abb9b664108aed80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985d220dab659dc780a5b652f7d2676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ed39deec38230fe7bcc645722626d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/e1b480f1-7acd-4843-989b-bad892f4859f.png?resizew=160)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec629ef9ca40bd5e964e30b3d2f3e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4cb4069a2e1e90d1a9c4979ad09ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdc2c9270659232c27a11a75feae638.png)
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