1 . 如图,一块长为的矩形草地
由篱笆围着,并且中间由两条与短边平行的篱笆分开,篱笆总长为
.
(1)求矩形草地的面积S.(用含x的代数式表示,结果需化简)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0aa861d33155111dd21df6ce57d43d0.png)
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2 . 已知正方形
的边长为10,现改变该正方形的边长,使其变为矩形.若
的长增加了
的长减少了
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/9e96ac8a-0c3f-447c-9896-29fdad9c3389.png?resizew=97)
(1)若
,且改变后的矩形面积为75,求x的值;
(2)求改变后得到的矩形面积的最大值(请用常数或含k的代数式表示).
![](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/ef98b48ddd4fbd147ab38f997871cc37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae20135cb14afaeb7f3453b3881db163.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/9e96ac8a-0c3f-447c-9896-29fdad9c3389.png?resizew=97)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f71ddf743c9feebd7e838d921e95562c.png)
(2)求改变后得到的矩形面积的最大值(请用常数或含k的代数式表示).
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3 . 如图①,已知:在矩形
的边
上有一点O,
,以O为圆心,
长为半径作圆,交
于M,恰好与
相切于H,过H作弦
,弦
.若点E是
边上一动点(点E与C,D不重合),过E作直线
交
于F,再把
沿着动直线
对折,点C的对应点为G.设
,
与矩形
重叠部分的面积为S.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/54a90b33-5302-4659-ab5c-3dbf84d41764.png?resizew=333)
(1)求
,
的长;
(2)
的直角顶点G能落在
上吗?若能,求出此时x的值;若不能,请说明理由;
(3)求S与x之间的函数关系式,并直接写出
与
相切时,S的值.
![](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/11f16e77b039842ae40a4b04c527655a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba465d7b8812488bd478c35ab028c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ba0b621a8731c153645f47c73eaa94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c851c07c6e4b9a66e76168d6b16592e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1dd8809233c90f66563c34f2164415.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/54a90b33-5302-4659-ab5c-3dbf84d41764.png?resizew=333)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)求S与x之间的函数关系式,并直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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4 . 张阿姨要围成一个矩形菜园.菜园的一边是18米长的墙,另外三边用总长为32米的篱笆恰好围成.围成的菜园是如图所示的矩形
.设
边的长为
米,矩形
的面积为S平方米.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/e924b3fb-a8ee-47e7-96c2-5a1279cc3908.png?resizew=252)
(1)求S与
之间的函数关系式;
(2)若所围成菜园的面积是110平方米,则利用了多少米的墙?
(3)所围成菜园的最大面积是多少?
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/e924b3fb-a8ee-47e7-96c2-5a1279cc3908.png?resizew=252)
(1)求S与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若所围成菜园的面积是110平方米,则利用了多少米的墙?
(3)所围成菜园的最大面积是多少?
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名校
5 . 如图,有长为
的篱笆,一面利用墙(墙的最大可用长度a为
),围成中间隔有一道篱笆的矩形花圃,设花圃的宽为
,面积为
.
(1)求S与x的函数关系式,并写出x的取值范围;
(2)当
时,求x的值;
(3)求矩形花圃的最大面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5c75c647dce7e2cf37da82fe9f6610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/652d9ac21e0f4af80df32e8c0d6b7e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ac400e3f5ba8b945bbef83db8611b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ec46ba5eab5c6e3f9a7788eda30a57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/7ea8fccc-9c97-4df4-bfcd-3e2ed6f63b80.png?resizew=149)
(1)求S与x的函数关系式,并写出x的取值范围;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6da095ccc82d53052030ebdce1538c6e.png)
(3)求矩形花圃的最大面积.
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2024-03-12更新
|
71次组卷
|
2卷引用:福建省厦门外国语学校2023-2024学年九年级上学期月考数学试题
6 . 有一块形状如图的四边形余料
,
,测得
,
.要在这块余料中截取一块矩形材料,其中一边在
上,并使截得的面积尽可能大.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/f86cb62e-6e40-488f-83fd-b17ff5ec1bc0.png?resizew=113)
(1)若所截矩形材料的一个顶点恰好为D,求该矩形材料的面积.
(2)能否截出比(1)中面积更大的矩形材料?如果能,求出这些矩形材料面积的最大值;如果不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0a059f33f1a5cfd0c2d270b755b9d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998329f9cdb86f5d60d7d5d70fc3781e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/9/f86cb62e-6e40-488f-83fd-b17ff5ec1bc0.png?resizew=113)
(1)若所截矩形材料的一个顶点恰好为D,求该矩形材料的面积.
(2)能否截出比(1)中面积更大的矩形材料?如果能,求出这些矩形材料面积的最大值;如果不能,请说明理由.
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7 . 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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8 . 如图,利用一面墙(墙
最长可利用24米),围成一个矩形苗圃园
,与围墙平行的一边
上要预留3米宽的入口(如图
所示,不用砌墙),用45米长的墙的材料做围墙,设这个苗圃园垂直于墙的一边的长为x米.
(2)垂直于墙的一边的长为多少米时,这个苗圃园的面积最大,并求出这个最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](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/411461db15ee8086332c531e086c40c7.png)
(2)垂直于墙的一边的长为多少米时,这个苗圃园的面积最大,并求出这个最大值.
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9 . 在平面直角坐标系中,我们把直线
称为抛物线
的生成线,抛物线与它生成线的交点称为抛物线的生成点,例如:抛物线
的生成线是直线
,生成点是
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/a51da4c2-797e-4ad6-afb8-8ff601e238ef.png?resizew=122)
(1)若抛物线
的生成线是直线
,求m与n的值.
(2)已知抛物线
如图所示,若它的一个生成点是
.
①求m的值.
②若抛物线
是由抛物线
平移所得(不重合),且同时满足以下两个条件:
一是这两个抛物线具有相同的生成线;
二是若抛物线
的生成点为点A,B,抛物线
的生成点为点C,D,则
,求p与q的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac52246d5bb85d3cc532a9a04655916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5894f0258b4b0acb81412de25a8478de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026808536f6b6d265c778e23836fbf13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f24aa7454f183d1e7bbdace32cc3086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f245be6e1c9e405b22f17ba8fe58a03e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/a51da4c2-797e-4ad6-afb8-8ff601e238ef.png?resizew=122)
(1)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3606dc69dc8d5fc9542397c88bab090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b84f2ae3eb58552df301eefc246036.png)
(2)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce5790f69841bc047d5f4f3e6055595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9594437dde06d365a610f3b5f9419133.png)
①求m的值.
②若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2630d6cf14b3e8c82ee7080799901b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce5790f69841bc047d5f4f3e6055595.png)
一是这两个抛物线具有相同的生成线;
二是若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce5790f69841bc047d5f4f3e6055595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2630d6cf14b3e8c82ee7080799901b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
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10 . 如图,在锐角三角形
中,边
,高
,矩形
的顶点E、H分别在
、
上,F、G在
上,
与
交于点N.
(1)试说明:
;
(2)若矩形
是正方形,求
的长;
(3)当
为何值时,矩形
的面积最大?最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ac44e71fbdcb9d84dca887dfb4f28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ea14e8b5d80ab467065d7a87a5d42a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481c3c38cf999b4dacada15ea517b8b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/6909422c-1262-42af-89b5-0e3c1a8038c3.png?resizew=158)
(1)试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10e1f99c673b2322894d49c8826aa74.png)
(2)若矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481c3c38cf999b4dacada15ea517b8b.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5481c3c38cf999b4dacada15ea517b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89029e1d782dbf6a0bda8605a7c5ad4.png)
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