1 . 如图,用一段长为
的篱笆围成一个一边靠墙的矩形花圃
,墙长
.设
长为
,矩形的面积为
.问:当
长为多少米时,所围成的花圃
面积最大?最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c08094f72d5bd69246c453dd28e33d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30232fe2f47092bdafd0b8d9f43fb6a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c2b70e3270ca69a01d442ec0840ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc99bfe039bd21c6729def8b1443b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2023/1/5/3146429529587712/3161217502052352/STEM/839db21040054e879ba9140d0eb866e2.png?resizew=189)
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2 . 学校准备建一个矩形花圃,其中一边靠墙,另外三边用周长为30米的篱笆围成.已知墙长为18米,设花圃垂直于墙的一边长为x米,花圃的面积为y平方米.
(1)当
时,求出x的值;
(2)当x为何值时,y有最大值?最大值是多少?
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40655ecb7cf7afa90553d822d5beecdd.png)
(2)当x为何值时,y有最大值?最大值是多少?
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3 . 抛物线
与x轴交于A、B两点(A在B的左侧),与y轴交于点
,已知
,点P在抛物线上,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/26/a056de32-374b-4089-bf9f-0bc9ecc86d6f.png?resizew=298)
(1)求抛物线的解析式;
(2)如图1,若点P在第四象限,点D在线段
上,连接
并延长交x轴于点E,连接
,记
的面积为
,
的面积为
,当
时,求点P的坐标;
(3)如图2,若点P在第二象限,点F为抛物线的顶点,抛物线的对称轴l与线
交于点G,当
时,求点P的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ec7f84f716a316ec92d133927666c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dfa8a00d2c57cb997d3b7da8f5d5fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5587373b8f90ada5327d2a156bf7b807.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/26/a056de32-374b-4089-bf9f-0bc9ecc86d6f.png?resizew=298)
(1)求抛物线的解析式;
(2)如图1,若点P在第四象限,点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b17b75d6a83edb110f3dd91a5f40681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31dd78e9156dcf6db93f6cbcc5b43b14.png)
(3)如图2,若点P在第二象限,点F为抛物线的顶点,抛物线的对称轴l与线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2666f3004500f4bae42eaef45e65ce8.png)
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4 . 如图,有长为
的篱笆,一面利用墙(墙的最大可用长度为
)围成中间隔有一道篱笆的长方形养鸡场
,设养鸡场的宽
为
,长为
,面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/4baaf11d-5ec7-4dea-83d2-a23e192c7c3e.png?resizew=200)
(1)求y与x的函数关系,并写出x的取值范围;
(2)当长方形的长、宽各为多少时,养鸡场的面积最大,最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d4166fee97516ad1b1d4759a8e4ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167e6e41ac221847824a72e964f340f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c2b70e3270ca69a01d442ec0840ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc99bfe039bd21c6729def8b1443b04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/4baaf11d-5ec7-4dea-83d2-a23e192c7c3e.png?resizew=200)
(1)求y与x的函数关系,并写出x的取值范围;
(2)当长方形的长、宽各为多少时,养鸡场的面积最大,最大面积是多少?
您最近一年使用:0次
2023-01-23更新
|
176次组卷
|
2卷引用:山东省济南市南山区2022-2023学年九年级上学期期末考试数学试题
5 . 根据以下素材,探索完成任务
如何设计纸盒 | ||
素材1 | 利用一边长为40cm的正方形纸板可能设计成如图1和图2所示的两种纸盒,图1是无盖的纸盒,图2是一个有盖的纸盒. | ![]() |
素材2 | 如图,若在正方形硬纸板的四角各剪掉一个同样大小的小正方形,将剩余部分折成一个无盖的长方体盒子。 | ![]() |
问题解决 | ||
任务1 | 初步探究:折一个底面积为![]() | 求剪掉的小正方形的边长为多少? |
任务2 | 探究折成的无盖长方体盒子的侧面积是否有最大值? | 如果有,求出这个最大值和此时剪掉的小正方形的边长;如果没有,说明理由 |
您最近一年使用:0次
6 . 如图,已知抛物线
经过
、
两点,其对称轴与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/333d61ee-545c-4da8-a8fb-0c4b881039fe.png?resizew=155)
(1)求该抛物线和直线
的解析式;
(2)设抛物线与直线
相交于点
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22106baba401cfaef881253e49c3c777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8bc6536fe5e48a5d3ba5b042aa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/333d61ee-545c-4da8-a8fb-0c4b881039fe.png?resizew=155)
(1)求该抛物线和直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)设抛物线与直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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2023-01-18更新
|
204次组卷
|
2卷引用: 广东省广州市中国教育科学研究院荔湾实验学校2022~2023学年九年级数学上学期10月月考试卷
7 . 用长为6米的铝合金型材做一个形状如图所示的矩形窗框,设矩形窗框的宽为
米,窗框的透光面积为
平方米.(铝合金型材宽度不计)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/24/1b205d5f-45a1-4a56-ac6e-2869626b37f7.png?resizew=116)
(1)求
与
的函数关系式,并写出
的取值范围.
(2)直接写出
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/24/1b205d5f-45a1-4a56-ac6e-2869626b37f7.png?resizew=116)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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名校
8 . 如图,在正方形
中,
,延长
至
,使
.以
、
为邻边作
.动点
从点
出发,以每秒2个单位的速度沿
向终点
运动,过点
作
交
或
的延长线于点
,以
为边向右作正方形
.设正方形
与
的重叠部分的面积为
,点
运动的时间为
(
,单位:秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/65c936e8-d62a-40b9-8cf7-901a8eed5516.png?resizew=314)
(1)用含
的代数式表示线段
为______;
(2)当点
与点
重合时,求
的值;
(3)当正方形
与
的重叠部分不是正方形时,用含
的代数式表示
;
(4)当
或
是锐角三角形时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3699139ef137f5053d121cd22a653ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbd75f5e846f0c89bcde1ff44a03a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6f359362fa8af71be3517336ff5863.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbd75f5e846f0c89bcde1ff44a03a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/65c936e8-d62a-40b9-8cf7-901a8eed5516.png?resizew=314)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134c3d2c318a33a82da4134dd17fa57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbd75f5e846f0c89bcde1ff44a03a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b343ad6d49577cc2453693255fd30268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc880c3faa907c3b952f7c948906842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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名校
9 . 某农场拟建两间矩形饲养室,一面靠现有墙(墙足够长),中间用一道墙隔开,并在如图所示的两处各留
宽的门.已知计划中的材料可建墙体(不包括门)总长为
,则当能建成的饲养室总占地面积最大时,中间隔开的墙长是( )米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/2b42eac9-a693-459c-baad-7e680c510988.png?resizew=167)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b249c222293a0df29234b4e983ceb11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea591f7a39ea1f58f56bf3cb9b0b3b40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/23/2b42eac9-a693-459c-baad-7e680c510988.png?resizew=167)
A.4 | B.5 | C.6 | D.8 |
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2023-01-17更新
|
725次组卷
|
7卷引用:辽宁省沈阳市和平区2022-2023学年九年级上学期期末数学试题
辽宁省沈阳市和平区2022-2023学年九年级上学期期末数学试题(已下线)第10讲 实际问题与二次函数-【暑假自学课】2023年新九年级数学暑假精品课(人教版)(已下线)第08讲 二次函数的应用-【暑假自学课】2023年新九年级数学暑假精品课(浙教版)辽宁省沈阳市和平区第一三四中学2022-2023学年九年级上学期期末数学试题辽宁省沈阳市和平区第一二六中学2022-2023学年九年级上学期期末数学试题(已下线)2023年天津市中考数学真题变式题11-15题(已下线)期末复习(易错45题21个考点)-2023-2024学年九年级数学上学期期中期末考点归纳满分攻略讲练(浙教版)
10 . 如图,某校准备用54米的围栏修建一边靠墙的矩形花园
,已知墙体的最大可用长度为28米,设
的长为x米,矩形花园的面积为y平方米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/f633e6e0-748b-4d70-a434-8c3ecb67999d.png?resizew=165)
(1)请用含有x的代数式表示y,并写出自变量x的取值范围;
(2)如果该矩形花园的面积为360平方米,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4e374025e1e0faae1433858e092058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/20/f633e6e0-748b-4d70-a434-8c3ecb67999d.png?resizew=165)
(1)请用含有x的代数式表示y,并写出自变量x的取值范围;
(2)如果该矩形花园的面积为360平方米,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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