1 . 卡塔尔世界杯期间,主办方向中国某企业订购1万幅边长为4米的正方形作品
,其设计图案如图所示(四周阴影是四个全等的矩形,用材料甲;中心区是正方形
,用材料乙).在厚度保持相同的情况下,两种材料的消耗成本如下表
设矩形的较短边
的长为x米,制作一幅作品的材料费用为y元.
(1)
的长为______米(用含x的代数式表示);
(2)求y关于x的函数解析式,并写出自变量x的取值范围;
(3)当中心区的边长不小于3时,预备材料的购买资金700万够用吗?通过运算,请写出你的理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae2fd0bb6dcb90ee752e7bcabd22b8e.png)
材料 | 甲 | 乙 |
价格(元/![]() | 60 | 30 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd61a751e4a47463b69923c771d085c4.png)
(2)求y关于x的函数解析式,并写出自变量x的取值范围;
(3)当中心区的边长不小于3时,预备材料的购买资金700万够用吗?通过运算,请写出你的理由.
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2023-02-21更新
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3卷引用:浙江省绍兴市越城区2022-2023学年九年级上学期期末试卷数学试题(B卷)
浙江省绍兴市越城区2022-2023学年九年级上学期期末试卷数学试题(B卷)(已下线)专题02 二次函数的应用五大题型-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(浙教版)湖北省武汉二中广雅中学2023-2024学年九年级下学期月考数学试题
2 . 已知,如图,抛物线
经过直线
与坐标轴的两个交点
,
,此抛物线与
轴的另一个交点为
,抛物线的顶点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/71ecf256-c544-461b-add5-633adf0eb717.png?resizew=243)
(1)求此抛物线的解析式;
(2)设点
是线段
上的动点,作
轴交抛物线于点
,求线段
长度的最大值;
(3)在
轴上是否存在点
使
为直角三角形?若存在,确定点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/71ecf256-c544-461b-add5-633adf0eb717.png?resizew=243)
(1)求此抛物线的解析式;
(2)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d1668b8e80d00f85e5836f6ae9dd36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eda61683bb1d4d62441f0625097b477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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3卷引用:山东省东营市东营区2022-2023学年九年级上学期期末数学试题
3 . 果农小张准备投资观光采摘水果项目:在如图的正方形果园(阴影部分)中种植水果,在正方形果园四周建造宽2.5m的观光道路.建造道路的成本为80元/m2,第一季水果销售,预计平均每平方米获得毛利润20元.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/bd64b7d0-e76f-4d73-a12f-4fbd736ace0e.png?resizew=162)
(1)当果园边长为
米时,设第一季水果销售的毛利润减去道路建造成本后的利润为
元,求
与
之间的函数解析式.
(2)当
为何值时,
的值最小?
(3)要使得
,求
的最小值(精确到
,
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/27/bd64b7d0-e76f-4d73-a12f-4fbd736ace0e.png?resizew=162)
(1)当果园边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(3)要使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc65d6eb9b63f96d80b54ec9893aee8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fda92b737fbe94986b1e2fc67ee22373.png)
您最近一年使用:0次
4 . 一块三角形材料如图所示,
,
,
.用这块材料剪出一个矩形
,其中,点D,E,F分别在
,
,
上,要使剪出的矩形
的面积最大,点E应选在何处?矩形
的最大面积是多少?说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/38381064-3390-4a0b-a148-efb2664cd1ad.png?resizew=84)
(1)根据题意完成下面填空:若设
,则
;
;
(2)请你继续完成对本题的解答.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/38381064-3390-4a0b-a148-efb2664cd1ad.png?resizew=84)
(1)根据题意完成下面填空:若设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0124d4c22e17a6b719cf2d0f0b305e4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
(2)请你继续完成对本题的解答.
您最近一年使用:0次
2023-02-20更新
|
334次组卷
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3卷引用:天津市河西区2022-2023学九年级上学期期末数学试卷
天津市河西区2022-2023学九年级上学期期末数学试卷 天津市河西区2022-2023学年九年级下学期数学开学试题(已下线)清单12 二次函数与实际问题(10种题型解读+提升训练)-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)
5 . 如图,在平面直角坐标系中,直线
分别交
轴、
轴于A、B两点.抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
经过A、B两点,且与
轴的另一个交点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/a753ec48-96be-4998-a25d-31648a730b28.png?resizew=161)
(1)求该抛物线的解析式;
(2)点
为直线
上一点,点
为该抛物线上一点,且
、
两点的纵坐标都为
.点
为
轴上的点,若四边形
是平行四边形,请直接写出点
的坐标;
(3)若点
是线段
上的一个动点,过点
作
轴的垂线,交该抛物线于点
,连结
、
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c608def11fa0e2b34f05592ef1d11fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f2b5ee1eabb64358a3d9db2349b6fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37df9dad3961893b22d6639c4311e267.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/a753ec48-96be-4998-a25d-31648a730b28.png?resizew=161)
(1)求该抛物线的解析式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
您最近一年使用:0次
6 . 如图,有长为
的篱笆,现一面利用墙(墙的最大可用长度为
),设矩形花圃的宽
为
,面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/1f9b0eba-8b2d-41c7-b46e-5bb56cf3dd11.png?resizew=169)
(1)求
与
的函数关系式及
的取值范围;
(2)当花圃的面积为
时,求
的长;
(3)当
的长是多少米时,围成的花圃的面积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74dee2e8849924124cbb31f9c6f15479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167e6e41ac221847824a72e964f340f1.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/78059694216ed02937519967943ac6c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/1f9b0eba-8b2d-41c7-b46e-5bb56cf3dd11.png?resizew=169)
(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)当花圃的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be01f09ad699eecfefd97473b95aa559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2023-02-18更新
|
284次组卷
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5卷引用:福建省莆田市仙游县2022-2023学年九年级上学期期末质量检测数学试卷
福建省莆田市仙游县2022-2023学年九年级上学期期末质量检测数学试卷(已下线)专题08 二次函数应用(六大类型)(题型专练)-2023-2024学年九年级数学上册《知识解读·题型专练》(人教版)(已下线)专题08 二次函数应用(六大类型)(题型专练)-2023-2024学年九年级数学上册《知识解读·题型专练》(浙教版)(已下线)专题08 二次函数应用(六大类型)(题型专练)-2023-2024学年九年级数学下册《知识解读·题型专练》(北师大版)(已下线)专题08 二次函数应用(六大类型)(题型专练)-2023-2024学年九年级数学下册《知识解读·题型专练》(苏科版)
7 . 如图,用长度均为
的两根绳子分别围成矩形
和扇形
,设
的长为
,半径
为
,矩形和扇形的面积分别为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/221180cc-3ca0-4a7e-8e82-4616eca3e91e.png?resizew=405)
(1)
的长为______
,
的长为______
;(用含x或R的代数式表示)
(2)求
,
的最大值,并比较大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e978c77cb0d7eff794447241e9829867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a0f9bc9123d19a09babe8609cf12327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd807e70133968fbbf206b8ff23893a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bbc093c93cf9ad50376a85093616384.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5481ba688a173f699f9fd20a58221e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/221180cc-3ca0-4a7e-8e82-4616eca3e91e.png?resizew=405)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e124a392dc84fcc1662fe6d896aa12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
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2023-02-18更新
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279次组卷
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4卷引用:江苏省南京市联合体2022-2023学年九年级上学期期末数学试题
江苏省南京市联合体2022-2023学年九年级上学期期末数学试题江苏省南京市六合区2022-2023学年九年级上学期期末数学试题(已下线)第12讲 弧长及扇形的面积(2种题型)-【暑假自学课】2023年新九年级数学暑假精品课(苏科版)江苏省盐城市2023-2024学年九年级上学期期末数学试题
8 . “关联”是解决数学问题的重要思维方式.角平分线的有关联想就有很多……
(1)如图①,
是
的角平分线,求证
.
请根据小明或小红的思路,选择一种并完成证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/9cb9ce9c-f688-4cd8-b804-b311d38ca7c3.png?resizew=142)
【作图应用】
(2)如图②,
是
的弦,在
上作出点P,使得
.
要求:(1)用直尺和圆规作图;(2)保留作图的痕迹,写出必要的文字说明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/1ac43dff-df89-40d5-9439-6406ea646c85.png?resizew=126)
【深度思考】
(3)如图③,
是
的角平分线,若
,则
的面积最大值是______.
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ede962f59496038e45f8f614071adb3.png)
小明思路:关联“平行线、等腰三角形”,利用“三角形相似”. 小红思路:关联“角平分线上的点到角的两边的距离相等”,利用“等面积法”. |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/9cb9ce9c-f688-4cd8-b804-b311d38ca7c3.png?resizew=142)
【作图应用】
(2)如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8902a0d64b7b8e6a8e55eb037b88c300.png)
要求:(1)用直尺和圆规作图;(2)保留作图的痕迹,写出必要的文字说明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/1ac43dff-df89-40d5-9439-6406ea646c85.png?resizew=126)
【深度思考】
(3)如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0bd7b6e1c2ebd1b944ae16f053ddd6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/49d09f82-7901-4b6f-bfb7-1a770cadefa4.png?resizew=162)
您最近一年使用:0次
2023-02-18更新
|
670次组卷
|
5卷引用:江苏省南京市联合体2022-2023学年九年级上学期期末数学试题
江苏省南京市联合体2022-2023学年九年级上学期期末数学试题江苏省南京市六合区2022-2023学年九年级上学期期末数学试题2023年江苏省宿迁市中考一模数学试题江苏省盐城市2023-2024学年九年级上学期期末数学试题(已下线)专题09圆的有关位置关系及计算1(十大类型)-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(苏科版)
9 . 如图,某农场要建一个矩形的菜园,菜园的一边
靠墙(墙长5m),另外三边
,
,
用木栏围成,木栏长8m.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/7d101fec-c6e0-443a-bbe1-0f0d6309fca6.png?resizew=113)
(1)求菜园的面积能达到
时的长和宽;
(2)菜园的最大面积是多少?
![](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://img.xkw.com/dksih/QBM/editorImg/2023/2/17/7d101fec-c6e0-443a-bbe1-0f0d6309fca6.png?resizew=113)
(1)求菜园的面积能达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1cbadc94d4650c757e2db089879c9f1.png)
(2)菜园的最大面积是多少?
您最近一年使用:0次
10 . 在2020年新冠肺炎疫情期间,某中学响应政府有“停课不停学”的号召充分利用网络资源进行网上学习,九年级1班的全体同学在自主完成学习任务的同时,彼此关怀,全班每两个同学都通过一次电话,互相勉励,共同提高,如果该班共有48名同学,若每两名同学之间仅通过一次电话,那么全班同学共通过多少次电话呢?我们可以用下面的方式来解决问题.
用点
、
、
…
分表示第1名同学、第2名同学、第3名同学…第50名同学,把该班级人数x与通电话次数y之间的关系用如图模型表示:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/763f525c-c22a-4e85-bbb7-d4ddc7c08d00.png?resizew=657)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
______
______
(1)填写上图中第四个图中y的值为______,第五个图中y的值为______.
(2)通过探索发现,通电话次数y与该班级人数x之间的关系式为______,当
时,对应的
______.
(3)若九年级1班全体女生相互之间共通话276次,问:该班共有多少名女生?
用点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53451f8c76987d8c53f045cd68411a77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/26/763f525c-c22a-4e85-bbb7-d4ddc7c08d00.png?resizew=657)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707ea658f3a9359f5740d5aab48f7948.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da322ac8867e8a47c6588601078abf18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9355031ea0b2dc9cef3777621bc6d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bbf68714436abcc9a8fdc01bd04895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
(1)填写上图中第四个图中y的值为______,第五个图中y的值为______.
(2)通过探索发现,通电话次数y与该班级人数x之间的关系式为______,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956217477d74266241194f56871c3d5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
(3)若九年级1班全体女生相互之间共通话276次,问:该班共有多少名女生?
您最近一年使用:0次