1 . 如图①是杭州亚运会的徽标中的钱江潮头,可近似地看成是顶点在y轴上的二次函数,如图②所示,已知
,
.当潮头以2个单位每秒的速度向x轴正方向移动的过程中,若记潮头起始位置所在的二次函数图象与坐标轴三个交点围成的面积为
,则经过______ 秒后,潮头所在的抛物线与坐标轴的三个交点围成的面积恰好为
面积的一半.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c78f77e5b86ccd537e5f027de9ffe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2 . 用一根长
的篱笆围成一个矩形场地,长和宽分别为多少时,矩形场地的面积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c758c27bec97c234d1d818c40f3d3f.png)
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3 . 某校准备在校园里利用围墙(墙可用最大长度为
)和
长的篱笆墙,围成Ⅰ、Ⅱ两块矩形开心农场.某数学兴趣小组设计了三种方案(除围墙外,实线部分为篱笆墙,且不浪费篱笆墙),请根据设计方案回答下列问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/c0ceb18a-7264-4c18-b3e5-116fcfc93ef2.png?resizew=472)
(1)方案一:如图①,全部利用围墙的长度,但要在Ⅰ区中留一个宽度
的矩形水池,且需保证总种植面积为
,试确定
的长;
(2)方案二:如图②,使围成的两块矩形总种植面积最大,请问
应设计为多长?此时最大面积为多少?
(3)方案三:如图③,在图中所示三处位置各留
宽的门,且使围成的两块矩形总种植面积最大,请问
应设计为多长?此时最大面积为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c47873676240ca613e99ef35dfbcbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa95874b57afccaf193c257d437e5a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/c0ceb18a-7264-4c18-b3e5-116fcfc93ef2.png?resizew=472)
(1)方案一:如图①,全部利用围墙的长度,但要在Ⅰ区中留一个宽度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/701963b13ecad434a973ec160aff66f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db87a52f53e89518495e6dd6af125502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(2)方案二:如图②,使围成的两块矩形总种植面积最大,请问
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)方案三:如图③,在图中所示三处位置各留
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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4 . 在等边三角形
中,点
分别边
上.
(1)如图1,若将等边三角形
沿
翻折,点
恰好落在边
上的点
处,
①求证:
;
②若
,若设
,求
与
的函数关系式及
的最值.
(2)尺规作图:在
边上求作一点
使
,(不写作法,保留作图痕迹,请在图2中找出所有符合条件的点
)
(3)若
,设
,若要使得(2)中只能作出唯一的点
,则
的值应该满足什么条件,请通过计算说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/fec8e38b-92ec-47a7-b65e-9ac0c6341384.png?resizew=363)
(1)如图1,若将等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684a0c147cc411b2c7f6bc71ee23102c.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfcabe92de0e6cabbbd9a3dc7910742c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01173d54eb2b5a6168d928feb0c51603.png)
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
(2)尺规作图:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add60595ecea5d00ff1fbb2a5409be73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c142cedde260a13bb42b9c34fe98fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a29927656edc488a91e9969d4ff43bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 一块材料的形状是锐角三角形
,边
,高
,把它加工成正方形零件如图
,使正方形的一边在
上,其余两个顶点分别在
,
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/1b69fc55-c639-4f3e-b7c0-40c55cf96834.png?resizew=342)
(1)求这个正方形零件的边长;
(2)如果把它加工成矩形零件如图
,问这个矩形的最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf57eef2bac6f23b54d87bd128fac25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b268b2129e91d0af3423f2c001653d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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://img.xkw.com/dksih/QBM/editorImg/2023/12/27/1b69fc55-c639-4f3e-b7c0-40c55cf96834.png?resizew=342)
(1)求这个正方形零件的边长;
(2)如果把它加工成矩形零件如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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6 . 如图,已知锐角三角形
,点A在三角形内,
,
,
.作
的外接圆
,交
于点F,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/afdbeecc-917e-43e1-9b5f-2be956104cdc.png?resizew=132)
(1)求证:
.
(2)若
,
,
①求
的取值范围.
②求
的面积S的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b03bf58cba56d1b98a8a457982870b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df96f073bbcf475cf3a4e2b3b7c7edf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/afdbeecc-917e-43e1-9b5f-2be956104cdc.png?resizew=132)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916aa68e47334ba3b95cd7d99f67c6b3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cedd51383f8f047f565191b128cec637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7aafc14893896f4f908f2deb53c9f65.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
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2023-12-28更新
|
62次组卷
|
2卷引用:浙江省杭州市临平区2023-2024学年九年级上学期12月月考数学试题
7 . 某校在基地参加社会实践活动中,带队老师考问学生:基地计划新建一个矩形的生物园地,一边靠旧墙(墙足够长),另外三边用总长69米的不锈钢栅栏围成,与墙平行的一边留一个宽为3米的出入口,如图所示,如何设计才能使园地的面积最大?有两位学生对此产生了争议.请根据信息,解决问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/67b4215d-9c91-400b-b6a1-49797e0b222a.png?resizew=325)
(1)设
米,试用含x的代数式表示
的长;
(2)请你判断谁的说法正确,为什么?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/67b4215d-9c91-400b-b6a1-49797e0b222a.png?resizew=325)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e1dbdca5a7bb6d9085fef086b1a2026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)请你判断谁的说法正确,为什么?
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8 . 如图,某工地在直角墙角处,用可建60米长围墙的建筑材料围成一个矩形堆物场地,中间用同样的材料分隔为两间.
(1)若所围成的矩形
和矩形
的面积分别是
和
,求
的长.
(2)当
的长为多少时,所围成的矩形
的面积最大?并求出最大面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/8a282cd3-e952-4e76-898b-b0d20c1f24fb.png?resizew=176)
(1)若所围成的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9faef4dbe9f0c5dba48b2ef8861d5972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92057add5c62908986c807400deac166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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9 . 设边长为
的正方形的面积为
,则
关于
的函数图象大致是( )
![](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)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 如图,用一段长为30米的篱笆围成一个一边靠墙的矩形菜园
,且在边
处设计有1米宽的通道方便出入,设
边所用的篱笆长为
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/b17f5972-aa4e-47e5-a504-2411a41692ad.png?resizew=145)
(1)请写出
与
的函数关系式,若墙足够长,请求出菜园的最大面积;
(2)若墙的长为
米,请求出菜园的最大面积(可用
的式子表示)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/b17f5972-aa4e-47e5-a504-2411a41692ad.png?resizew=145)
(1)请写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若墙的长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2995a4f74a9db650d048a55ef66a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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