1 . 如图,用一段长
的篱笆围成一个一边靠墙(墙足够长)的矩形菜园
,设菜园的一边
长为
,菜园的面积为
,求当x为何值时,围成的菜园的面积最大?最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c758c27bec97c234d1d818c40f3d3f.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/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baaa2d65026770c5505f8adeb450e43b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/62a3aa2e-bfc6-4572-870b-5c0e8bbf47ee.png?resizew=163)
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2023九年级上·全国·专题练习
2 . 如图,矩形
内接于
(矩形各顶点在三角形边上),E,F在
上,H,G分别在
,
上,且
于点D,交
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/2566550a-a120-4849-bc53-6c202649cf78.png?resizew=174)
(1)求证:
;
(2)若
,
,设
,矩形
的面积为y,求出y与x之间的函数表达式,并写出自变量x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/2566550a-a120-4849-bc53-6c202649cf78.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f996335b6f669172a83bb875392d1a7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45321df06ac830383be37e07e3be533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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2024-01-28更新
|
178次组卷
|
3卷引用:专题04 相似三角形(知识串讲+热考题型+真题训练)-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)
(已下线)专题04 相似三角形(知识串讲+热考题型+真题训练)-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)(已下线)专题04 图形的相似(知识串讲+热考题型+真题训练)-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(北师大版)(已下线)专题06 图形的相似(知识串讲 热考题型 真题训练1)-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(苏科版)
名校
3 . 某农场要建矩形的饲养室,如图所示,一面靠着现有足够长的墙,其他三面用材料建设围墙,在中间再建一道墙隔开,并在两处各留
宽的门,已知计划中的材料可建墙体总长为
(不包括门),则能建成的饲养室最大总占地面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/d08dcb9a-6638-4b07-bede-0b402d89398f.png?resizew=182)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d690befd9571e1cf9a80388ab2b68.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/d08dcb9a-6638-4b07-bede-0b402d89398f.png?resizew=182)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 如图,有长为的篱笆,一边利用墙(墙长不限),则围成的花圃
的面积最大为
.
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2024-01-07更新
|
109次组卷
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2卷引用:浙江省杭州市2023-2024学年九年级上学期期中数学试题
5 . 如图,抛物线
与
轴交于点
、
,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/c165c024-bc5f-4b17-a30f-b5560ae0cfac.png?resizew=140)
(1)求抛物线的表达式.
(2)已知点
为
轴上一点,点
关于直线
的对称点为
.
①当点
刚好落在第二象限的抛物线上时,求出点
的坐标.
②点
在抛物线上(点
不与点
、点
重合),连接
,
,
,是否存在点
,使
为等腰直角三角形?若存在,请求出点
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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c33700c3358cbbd8db376f9f0613b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb898663f98b8400a897913b4d3102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/c165c024-bc5f-4b17-a30f-b5560ae0cfac.png?resizew=140)
(1)求抛物线的表达式.
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79039b211d151710a15fc9dda11d6225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba2d49042c812a164167a8e42fde290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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2024-01-05更新
|
133次组卷
|
2卷引用:浙江省温州市新希望联盟2023-2024学年九年级上学期期中数学试题
6 . 根据以下素材,探究完成任务
设计路的宽度 | ||
材料1 | 为培养学生劳动实践能力,某研学基地计划在一块形状为三角形的土地上开辟出一块矩形土地(如图所示)供种菜使用,其中![]() ![]() ![]() ![]() ![]() | |
材料2 | 为了方便学生使用,计划在开辟出来的长方形土地上建造三条如图所示的宽均为a(![]() | |
问题解决 | ||
任务1 | 若所开辟的土地为正方形,求该正方形![]() | |
任务2 | 若所开辟的土地为矩形,求矩形![]() | |
任务3 | 当![]() |
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7 . 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)
您最近一年使用:0次
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8 . 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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9 . 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
10 . 在美化校园的活动中,某兴趣小组想借助如图所示的直角墙角(两边是够长),用28m长的篱笆围成一个矩形花园
(篱笆只围
,
两边),设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/fe3eea9a-6cb2-4465-ba6e-59dca67c72f0.png?resizew=102)
(1)若花园的面积为
,求
的值;
(2)若在
处有一棵树与墙
,
的距离分别是
和
,要将这棵树围在花园内(含边界,不考虑树的粗细),求花园面积S的最大值.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ac400e3f5ba8b945bbef83db8611b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/fe3eea9a-6cb2-4465-ba6e-59dca67c72f0.png?resizew=102)
(1)若花园的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb92c9032804326713c7b4feea53f40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1e0bd4fe8afb14b572852121cef83d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39ea92883fe24b097c9a881ef8c92eb1.png)
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