1 . 如图,在直角坐标系
中,抛物线
与
轴的正半轴相交于点
,与
轴的正半轴相交于点
,它的对称轴与
轴相交于点
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/8a412032-e230-46de-96f6-9367b259f858.png?resizew=195)
(1)求此抛物线的表达式;
(2)如果点
在此抛物线上,
,垂足为
,
与线段
相交于点
,且
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d039de5bf810e3ff6b0b6096fa48d462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/8cf77a054bc1e33f151cea26a7cceac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/8a412032-e230-46de-96f6-9367b259f858.png?resizew=195)
(1)求此抛物线的表达式;
(2)如果点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb73d10046e64d6f36e2dfdc9b9e6145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d02001b7a2644c91435dcda64b981d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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2 . 已知抛物线
的顶点
在直线
上,直线
与
轴的交点为
点.
(1)求点
的坐标与
的值;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd985f8ab48728458c277ab75e84be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae652daf6059ff386f99bef2210518c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/28/1cc402ec-bf39-4710-a10a-526a54a4b066.png?resizew=152)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
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20-21九年级下·全国·课后作业
3 . 相框边的宽可影响放入的相片的大小,如图所示,相框长
,宽
.设相框边的宽为
,相框内的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/ae0feb24-8563-4bc5-b4ad-914b4ea7849c.png?resizew=144)
(1)写出
关于
的函数解析式.
(2)在这个函数解析式中,自变量
的取值范围是什么?
(3)当
取1,1.5,2时分别可以放入多大面积的相片?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d8cc740f1c73ccff0db9e7f9b45bbd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a79fa14c8f71cdd5af3ba00ac5824a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3160fce05b551569b8c7b5de6dd8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d740004cfdade4c185f722dadc27e15.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/ae0feb24-8563-4bc5-b4ad-914b4ea7849c.png?resizew=144)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)在这个函数解析式中,自变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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2022九年级下·江苏·专题练习
4 . 已知块边长为
的正方形草地.
(1)如图1,先将正方形草地的一条边减少
,再将另一边增加
,设变化后的草地的面积为
,则
(填“是“或“不是”)关于x的函数.
(2)如图2,将正方形草地的相邻两边各增加
,设扩充后的草地的面积为
,
①写出y与x之间的函数关系式,
②当
时,求y的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/97edab1e-43ff-4e62-bca1-1edff1303f93.png?resizew=395)
(1)如图1,先将正方形草地的一条边减少
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/025f975ede549e4f1dd5dfffba67ebe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baaa2d65026770c5505f8adeb450e43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
(2)如图2,将正方形草地的相邻两边各增加
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
①写出y与x之间的函数关系式,
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/224d30ca84f1aeeeda7a718e751a4925.png)
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2023-04-27更新
|
278次组卷
|
5卷引用:专题5.7 二次函数的实际应用-几何面积问题(专项训练)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(苏科版)
(已下线)专题5.7 二次函数的实际应用-几何面积问题(专项训练)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(苏科版)(已下线)专题2.4 二次函数的应用(能力提升)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(北师大版)(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)河南省周口市商水县城关乡第二初级中学2022-2023学年八年级下学期3月月考数学试题十六 实际问题与二次函数(第1课时)
名校
5 . 如图是一块铁皮余料,将其放置在平面直角坐标系中,底部边缘
在x轴上,且
,外轮廓线是抛物线的一部分,对称轴为y轴,高度
,现计划将此余料进行切割.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/30f699ba-ed81-45c7-8e02-df81b6c15c07.png?resizew=154)
(1)若切割成正方形,要求一边在底部边缘
上且面积最大,求此正方形的面积;
(2)若切割成矩形,要求一边在底部边缘
上且周长最大,求此矩形的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d48ed33945cc85c834deb7c8a02df7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1650ff5e4f42b77e1d6d9edfef95b2d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/30f699ba-ed81-45c7-8e02-df81b6c15c07.png?resizew=154)
(1)若切割成正方形,要求一边在底部边缘
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若切割成矩形,要求一边在底部边缘
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2023-03-29更新
|
231次组卷
|
4卷引用:湖北省武汉市第三寄宿中学2022-2023学年九年级上学期9月学业质量检测数学试卷
6 . 如图,已知抛物线
经过
两点,与x轴的另一个交点为A.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/b6613c0b-105e-4454-aed7-0a3514836ed6.png?resizew=207)
(1)求抛物线的解析式;
(2)若直线
经过B,C两点,则
________;
_________;
(3)在抛物线对称轴上找一点E,使得
的值最小,直接写出点E的坐标;
(4)设点P为x轴上的一个动点,是否存在使
为等腰三角形的点P,若存在,直接写出点P的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d76f17dfa2b5e5b23d8008b7332ccd7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/b6613c0b-105e-4454-aed7-0a3514836ed6.png?resizew=207)
(1)求抛物线的解析式;
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c1972246a0a3d1c987d25205dbdd99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(3)在抛物线对称轴上找一点E,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769688bfdcb3a9e1f17548033aadc6fe.png)
(4)设点P为x轴上的一个动点,是否存在使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
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2023-02-25更新
|
528次组卷
|
3卷引用:天津市东丽区2022-2023学年九年级上学期数学期末试题
22-23九年级上·全国·单元测试
7 . 如图,将半径为
的半圆围成一个圆锥,在圆锥内接一个圆柱,当圆柱的侧面面积最大时,圆柱的底面半径是( )
![](https://img.xkw.com/dksih/QBM/2023/1/8/3148236866428928/3148951698489344/STEM/1490b54cebd045cd9315bb685f1e0b4c.png?resizew=236)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
![](https://img.xkw.com/dksih/QBM/2023/1/8/3148236866428928/3148951698489344/STEM/1490b54cebd045cd9315bb685f1e0b4c.png?resizew=236)
A.![]() | B.![]() | C.1cm | D.![]() |
您最近一年使用:0次
名校
8 . 某中学课外兴趣活动小组准备围建一个矩形苗圃园,其中一边靠墙,另外三边周长为30米的篱笆围成.已知墙长为18米(如图所示),设这个苗圃园垂直于墙的一边长为
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/4a9b6902-dc0c-4f70-aabe-5104d46a0e33.png?resizew=163)
(1)若苗圃园的面积为72平方米,求
;
(2)若平行于墙的一边长不小于8米,这个苗圃园的面积有最大值和最小值吗?如果有,求出最大值和最小值;如果没有,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/4a9b6902-dc0c-4f70-aabe-5104d46a0e33.png?resizew=163)
(1)若苗圃园的面积为72平方米,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若平行于墙的一边长不小于8米,这个苗圃园的面积有最大值和最小值吗?如果有,求出最大值和最小值;如果没有,请说明理由.
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2022-12-28更新
|
175次组卷
|
5卷引用:山东省东营市东营区实验中学(五四制)2022-2023学年九年级上学期第二次线上测试数学试题
22-23九年级上·浙江·期中
9 . 某兴趣小组想借助如图所示的直角墙角(两边足够长),用
长的篱笆围成一个矩形
(篱笆只围
,
两边),设
时,花园的面积为
.
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107140812693504/3134964868489216/STEM/308e9ce238704128965d6a14fb8d2f72.png?resizew=173)
(1)求
关于
的函数关系式;
(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
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751f74aa8918bb849dca5f2d52e067c5.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f1f46e2771c7db445146f274b25237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
![](https://img.xkw.com/dksih/QBM/2022/11/11/3107140812693504/3134964868489216/STEM/308e9ce238704128965d6a14fb8d2f72.png?resizew=173)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/78533010d6ef767b34dbf12a56f2a136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c344e177eccf78f67a14cf81a5d248c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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10 . 如图,某中学准备在校园里利用围墙的一段,再砌三面墙,围成一个矩形花园
(围墙
最长可利用
),现在已备足可以砌
长的墙的材料.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/1c989e69-db44-410a-bac8-446070c0b9a1.png?resizew=170)
(1)请设计一种砌法,使矩形花园的面积为
;
(2)请设计一种砌法,使矩形花园的面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/146ea9ed5176797da555a70bbe9602c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c758c27bec97c234d1d818c40f3d3f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/1c989e69-db44-410a-bac8-446070c0b9a1.png?resizew=170)
(1)请设计一种砌法,使矩形花园的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92057add5c62908986c807400deac166.png)
(2)请设计一种砌法,使矩形花园的面积最大.
您最近一年使用:0次
2022-12-17更新
|
128次组卷
|
3卷引用:广西壮族自治区钦州市灵山县烟墩中学2022-2023学年九年级上学期期中数学试题