1 . 如图,矩形
的四个顶点都在
的边上,
于点D,交
于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/e6a94be4-4411-47dd-b456-c6adc16d50ad.png?resizew=205)
(1)求证:
;
(2)若
,
,设
的长度为x,矩形
的面积为y,则矩形
的面积是否有最大值?如果有,请求出矩形
面积的最大值:如果没有,请说明理由.
![](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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/e6a94be4-4411-47dd-b456-c6adc16d50ad.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a795fcbf55b39b09e0b3f77f6df59f93.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf7679c8b4b1e442ce4286d4b0e9c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2176dac04a8b410e319342fb8e895b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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2 . 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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3 . 如图,矩形
为大同古城管理部门计划在古城东南邑围建的一个小型表演场地,其中两边靠墙(墙足够长),另外两边用长为
的隔离带(虚线部分)围成,求所围成矩形
的最大面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1611d15c7e1e4ab4a4a61537b3989d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/a82b6bc7-6b90-429c-8959-7d9ad5074cfa.png?resizew=162)
您最近一年使用:0次
2023-12-23更新
|
72次组卷
|
2卷引用:山西省大同市2023-2024学年九年级上学期期中数学试题
4 . 如图1,有一堵长为50米的墙MN,某工程队想借助这堵墙用铁皮栅栏围成一个长方形场地
,中间再用铁皮栅栏分割形成两个长方形,现有总长为120米的铁皮栅栏(厚度不计)可供使用,设
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/04aa4a98-1bd0-44e5-ad6f-2f6b0736daf9.png?resizew=387)
(1)
长为______米,长方形
的面积为______平方米.(用含
的代数式表示)
(2)若围成的长方形场地
的面积为1125平方米,求
的长;
(3)若小明想在
边上用其他材料做两个门,每个门的宽均为1.5米.问能否使长方形
的面积为1290平方米?如果能行,请求出
的长;如果不能,请说明理由.
(4)如果墙
足够长,求
的长为多少时可使小明设计的长方形场地面积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/04aa4a98-1bd0-44e5-ad6f-2f6b0736daf9.png?resizew=387)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若围成的长方形场地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若小明想在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(4)如果墙
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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5 . 某加工厂要加工一种抛物线型钢材构件,如图所示,该抛物线型构件的底部宽度
米,顶点
到底部
的距离为
米.将该抛物线放入平面直角坐标系中,点
在
轴上.其内部支架有两个符合要求的设计方案:
方案一:“川”字形内部支架(由线段
构成),点
在
上,且
,点
在抛物线上,
均垂直于
;
方案二:“
”形内部支架(由线段
,
,
构成),点
,
在
上,且
,点
,
在抛物线上,
,
均垂直于
分别是
,
的中点.
(1)求该抛物线的函数表达式;
(2)该加工厂要用某一规格的钢材来加工这种构件,那么哪一个方案的内部支架节省材料?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3c3a268a9bc5129a526892ddf3294d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/457b8ae9-4ddf-496a-b496-56991de20dba.jpg?resizew=365)
方案一:“川”字形内部支架(由线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24114e7b48ca4f2f144b9fd52b37fdeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9639b9ef86614ac32837a67dbd468c96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1e1e6cda0c168fb3146387db239004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663aa29cf0f19e37809eb6ea70c4e767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24114e7b48ca4f2f144b9fd52b37fdeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
方案二:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc3257f37be3274a38ec21b7ce9ebb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a652c200f98cb5802c2bcafc7cdb0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc3257f37be3274a38ec21b7ce9ebb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c1d377a7d5f8d7dc76f8928271e04c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc3257f37be3274a38ec21b7ce9ebb7.png)
(1)求该抛物线的函数表达式;
(2)该加工厂要用某一规格的钢材来加工这种构件,那么哪一个方案的内部支架节省材料?请说明理由.
您最近一年使用:0次
6 . 如图,某学校开展劳动实践活动,在校园一角设计了一块蔬菜种植园地,现要用
的篱笆围成一个矩形园地,其中一面靠墙(墙长
),设该矩形蔬菜种植园地垂直于墙的一边长为
,矩形蔬菜种植园地的面积为
.
(1)求出
与
的函数解析式.
(2)当矩形蔬菜种植园地的面积为
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f256afee1098dac22f423b19b43c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f631cfdf4666db95beb923072ced8d95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/b1e029b6-4855-4705-ac5c-76717dc2161b.png?resizew=199)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当矩形蔬菜种植园地的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d904c7c5a1f489a759b9392dbec790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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7 . 根据以下素材,完成项目式探索任务:
问题的提出
根据以下提供的素材,在总费用(新墙的建筑费用与门的价格和)不高于6400元的情况下,如何设计最大饲养室面积的方案?
素材1:如图是某农场拟建两间矩形饲养室,饲养室的一面靠现有墙,中间用一道墙隔开,计划中建筑材料可建围墙的总长为
米,开2个门,且门宽均为1米.
素材2:2个门要求同一型号,有关门的采购信息如表.
素材3:与现有墙平行方向的墙建筑费用为400元/米,与现有墙垂直方向的墙建筑费用为200元/米.
问题的提出
根据以下提供的素材,在总费用(新墙的建筑费用与门的价格和)不高于6400元的情况下,如何设计最大饲养室面积的方案?
素材1:如图是某农场拟建两间矩形饲养室,饲养室的一面靠现有墙,中间用一道墙隔开,计划中建筑材料可建围墙的总长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/cbdf4119-2ab0-49dc-85fe-1282ad1c5518.jpg?resizew=174)
素材2:2个门要求同一型号,有关门的采购信息如表.
型号 | A | ![]() | ![]() |
规格(门宽) | 1米 | ![]() | 1米 |
单价(元) | 250 | 280 | 300 |
任务1 | 确定饲养室的形状 设 ![]() ![]() ![]() |
任务2 | 探究自变量![]() |
任务3 | 确定设计方案 我的设计方案是选型号 门,当 ![]() ![]() |
您最近一年使用:0次
8 . 问题提出(1)当
时,二次函数
的最大值为______.
问题探究(2)已知二次函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c22804f52986009170586c673342d41.png)
是常数,
的图象经过
两点,平移该函数的图象,使其顶点始终在直线
上,求平移后所得抛物线与
轴交点的纵坐标的最大值.
问题解决(3)某养殖户利用一段围墙(围墙足够长)为一边,用总长为
的围网围成了如图所示的三块矩形区域,且这三块矩形区域的面积相等.设
的长度为
,矩形区域
的面积为
,当
为何值时,
有最大值?最大值是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f22c4898e2a23e0e888b69d79719f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236d825b994ee9c28e5d5479a57b8ed.png)
问题探究(2)已知二次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c22804f52986009170586c673342d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51bc93f7a62885a5cac145ffab33528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28b08682efa2692b052f64fe1448fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297797f0c11325bcc4b4923e37d6be5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
问题解决(3)某养殖户利用一段围墙(围墙足够长)为一边,用总长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ec72d07385ed62ec9540083958be2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3bde6ef2ee5b749b4d48d706543cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a20728e9a9e3018723f2a86f24f332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/720c4897-3079-47e6-8590-10366813679d.png?resizew=130)
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2023-12-07更新
|
101次组卷
|
3卷引用:陕西省安康市岚皋县2023-2024学年九年级上学期期中数学试题
9 . 如图,某养殖户用
长的篱笆围成一个长方形养殖园,中间的两条篱笆隔离栏将这个长方形养殖园分割成三个较小的长方形,则围成养殖园的最大面积是______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa95874b57afccaf193c257d437e5a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
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10 . 在2024年元旦即将到来之际,学校准备开展“冬日情暖,喜迎元旦”活动,小星同学对会场进行装饰.如图1所示,他在会场的两墙
、
之间悬挂一条近似抛物线
的彩带,如图2所示,已知墙
与
等高,且
、
之间的水平距离
为8米.
,
的高度是 米,抛物线的顶点坐标为 ;
(2)为了使彩带的造型美观,小星把彩带从点
处用一根细线吊在天花板上,如图3所示,使得点
到墙
距离为3米,使抛物线
的最低点距墙
的距离为2米,离地面2米,求点
到地面的距离;
(3)为了尽量避免人的头部接触到彩带,小星现将
到地面的距离提升为3米,通过适当调整
的位置,使抛物线
对应的二次函数的二次项系数始终为
,若设点
距墙
的距离为
米,抛物线
的最低点到地面的距离为
米,探究
与
的关系式,当
时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372ad1814216fb7ebe39a0e067cf70be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)为了使彩带的造型美观,小星把彩带从点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)为了尽量避免人的头部接触到彩带,小星现将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef06a3c4befc30945469d55bea138bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2023-11-18更新
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435次组卷
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6卷引用:贵州省遵义市红花岗区四校联考2023-2024学年九年级上学期期中数学试题