1 . 如图,一边靠墙(墙足够长),其他三边用
长的篱笆围成一个矩形
花园,这个花园的最大面积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/e4202d44-eae8-4606-8429-520c3b9d0aff.png?resizew=142)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74dee2e8849924124cbb31f9c6f15479.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/e4202d44-eae8-4606-8429-520c3b9d0aff.png?resizew=142)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 如图,在
中,
,点
是
边上的一个动点,点
分别在
边上,四边形
是矩形.
,矩形
的面积为
,试确定
与
之间的函数关系式.
(2)当
为何值时,
有最大值,最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db68fcb5aae66ef671a79d0299dd9ed7.png)
![](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/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/887721a843b2dc8e947cc42d09868e33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c60e55bab172b9a85f62514f5a372f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7854ba94e2a2b48442b403070290d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c60e55bab172b9a85f62514f5a372f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
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名校
3 . 如图,用一段长为
的篱笆围成一个一边靠墙的矩形菜园,墙长为
.设矩形菜园的边
的长为
,面积为
,其中
.
关于
的函数解析式,并求出
的取值范围;
(2)当该矩形菜园的面积为
.求边
的长;
(3)当边
的长为多少时,该矩形菜园的面积最大?最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1611d15c7e1e4ab4a4a61537b3989d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d4166fee97516ad1b1d4759a8e4ce6.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://staticzujuan.xkw.com/quesimg/Upload/formula/21a98c968a7653c11f184a43851941c0.png)
![](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)当该矩形菜园的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74d839d5a6907220b2bfecce3f792145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)当边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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3卷引用:湖北省荆门市京山市2023-2024学年九年级下学期期中数学试题
名校
4 . 某饭店特制了一批高脚杯,分为男士杯和女士杯(如图1),相关信息如下:
根据以上素材内容,丵试求解以下问题:
(1)求抛物线
和抛物线
的解析式;
(2)当杯子水平放置及杯内液体(无泡沫)静止时,若男士杯中液体与女士杯中液体最深处深度均为
,求两者液体最上层表面圆面积相差多少?(结果保留
)
(3)当杯子水平放置及杯内液体(无泡沫)静止时,若男士杯中液体与女士杯中流体最深处深度相等,两者液体最上层表面圆面积相差
,求杯中液体最深度为多少?
| 内容 | |||||
| ![]() 高脚杯:如图1,类似这种杯托上立着一只细长脚的杯子.从下往上分为三部分:杯托,杯脚,杯体.杯托为一个圆;水平放置时候,杯脚经过杯托圆心,并垂直任意直径;杯体的水平横截面都为圆,这些圆的圆心都在杯脚所在直线上. | |||||
|
![]() ![]() ![]() ![]() ![]() 图2坐标系中,特制女士杯可以看作线段 ![]() ![]() ![]() | |||||
|
|
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c288e6de7e470011569e2b7f870779.png)
(2)当杯子水平放置及杯内液体(无泡沫)静止时,若男士杯中液体与女士杯中液体最深处深度均为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56817c785e9fa0c8616ec0a58358d634.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
(3)当杯子水平放置及杯内液体(无泡沫)静止时,若男士杯中液体与女士杯中流体最深处深度相等,两者液体最上层表面圆面积相差
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2e4ce1055f76c7ae91c27ebc1cff4de.png)
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2023-12-14更新
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9卷引用:福建省泉州实验中学2023-2024学年九年级上学期期中数学试题
5 . 如图,某中学准备围建一个矩形苗圃,其中一边靠墙,另外三边用长为
米的篱笆围成,若墙长为
米,设这个苗圃垂直于墙的一边长为
米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/19250b17-838e-4d18-9fa0-0e18990ba1e6.png?resizew=129)
(1)若苗圃园的面积为
平方米,求
的值;
(2)若平行于墙的一边长不小于
米,求这个苗圃园的面积有最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b837fd9c52f60bfb3b6852733abc790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/19250b17-838e-4d18-9fa0-0e18990ba1e6.png?resizew=129)
(1)若苗圃园的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若平行于墙的一边长不小于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
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6 . 如下图,要围一个矩形菜园
,其中一边
是墙,且
的长不能超过
,其余的三边
,
,
用篱笆,且这三边的和为
,则菜园
面积的最大值为______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a2a22b619012e9a21727fad38491e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a9166a6de3f2debeb60a7f297f5fd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/8332f3b3-799e-4300-b0e8-63b7f60db9bc.png?resizew=194)
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7 . 如图,一块矩形土地
由篱笆围着,并且由一条与
边平行的篱笆
分开.已知篱笆的总长为
(篱笆的厚度忽略不计),当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
______ m时,矩形土地
的面积最大.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a951496357f556654818f843e0c433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/a265745e-208b-4f98-adcb-1b6b0475a775.png?resizew=131)
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8 . 某居民小区要在一块一边靠墙(墙长20米)的空地上修建一个矩形花园
,花园的一边靠墙,另三边用总长40米的栅栏围成(如图所示).若设花园的
边长为x米,花园的面积为y平方米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/1f6afeef-3f0d-47fb-b1af-cea641961bd3.png?resizew=151)
(1)求y与x之间的函数关系式,并写出自变量x的取值范围;
(2)当x是多少时,矩形场地面积y最大?最大面积是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/1f6afeef-3f0d-47fb-b1af-cea641961bd3.png?resizew=151)
(1)求y与x之间的函数关系式,并写出自变量x的取值范围;
(2)当x是多少时,矩形场地面积y最大?最大面积是多少?
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2023-12-13更新
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2卷引用:广东省惠州市惠阳区竹贤学校初中部2023-2024学年九年级上学期期中数学试题
9 . 先阅读理解下面的例题,再按要求解答下列问题:
例题:求代数式
的最小值.
解:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b4dd70e2b12a8eb86b53d37b7f7f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9b80370647414e4ca23671aa226cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ccbac38ce93406fd78397cf3ae6d28.png)
代数式
的最小值为4.
(1)求代数式
的最小值;
(2)某居民小区要在一块一边靠墙(墙长15米)的空地上建一个长方形花园
,花园一边靠墙,另三边用总长为20米的栅栏围成.如图,设
米,请问:当
取何值时,花园的面积最大?最大面积是多少?
例题:求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ddef7da283ca0722d6a41eef50a922.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b4dd70e2b12a8eb86b53d37b7f7f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9b80370647414e4ca23671aa226cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ccbac38ce93406fd78397cf3ae6d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ddef7da283ca0722d6a41eef50a922.png)
(1)求代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18705d5d5306e4ce3874f61cd4c4574c.png)
(2)某居民小区要在一块一边靠墙(墙长15米)的空地上建一个长方形花园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c7a3d679b4dae63575903387a76ce45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/192cd775-2c7b-4cff-b6e4-eabeaaae67c9.png?resizew=235)
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10 . 如图,抛物线
连接
交x 轴于点E,连接
,
,抛物线与x 轴交于A,B 两点,与y 轴的正半轴交于点C,其顶点为D.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/87587387-6349-4e58-903a-705c3d804224.png?resizew=148)
(1)求C,D 两点的坐标(用含a 的式子表示);
(2)
的面积是
面积的几倍?
(3)当
是直角三角形时,直接写出此时a 的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077664ec31fad3d075ccb2c9a9d57e70.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/87587387-6349-4e58-903a-705c3d804224.png?resizew=148)
(1)求C,D 两点的坐标(用含a 的式子表示);
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693c41862bf36d13d1579ccac1a056e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea6d9c2d8ac14542770b757662a79e2.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b506b0941433a6a5d5387d0ec95596ea.png)
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2023-12-12更新
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2卷引用:河南省新乡市卫滨区铁路高级中学2023-2024学年九年级上学期期中数学试题