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)
更新时间:2023-12-23 00:12:00
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【知识点】 图形问题(实际问题与二次函数)
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【推荐1】某学校农场打算用40米长的篱笆围成长方形的向日葵基地.设长方形的长为x米,面积为S(平方米).
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【推荐2】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