如图,用一段长为
的篱笆围成一个一边靠墙的矩形菜园(矩形
),墙长为
,这个矩形的长
,菜园的面积为
,且
.
(1)求
与
之问的函数关系式,并写出自变量
的取值范围.
(2)当该菜园的长为多少
时,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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d690befd9571e1cf9a80388ab2b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66ac400e3f5ba8b945bbef83db8611b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96160910a9a3bced4acb903360f97743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9199a3de404cb13ae7710f73db5c8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/28/29cf891f-3267-4b17-8f19-ec99cb9b3e65.png?resizew=170)
(1)求
![](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)当该菜园的长为多少
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba007666deb89951641bd1e24bc174a2.png)
20-21九年级上·福建龙岩·期中 查看更多[2]
福建省龙岩市龙岩初级中学2020-2021学年九年级上学期期中数学试题(已下线)(期中期末真题汇编)第22章 二次函数 (分层精练)-【题型分类精粹】2023-2024学年九年级数学上学期期中期末复习讲练系列【考点闯关】(人教版)
更新时间:2023-09-22 15:04:48
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