名校
解题方法
1 . 如图所示,某房地产开发公司计划在一楼区内建一个长方形公园
,公园由长方形的休闲区
(阴影部分)和环公园人行道组成.已知长方形休闲区
的面积为
m2,人行道的宽分别为4m和10m.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/0de3db60-66a2-4a35-b6c1-e772211dedf4.png?resizew=212)
(1)设长方形休闲区的长
m,求长方形公园
所占面积
关于
的函数
的解析式;
(2)要使长方形公园
所占总面积最小,长方形休闲区
的长和宽应为多少m?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1573487be070cf0847e22a2cb58064b6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/0de3db60-66a2-4a35-b6c1-e772211dedf4.png?resizew=212)
(1)设长方形休闲区的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51cc3396bef1f0b03d12fd4c88f2998a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/3888740fa8b552b55b4a0c8ae4166007.png)
(2)要使长方形公园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
您最近一年使用:0次
2022-11-02更新
|
120次组卷
|
7卷引用:广西桂林市桂林中学2020-2021学年高二下学期期中数学(文)试题