题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081241-26359.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081241-90029.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081241-79289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-66142.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-42798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-42798.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-42798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-61129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-30822.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-53505.jpg)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-42769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-41924.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-14500.gif)
由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-23809.gif)
应用二元均值不等式,
得
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-55137.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-99764.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-69257.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-79106.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-52277.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081243-63139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081244-50143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081244-62708.gif)
因此,
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-42798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-61129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081244-36365.gif)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081244-91381.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081244-99777.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081242-30822.gif)
核心考点
试题【某单位决定投资元建一仓库(长方体状),高度恒定,它的后墙利用旧墙不花钱,正面用铁栅,每米造价元,两侧墙砌砖,每米造价元,顶部每平方米造价元,试问:(1)仓库面积】;主要考察你对简单的线性规划等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081232-64073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081229-71494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081229-70801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081132-84859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081132-37201.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081132-29792.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081118-19937.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081118-26617.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081108-91232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081108-52246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081108-86955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081108-39883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081108-26683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017081108-86825.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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