题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154522-93398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-43292.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-69152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-19459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-80148.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-69152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-19459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-96369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-30164.png)
解析
试题分析:(1)由已知,
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-43292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-31101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-69152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-74855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-95380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-62627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-96369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-96369.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154525-64946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154525-76299.png)
当且仅当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154525-51934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-62627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154525-12808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-19459.png)
(2)由柯西不等式,
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154525-19020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-95380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-62627.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154523-96369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154524-30164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154526-29227.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154510-18346.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154510-82425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154510-26071.png)
(Ⅱ)当车流密度
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154510-11253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154511-74051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154501-77030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154501-36061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154501-68663.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154406-31698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154407-52893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154406-31698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154407-22399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154407-64909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154407-86141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154408-18813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154408-55500.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154358-70933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154358-65815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154358-99477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154358-93721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154358-65815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154359-32704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154359-10794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154359-27993.png)
(1)求出函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154359-10794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154359-27993.png)
(2)这种汽车使用多少年时,它的年平均费用最小?最小值是多少?
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154336-11892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204154337-30942.png)
A.1个 | B.2个 | C.无数个 | D.至多一个 |
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