题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094511-66995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094512-58343.png)
答案
解析
试题分析:由函数的解析式可以看出,函数的零点呈周期性出现,且法自变量趋向于正无穷大时,函数值在
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094512-67113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094512-67113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094512-67256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094512-85147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094513-37359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094513-75373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094512-67256.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094502-70693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094503-69887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094503-43244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094503-32023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094504-59805.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094312-14320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094312-86108.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094313-96308.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094313-65863.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094313-28674.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094314-62429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094314-64539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094259-19341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094259-24423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094259-19341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094259-39818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094259-57636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094300-84790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094300-52412.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094301-15971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094301-15362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094302-95195.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094302-72021.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094302-17798.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094303-90401.png)
④
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094303-70075.png)
上述结论中正确结论的序号是________.
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094243-90950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094244-41612.png)
①对任意的
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094244-80449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094244-60149.png)
②
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094245-61081.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094245-38292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094245-21595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094245-55704.png)
称这样的函数为“友谊函数”.
请解答下列各题:
(1)已知
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094244-41612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094246-89425.png)
(2)函数
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094246-87111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094243-90950.png)
(3)已知
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094244-41612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094246-97300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094246-57271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094246-41751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200204/20200204094247-70672.png)
(1)开发商最早在第几年获取纯利润?
(2)若干年后开发商为了投资其它项目,有两种处理方案:①纯利润最大时,以10万元出售该楼;②年平均利润最大时以46万元出售该楼.问哪种方案更优?并说明理由?
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