题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110510-82817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110511-18103.png)
(1) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110511-78765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110511-47665.png)
(2) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110511-57282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110512-90163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110512-10398.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110512-52288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110512-88408.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110512-41555.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110513-83508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110513-82159.png)
(2)根据(1)可知
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110513-75008.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110513-78303.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110514-83774.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110514-86802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110514-73044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110514-46129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110515-43097.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110515-59475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110515-88886.png)
综上:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110515-88886.png)
(2)、
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110513-75008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110516-71631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110516-44545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110516-32327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110516-55851.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110500-46945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110501-57580.png)
(1)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110501-22522.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110502-65693.png)
(3)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110502-36666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110454-27907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110454-58642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110455-57533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110455-39418.png)
A.99 | B.100 | C.96 | D.101 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110447-40069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110447-60138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110447-40069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110447-27495.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110439-92033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110439-79581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110439-32774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110439-63794.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110439-92033.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110440-91572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110439-79581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110440-46851.png)
(3)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110440-35729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110439-79581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110440-35433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110425-44934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110425-27686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110425-44934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110425-44934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110425-44681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110425-79912.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012110428-70493.png)
(2)依上述预测,从今年起该企业至少经过多少年,进行技术改造后的累计纯利润超过不进行技术改造的累计纯利润.
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