题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083212-92783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083213-65579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083213-10838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083213-57525.png)
答案
解析
对于任意正整数n,都有
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083213-10838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083213-89347.png)
于是有
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083214-27080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083214-23630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083214-30387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083214-14976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083214-83153.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083215-94722.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083215-52863.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083226-71225.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083144-38440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083145-53209.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083145-95837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083145-95837.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083145-19060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083130-23485.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083130-89775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083131-71208.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083131-71208.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083131-33012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083131-38821.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083131-49173.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083132-41115.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083132-44282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083132-78444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083132-36259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083132-49597.gif)
(II) 设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083133-23692.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083133-19110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083133-59757.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083133-72087.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083130-89775.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083045-35193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083045-81081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083046-83875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083046-79366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083046-44888.png)
A.155 | B.160 | C.172 | D.240 |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083010-44278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083010-80418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083010-53825.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083021-78534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083021-17013.png)
①当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083022-57465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083022-21868.png)
②若存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083022-44316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083022-54436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083022-29480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011083023-52870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011082950-73090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011082950-73090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011082950-77337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011082950-87880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011082950-90251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011082951-82578.png)
“_________________________________________”.
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