题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-87864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-27708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-96268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-14500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-12569.png)
(Ⅰ)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-87864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-57818.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-75747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-10799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-34176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031158-80656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031158-31984.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031158-23087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031158-25021.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031159-78336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031159-25965.png)
解析
试题分析:(1)将
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-27708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-14500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031159-58280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-57818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031159-96200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-34176.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031200-44104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031158-23087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031158-25021.png)
试题解析:(1)证明:由已知得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031200-17381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031200-34699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-96268.png)
∴数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-87864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031200-48262.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031157-12569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031200-82087.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031201-60174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031159-96200.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031200-44104.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031158-23087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031201-65275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031201-43705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031156-96268.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031201-92340.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031138-73747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031138-13133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031138-91176.png)
A.420 | B.380 | C.210 | D.140 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031120-54758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031120-20113.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031120-63799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031120-98348.png)
(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031121-50998.png)
(Ⅱ)表中数82共出现 次.
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031058-14724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031058-84572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031059-10053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031059-81756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031059-22796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031059-69469.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031100-18815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031059-22796.png)
(Ⅱ)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031100-68816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031100-81319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031100-31509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031100-48383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031101-85927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031101-12851.png)
成12%和6%的药水各10千克,实际要求两个喷雾器中的农药的浓度是一样的,现在只有两个容量为1千
克的药瓶,他们从A、B两个喷雾器中分别取1千克的药水,将A中取得的倒入B中,B中取得的倒入A
中,这样操作进行了n次后,A喷雾器中药水的浓度为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031040-69560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031040-57326.png)
(1)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031041-61877.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031041-75295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031041-80279.png)
(3)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012031041-75295.png)
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