题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-86192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-86823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-29116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-86192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-20491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-45431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-45431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-20491.png)
A.7 | B.8 | C.7或8 | D.8或9 |
答案
解析
试题分析:由已知得,
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202827-92228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-86192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202827-45224.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-29116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202827-24755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202827-13890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202828-96832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202828-82788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202828-72626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202826-45431.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202543-32721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202543-99852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202544-40998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202544-49484.png)
(1)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202543-32721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202544-94710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202544-26831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202545-79731.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202545-48521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202545-76608.png)
(3)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202543-32721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202544-94710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202545-94467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202546-56796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202546-41260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202546-33433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202547-51840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202547-70949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202401-60955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202401-85331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202401-51389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202401-60383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202401-36379.png)
求第2行和第3行的通项公式
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202402-36817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202402-77976.png)
证明:数表中除最后2行外每一行的数都依次成等差数列,并求
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202402-99604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202401-60383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202402-50912.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202403-61970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202403-15505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202403-58151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202403-54566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202403-32814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202403-47529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202404-41447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202404-14963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202404-19385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202212-95044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202212-39688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202212-41498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202212-82408.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202213-36744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202213-28105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202212-95044.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202014-94858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202015-46069.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202015-27045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202006-57499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202006-36268.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202007-38261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011202007-85765.png)
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