题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203125-89034.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203125-75649.png)
解析
试题分析:等式的左边是以1为首项,
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203125-47722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203125-82058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203126-42381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203125-75649.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203040-17088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203040-84021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203040-56033.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203040-17088.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203040-61474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203041-97638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203041-29541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203010-99019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203010-34509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203011-11403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203010-99019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203011-60458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203011-79290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203012-75857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203012-31732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203012-69740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011203012-31913.png)
![](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 |
![](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)
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