题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153241-74205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153241-24518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-77560.png)
(I) 求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153241-74205.png)
(II)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-18729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-68428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-62877.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-15745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-43937.png)
解析
试题分析:(I)设公差为d(d
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-33843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-75369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-62802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-13276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153244-46118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153244-55935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153244-58579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-68428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-62877.png)
试题解析:(1)设公差为d(d
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-33843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-75369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-62802.png)
又因为
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153243-13276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153244-46118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153245-84635.png)
(2)由(1)得
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153244-55935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153244-58579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153245-65595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153245-17195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009153242-43937.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152611-13738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152611-77791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152611-21651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152612-42475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152612-88066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152612-92463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152612-47289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152612-17137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152613-49943.png)
A.8 | B.9 | C.10 | D.11 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152344-72478.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152344-75256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152344-20907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152344-57900.png)
A.2 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152110-98522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152110-11855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152110-98522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152111-96104.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152034-20666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152035-96036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152035-67920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152035-49322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152036-74175.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152034-20666.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152036-13875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152036-99690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152036-50247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152036-17428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009152037-22548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151842-27581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151842-63599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009151843-96246.png)
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