题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144305-54062.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144305-82625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144306-43680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144306-83926.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144306-61720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144306-37925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144307-44950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144307-71989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144307-92713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144307-46983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144307-16248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144307-92007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144306-37925.png)
记
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144308-90232.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144308-53170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144308-78474.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144308-73091.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144306-37925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144309-13938.png)
(3)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144309-47623.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144309-66960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144309-62434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144309-84002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144310-33836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144310-47003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144308-78474.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144310-48679.png)
所以由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144310-34409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144311-10554.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144311-77950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144309-13938.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144311-77410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144312-18352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144312-53012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144312-45547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144312-62415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144313-35638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144313-79227.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144313-46341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144313-87358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144314-17153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144314-81292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144314-59348.png)
解析
核心考点
试题【(本题18 分)已知数列:、、且(),与数列:、、、且().记.(1)若,求的值;(2)求的值,并求证当时,;(3)已知,且存在正整数,使得在,,,中有4项为1】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
A.d<0 | B.a7=0 |
C.S9>S5 | D.S6与S7均为Sn的最大值 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144217-71806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144217-76230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144217-50043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144217-71806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144218-59871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144218-85392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144218-46351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144156-83306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144157-29493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144157-35160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144157-13610.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144157-41740.png)
A.50 | B.45 | C.40 | D.35 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144116-10338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144117-62877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144117-60106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144117-32241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144118-95639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144118-71619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144118-54338.png)
(Ⅰ)写出数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144116-10338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144118-95639.png)
(Ⅱ)记
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144118-21893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144119-69220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144108-67493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144108-45111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012144108-66418.png)
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