题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071320-34783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071320-76258.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071321-38090.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071321-36842.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071321-65175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071321-39559.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071322-15259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071320-34783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071322-95947.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071322-31917.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071322-97644.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071321-36842.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071322-88587.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071323-63510.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071322-31917.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071323-17041.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071323-83433.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071323-68319.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071324-86798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071324-84783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071324-71290.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071324-95001.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071325-60361.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071325-97711.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071325-13482.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071325-94122.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071320-34783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071325-44274.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071326-32481.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071326-85033.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071321-39559.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071322-15259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071326-67372.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071326-32481.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071326-37341.gif)
(2)①证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071327-67992.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071327-32527.gif)
∴数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071327-29900.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071327-92776.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071327-98785.gif)
②由题意,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071328-57991.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071328-29618.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071328-63961.gif)
相减得
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071328-87550.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071329-34878.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071329-59908.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071329-19467.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071329-32523.gif)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071325-97711.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071329-48496.gif)
核心考点
试题【(本小题满分14分)已知递增数列满足:, ,且、、成等比数列。(I)求数列的通项公式;(II)若数列满足: ,且。①证明数列是等比数列,并求数列的通项公式;②设】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071308-91564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071308-62788.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071309-64753.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071309-54708.gif)
A.7 | B.6 | C.3 | D.2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071241-48487.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071241-46113.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071242-13219.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071242-87861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071242-12379.gif)
A7 B. 6 C. 5 D. 4
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071234-57987.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071234-50118.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071235-48978.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071235-68838.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071235-93339.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
等差数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071224-31270.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071224-97542.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071224-31270.gif)
(Ⅱ)若Sn=242,求n.
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