若数列
的前n项和为
,对任意正整数n都有
,记
,则数列
的前50项的和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292a7a05cf44726463145705fc0f5d9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644a4e7cd7460a0d96ccae5b192e684a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da72309d2507e2f5e5ed88d8cc08963.png)
更新时间:2020-07-21 09:51:47
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相似题推荐
填空题-单空题
|
适中
(0.65)
解题方法
【推荐1】已知数列
的前
项和为
,且满足
,若数列
满足
,则使数列
的前
项和取最大值时的
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8370a173854471a3eb27637993a3d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1b150f19441371f32728a4f1ddeb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
填空题-单空题
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适中
(0.65)
名校
【推荐1】若
的展开式中
的系数为
,则
=____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b5380508bb02b42ae8751cd8154b32.png)
![](https://img.xkw.com/dksih/QBM/2014/4/30/1571698515689472/1571698521292800/STEM/86f3937945814880a423ed12adaa5e94.png?resizew=27)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9bac86d6648ceed286272ffdb04287.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐2】已知数列
的前
项和为
,且
,则数列
的前100项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f3d1b22d630bc1a295b94e8f94d2f3.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8370a173854471a3eb27637993a3d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdcb4751161b827640fab956df55831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f3d1b22d630bc1a295b94e8f94d2f3.png)
您最近一年使用:0次