在数列
中,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d238a52feae87b0778ba324dc144d50.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1928c254cfada1f75a5cd1e34db5a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205db8a0d89daee80053358cc5563b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d238a52feae87b0778ba324dc144d50.png)
更新时间:2020-07-11 16:53:34
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【知识点】 数列求和的其他方法
相似题推荐
填空题-单空题
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较易
(0.85)
【推荐1】数列
中,
,
,
,则
的前2015项和
=_______ .
![](https://img.xkw.com/dksih/QBM/2015/12/7/1572344066768896/1572344072495104/STEM/095dc1d5129343f08e3ab335a022627b.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2015/12/7/1572344066768896/1572344072495104/STEM/cf6505654fd54fc3a27d4fb83a55420c.png?resizew=40)
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![](https://img.xkw.com/dksih/QBM/2015/12/7/1572344066768896/1572344072495104/STEM/39a7a2a0e8bc47a7bf809339520555df.png?resizew=103)
![](https://img.xkw.com/dksih/QBM/2015/12/7/1572344066768896/1572344072495104/STEM/095dc1d5129343f08e3ab335a022627b.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2015/12/7/1572344066768896/1572344072495104/STEM/b20161fe54404637b2842cff267e4392.png?resizew=33)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐2】在数列
中,
,
等于
除以3的余数,则
的前89项的和等于________ .
![](https://img.xkw.com/dksih/QBM/2013/9/7/1571344359538688/1571344365125632/STEM/9fb758b57ec24bee965ced56256de6b6.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2013/9/7/1571344359538688/1571344365125632/STEM/66cdfc36a37041658e49348a6bdbc388.png?resizew=85)
![](https://img.xkw.com/dksih/QBM/2013/9/7/1571344359538688/1571344365125632/STEM/9a242bff9b85431696817ec57d29dc17.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2013/9/7/1571344359538688/1571344365125632/STEM/72c2e69132ce4018b60544ca5ea81f4b.png?resizew=57)
![](https://img.xkw.com/dksih/QBM/2013/9/7/1571344359538688/1571344365125632/STEM/9fb758b57ec24bee965ced56256de6b6.png?resizew=32)
您最近一年使用:0次