已知数列
满足
,
,现将该数列按下图规律排成蛇形数阵(第i行有i个数,
),从左至右第i行第j个数记为
(i,
且
),则
=___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15cb3771055d9d82627d47b7ce91afdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f1373f0a8753574639ca51553b8e8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee641d39bc70aa40e611fcfc6b78f30b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07eeb1c770bde4ee79af5abfd298dbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef8f8e81802e4d3b9a2ebf3ff244143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ef5dad71f2a8c38b22f04876cb1d3c.png)
![](https://img.xkw.com/dksih/QBM/2021/4/27/2708879743729664/2798103249412096/STEM/e9501bf9005c4b11b75af808dcd64ca1.png?resizew=166)
20-21高二下·安徽芜湖·期中 查看更多[2]
更新时间:2021-08-31 16:58:32
|
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填空题-单空题
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容易
(0.94)
解题方法
【推荐1】有一串有规律的数字:
,则这串数字的第100个数字是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cd81c3956ac64e3b95fa938ac512071.png)
您最近一年使用:0次
填空题-单空题
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容易
(0.94)
名校
解题方法
【推荐2】已知数列
的前
项和为
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e793c7fed145683cd021d1110be5ee.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/e6f18f2c2ec67b5e59e4b3d28795d125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6f36ef5c8d4a8289da44d6c03bc9c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e793c7fed145683cd021d1110be5ee.png)
您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
解题方法
【推荐1】在等差数列
中,
,
,则
的前5项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0d29f34218cd60cc6e9ce4dcd13925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614306cc3f34bdee4d5d885b79667645.png)
您最近一年使用:0次