数列
满足
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c439950003919673f5cb5901697f52ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac326f9f4ad78d0053c113f823ea6d60.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-01-07 08:30:33
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【推荐1】已知数列{an}满足a1=
,an+1=
,(n∈N*),则a2020=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ddf2ae04265e2cbf674ab40bba45c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e48f5cd8326bfa11e07dc413617540f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】如图所示的形状出现在南宋数学家杨辉所著的《详解九章算术·商功》中,后人称为“三角垛”.“三角垛”的最上层有1个球,第二层有3个球,第三层有6个球,….右图所示的程序框图给出了计算“三角垛”小球总数的一个算法,执行该程序框图,输出的S即为小球总数,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/dc4a7a3e-cb6a-42b5-93f5-b593d3a3b22a.png?resizew=282)
A.35 | B.56 | C.84 | D.120 |
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【推荐1】设
,若
,则数列
是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65b6c42393fae47c51101713167ff71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b606185ef50c9fd1aa4d1dea26a3e439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086e9b14c35ef3c57b20f5e952ebf9c8.png)
A.递增数列 | B.递减数列 |
C.奇数项递增,偶数项递减的数列 | D.偶数项递增,奇数项递减的数列 |
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【推荐1】设数列
满足
,记数列
的前
项之积为
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( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9163396996a2a774b7d705fd97c4170.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/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c36b7a6ef5a33009d47fcaf9a7ac0a3.png)
A.![]() | B.![]() | C.1 | D.![]() |
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