数列
中,已知
,
,
,则数列
的前6项和为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0876b7e2271371d8a7ea0e77a833a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0578e8a21d22742c35bd1c32f7d06f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316b5d6779890069e877f081d1833883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
19-20高二下·云南昆明·期末 查看更多[2]
云南省昆明市2019-2020学年高二下学期期末质量检测数学(文)试题(已下线)专题5.1 数列基础(A卷基础篇)-2020-2021学年高二数学选择性必修第三册同步单元AB卷(新教材人教B版)
更新时间:2020-09-04 11:42:53
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【知识点】 根据数列递推公式写出数列的项
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【推荐1】已知数列{an}满足a1=1,且an+1=2an+1(n∈N*),则a5=______ .
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【推荐2】已知函数
的对应关系如下表所示,数列
满足
,
,
则
=_______ ,
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6aa8089b5d9b722aff679af3c4d289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea00d10c496ccacb5b25c9574d6cdb09.png)
x | 1 | 2 | 3 |
f(x) | 3 | 2 | 1 |
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