已知数列
,其通项公式为
,求其前
项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd0a6a0494008a752130879e3cd0dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
更新时间:2023-09-24 23:51:02
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【知识点】 数列求和的其他方法
相似题推荐
【推荐1】在数列
中,若
,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4139f450eede11d86247de12a5b431b.png)
则称
为“
数列”.设
为“
数列”,记
的前
项和为
.
(1)若
,求
,
,
的值;
(2)若
,求
的值;
(3)证明:
中总有一项为1或3.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d908582b5cb7fe6ac42e30b01fcc0d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed524e5e90b9bcc989a5ddd1f017285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4139f450eede11d86247de12a5b431b.png)
则称
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67716ac738ee2911a69bf4063110a5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67716ac738ee2911a69bf4063110a5bd.png)
![](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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b71ef6cb9c5d494692d40a9ef279f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a48e81b54f78b96294295542b010dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05201ef79a5d5904f492845396fb5470.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c2001d33adb177aef4725934cd9591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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解答题-问答题
|
较易
(0.85)
【推荐2】已知数列{an}满足a1=1,an+1=an+
(c>0,n∈N*),
(Ⅰ)证明:an+1>an≥1;
(Ⅱ)若对任意n∈N*,都有
,证明:(ⅰ)对于任意m∈N*,当n≥m时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35409bd745d23ac8ca1cc0eb6efb1064.png)
(ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21aaee3f6980956acfe51f025fd27f2a.png)
(Ⅰ)证明:an+1>an≥1;
(Ⅱ)若对任意n∈N*,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff4a5924d64107664a35ac38948f189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35409bd745d23ac8ca1cc0eb6efb1064.png)
(ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493754937e4906959ff0fac1efeaa0a8.png)
您最近一年使用:0次