设Sn为数列{an}的前n项和,已知
,对任意n∈N*,都有2Sn=(n+1)an.
(1)求数列{an}的通项公式;
(2)若数列
的前项和为Tn,求Tn的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
(1)求数列{an}的通项公式;
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0de91eecfef80f48096291bb36dbe26.png)
更新时间:2019-06-23 22:47:56
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】数列
的前
项和为
,已知首项
,且
.
(1)求数列
的通项公式;
(2)对于数列
,若存在常数
,对任意的
,恒有
,则称数列
为
数列,请判断数列
是否为
数列,并说明理由.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36fbdcbac25bcf430ece39ef7a7c425b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)对于数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1787e31a63a7f2ffe501f233a186ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f93c78e3b6ab0daa88d8306b2b2058b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f93c78e3b6ab0daa88d8306b2b2058b.png)
您最近一年使用:0次
【推荐2】已知数列
的前
项和为
,且
.
(1)证明
是等比数列;
(2)求
的前
项和
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78db82eecc943aa834f6ff92f7b19cc.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c033d0d59a0767eea50d0afa4737e4.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0496f142d8ae5acb06e83526eaa3ef87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】已知数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cfcf2148eb3d4544ff0c9e7e2b679b.png)
(1)证明:数列
为等差数列:
(2)设数列
满足
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cfcf2148eb3d4544ff0c9e7e2b679b.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b676976524797205f5e4c99bee51a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐2】设数列
是公比为正整数的等比数列,满足
,
.设数列
满足
,
.
(1)求
的通项公式;
(2)求证:数列
是等差数列,并求
的通项公式;
(3)记
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec819be226332a0474ab1073db189d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2468599a0fa90d1fc46219ae3ecac482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0936ddc154297c06d5bcdb5c156db68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf21abc0659148c019c5ebbcf56d84f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102abb18c888eb23d40708b97de140ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5beadf67f8c6c4e54a873b5c7edfcae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c387117ab783511f53e793cd2048239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8bdbfb839cc9dbdc2166a9937059aa1.png)
您最近一年使用:0次