1 . 已知数列{an}满足a1=1,an>0,Sn是数列{an}的前n项和,对任意的
n∈N*,有2Sn=2an2+an-1.
(1)求数列{an}的通项公式;
(2)记
,求数列{bn}的前n项和Tn.
n∈N*,有2Sn=2an2+an-1.
(1)求数列{an}的通项公式;
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7d3d55a85012933f91c5d8d27d8801d.png)
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13-14高二上·辽宁丹东·期末
2 . 数列
的前
项和为
,若
,点
在直线
上.
⑴求证:数列
是等差数列;
⑵若数列
满足
,求数列
的前
项和
;
⑶设
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.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/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae89ee7d3854b42892d0f973c26f340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b5eb45ebb283efa86afac997de2fbc4.png)
⑴求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0336731988224293bc0e9a7958adfd.png)
⑵若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65e6d7591c7f462e5962e44a10d4ff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89d1f32c1605cfdb8e8855051b9f6ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
⑶设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945af8434fd20a93dd1e021f7096a331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad56b355c0fa155981ec3959552e5b3.png)
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12-13高三上·内蒙古包头·期末
3 . 已知正项数列{an},其前n项和Sn满足10Sn=an2+5an+6且a1,a3,a15成等比数列,求数列{an}的通项an
![](https://img.xkw.com/dksih/QBM/2012/2/8/1570722787983360/1570722793357312/STEM/588e2b2eb7b7455b8ff1bbd369af7efa.png)
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10-11高二上·广东东莞·期中
4 . 已知{
}是公差不为零的等差数列,
=1,且
,
,
成等比数列.
(Ⅰ)求数列{
}的通项; (Ⅱ)求数列{
.
}的前
项和
.
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/1472d8fe8a4a45ff91bd382d355b84b1.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/fbc65e2dcf6f4d049792bda1ad326a9d.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/fbc65e2dcf6f4d049792bda1ad326a9d.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/5ef29936109043f18284d04221f3eced.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/2b93385f8fae45a8aa42540a9b88b6bb.png)
(Ⅰ)求数列{
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/1472d8fe8a4a45ff91bd382d355b84b1.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/1472d8fe8a4a45ff91bd382d355b84b1.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/12f65aa75ed246d7a54e05e4fce87809.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/385a66466ad447b9a03632e59b2cd2b9.png)
![](https://img.xkw.com/dksih/QBM/2012/2/24/1570770461794304/1570770467282944/STEM/0c47a7aaf4ac455dbb02966bbfbffa79.png)
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