1 . 已知各项均为正数的数列
满足:
,且
,
.
(1)求证:数列
为等比数列;
(2)设
,
,求
.
![](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/65fd1d2152a94a0e7a3be3df37e11978.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a40142c84be68ee2918c3a8303388c.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8715175f2827d5ee4ba50bfeeddc2c15.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b20ef1fd7f3fda12cbf57003d0e0f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c7719eda546eb96b63f87bef808d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d30d6eecf80cb8a09ed2e585a94ea9.png)
您最近一年使用:0次
2 . 已知数列
的前
项和为
,在①
,②
这两个条件中任选一个,并作答.
(1)求数列
的通项公式;
(2)设
,
为数列
的前
项和.证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66861fad4a49ff6eaedfe4828dbe455e.png)
(注:如果选择多个条件分别解答,按第一个解答计分.)
![](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/9610a946846067376e97a31367da9949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b74df7b8a0bb24399922331dbbed43d.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8497f33b535453cf984bc3526f0a204.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bde034b0bb6767f923526db8a387c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66861fad4a49ff6eaedfe4828dbe455e.png)
(注:如果选择多个条件分别解答,按第一个解答计分.)
您最近一年使用:0次
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解题方法
3 . 已知数列
的前n项和
,且
.
(1)求数列
的通项公式;
(2)令
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d95f3610974e4f7762d60158a28742.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba65d7d9b9355d3673b05312ca514429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2021-03-27更新
|
138次组卷
|
2卷引用:江西省鹰潭市第一中学2021届高三上学期第三次月考数学(文)试题
2020高三·全国·专题练习
名校
4 . 已知数列{an}满足a1=1,nan+1=2(n+1)an.设bn=
.
(1)求b1,b2,b3的值;
(2)判断数列{bn}是否为等比数列,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77288bfa684c2a9ca00c75743232a0e3.png)
(1)求b1,b2,b3的值;
(2)判断数列{bn}是否为等比数列,并说明理由.
您最近一年使用:0次
名校
5 . 设等差数列
的前
项和为
,
,
,若
,且
,数列
的前
项和为
,且满足
(
).
(Ⅰ)求数列
的通项公式及数列
的前
项和
;
(Ⅱ)是否存在非零实数
,使得数列
为等比数列?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/4f5e4f609ee018438416a9c6ca53c03f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40eab857d61f91baa2c7ac30736c9fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc6c73ea435f47aaadb9787236975e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd6977b9be2212e76cecccdc1c129321.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0d9323f327306b0bb596e98ca41cf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbe113b7c2cc1b464e86bdfa3a6fe2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
(Ⅱ)是否存在非零实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
您最近一年使用:0次
2017-02-08更新
|
728次组卷
|
3卷引用:2017届江西鹰潭一中高三文上学期月考五数学试卷
6 . 设数列
的前
项和为
,已知
,
(
).
(1)证明:数列
是等比数列;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/34c92b643c2ade3beaae41d47a62baf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0336731988224293bc0e9a7958adfd.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0519af3f19dde038fab2e68b5e2a5387.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
2016-12-04更新
|
2908次组卷
|
7卷引用:2017届江西鹰潭一中高三文上学期月考五数学试卷
2017届江西鹰潭一中高三文上学期月考五数学试卷2017届江西鹰潭一中高三理上学期月考五数学试卷2016届湖北省武汉市武昌区高三5月调研考试理科数学试卷辽宁省庄河市高级中学2017-2018学年高二上学期期中考试理数试题(已下线)2018年12月30日 《每日一题》(理数)人教必修5+选修2-1(高二上期末复习)-每周一测(已下线)4.2求数列的通项公式与前n项的和[理]-《备战2020年高考精选考点专项突破题集》(已下线)4.2求数列的通项公式与前n项的和[文] -《备战2020年高考精选考点专项突破题集》