1 . 已知等比数列
的前
项和
,则
的值为( )
![](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/b54a97f4a730e1630cb0eafd6430c38b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 已知数列
的前n项和分别为
,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4afc0af2902e226cd3cb15a4b3343c01.png)
(1)求数列
的通项公式
(2)求
的通项公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478421b81927e435cbcf5acafa89efd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8370a173854471a3eb27637993a3d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4afc0af2902e226cd3cb15a4b3343c01.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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解题方法
3 . 已知等比数列
的前
项和是
,且
.
(1)求
的值及数列
的通项公式;
(2)令
,数列
的前
项和
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd7e8930d9758648fa2346c26ffbad5.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0d88f773d6b284547164153add6af08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db571e4abf2e608f5531649ff2217e7.png)
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名校
解题方法
4 . 已知数列
的前
项和为
,
,
.
(1)证明:数列
是等比数列;
(2)若
,求证数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483ce6c09bb93afb8a5b124e6ed35e44.png)
.
![](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/5b03dd47b0469396a7a7aeae1c31eb5c.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/583611a0934587f9f6029590c6d8071b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db850e54a545598c4ea061aa6aed9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483ce6c09bb93afb8a5b124e6ed35e44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af46237d7279ffb682d57e4e7b57a2b.png)
您最近一年使用:0次
2023-08-24更新
|
586次组卷
|
2卷引用:黑龙江省哈尔滨市尚志市尚志中学2022-2023学年高二上学期12月月考数学试题
解题方法
5 . 已知在数列
中,
,前
项和为
,且
.
(1)求数列
的通项公式;
(2)若
,令
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.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/c7a8249019763014bf365b933e0da3cc.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35bea1fea36b973396918f4a3329675b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac07953530e3c248b3438fb200fb1661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.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
6 . 已知数列
的前n项和为
,从条件①、条件②这两个条件中选择一个条件作为已知,解答下列问题.
(1)求数列
的通项公式;
(2)设
,记
的前n项和为
,若对任意正整数n,都有
,求实数
的取值范围.
条件①
,且
;条件②
为等比数列,且满足
;
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/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43223fcd544c27a888fe29e768e851b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e569bec99bea2fe11eaaf5e4117d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
条件①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c947649f39a369d042ea427c8cc479e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000674a1eefac8121ba1fe3946ca2a90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6863bce85116941295cddc8bfaa9b5d.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
2023-02-26更新
|
600次组卷
|
3卷引用:福建省福州第一中学2022-2023学年高二上学期期末数学试题
名校
解题方法
7 . 已知数列
的前
项和
满足
.
(1)求
,并证明数列
为等比数列;
(2)若
,求数列
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/079d7b4f5061c163c85d1ebf9ffb6dea.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a1cbdba005d5a2041870d638f5b4c2d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f9e482f73365d9310b40af0bc91bb5a.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2022-11-25更新
|
1137次组卷
|
4卷引用:2023年高考数学(文)终极押题卷
(已下线)2023年高考数学(文)终极押题卷黑龙江省哈尔滨市尚志市尚志中学2023届高三上学期12月月考数学试题四川省宜宾市2023届高三上学期第一次诊断性数学(文)数学试题(已下线)专题6-3 数列求和-3
8 . 已知数列
的前n项和
满足
.
(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/a742ea39d5f4c69ecb789537648bcb4b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd564533461eacaa762c5ace305cd6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a6c852d593cb9f6bdfd9eeddb50fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2022-11-10更新
|
1626次组卷
|
9卷引用:新疆伊犁州奎屯市第一高级中学2023届高三上学期12月月考理科数学试题
新疆伊犁州奎屯市第一高级中学2023届高三上学期12月月考理科数学试题浙江省宁波市2023届高三上学期一模数学试题(已下线)数学(甲卷理科)(已下线)数学(甲卷文科)江苏省盐城市响水县清源高级中学2022-2023学年高二上学期期末数学试题(已下线)4.3 等比数列(3)(已下线)专题05 等比数列与数列综合求和-2023-2024学年高二数学期末复习重难培优与单元检测(人教A版2019)(已下线)4.3等比数列(3)河北省石家庄一中2023-2024学年高二上学期期末数学试题
名校
解题方法
9 . 设等比数列
的前
项和为
,
,若不等式
对任意的
恒成立,则
的最小值为( )
![](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/2318924bb3db61475f4fd4d96fbb445e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb723d2d21ddd79fcb925fcfa401acc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15da7cceea2f0fbf5c311e05ccd76c19.png)
A.1 | B.![]() | C.2 | D.![]() |
您最近一年使用:0次
22-23高二·全国·课后作业
解题方法
10 . 已知数列
的前n项和
,证明
是等比数列,并求出通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b8e34cdd334b668fe8ca80e133833b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
您最近一年使用:0次