名校
解题方法
1 . 设
为数列
的前
项和,已知
,
.若数列
满足
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f13851bcbbcaacbf03b62e88757e0b9.png)
.
(1)求数列
和
的通项公式;
(2)设
,求数列
的前
项的和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7404f62054146fe88b820ab26e8f8f89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eab7d59ce066c8f0b346719003f8e28f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f13851bcbbcaacbf03b62e88757e0b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d82e4c2294efbd33e1b268e9a0cec5.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabedb4b5256bead20be8a6b491cdb49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
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2022-04-17更新
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1350次组卷
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6卷引用:重庆市2022届高三学业质量调研抽测(第二次)数学试题
重庆市2022届高三学业质量调研抽测(第二次)数学试题(已下线)2022年高考考前20天终极冲刺攻略(三)【数学】(新高考地区专用)(5月31日)(已下线)4.4 求和方法(精讲)-【一隅三反】2023年高考数学一轮复习(基础版)(新高考地区专用)(已下线)考点14 等差数列与等比数列(核心考点讲与练)-2023年高考数学一轮复习核心考点讲与练(新高考专用)(已下线)第08讲 等差、等比数列- 1内蒙古自治区赤峰二中国际实验学校2023届高三上学期12月月考理科数学试题
解题方法
2 . 已知各项均为正数的等差数列
的前三项和为12,等比数列
的前三项和为
,且
,
.
(1)求
和
的通项公式;
(2)设
,其中
,求数列
的前20项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82fb5ba0c997563002ee3c9d00e97f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89fe0f4e8a80a2840c0f6929a8a6351b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/769fe52ac96348d3b12d23d06d702595.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42aa7963c57031e17427a72f5a12641b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
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2022-04-12更新
|
808次组卷
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3卷引用:重庆市2022届高三第二次联合诊断检测数学试题
重庆市2022届高三第二次联合诊断检测数学试题(已下线)2022年高考考前20天终极冲刺攻略(三)【数学】(新高考地区专用) (5月30日)江西省宜春市丰城市东煌学校2023-2024学年高二下学期3月月考数学试题
3 . 已知数列
的首项
,且满足
.
(1)证明:
是等比数列;
(2)求数列
的前n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/55ec04d3e591aefb3e110fa1b307aa87.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e1c06829bf8a351bf0d2d29d2889f1.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2022-02-26更新
|
4327次组卷
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9卷引用:重庆市第八中学2022届高三下学期调研检测(四)数学试题
4 . 已知等比数列
的前
项和为
,且
.
(1)求
;
(2)定义
为取整数
的个位数,如
,求
的值 .
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b981758450e9dcee6cfbe6c67c61f8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)定义
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1939710991647ab22cb5dff165b0c738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e812b69c7dc1bf485eed487a1cafe015.png)
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2021-06-03更新
|
710次组卷
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3卷引用:重庆市长寿中学校2021届高三下学期5月考前模拟数学试题
5 . 已知数列
为等比数列,且
,
.
(1)求数列
的通项公式;
(2)设
,
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8e8f821111de8075e5c3dfb22a5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313de3568d10ccd623fde02536d43eb1.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b7aff456ecc6794dc3a93f6b862fa29.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 . 已知等差数列
的公差
,
,且
成等比数列.
(1)求通项公式
;
(2)令
,
,求数列
的前
项的和
.
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/5a4ab73ee1e043ebb481daf0963b2370.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/f417746ad0c144ea86f3f0fcc031f9cf.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/722049af90c44afdab06c6e97be19066.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/aaaaf24cc0b545a981ba76b91099b37e.png)
(1)求通项公式
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/7bd906d5d063493d8657b5d0dda4f324.png)
(2)令
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/688f9725fa2c4f1ab793a2d809f065dc.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/8490d9331f8c4648852ef03a40b4a359.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/b58c0531f1404edb9eda1891583d98c6.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/9024539e83bc4ed29201dd15ab21e72f.png)
![](https://img.xkw.com/dksih/QBM/2015/3/12/1572005545041920/1572005550637056/STEM/11280258586240b0aedb5c9bde1feb98.png)
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