1 . 记数列
的前
项和为
,若
,且
.
(1)求证:数列
为等比数列;
(2)求数列
的前
项和
的表达式.
![](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/38b95f8ca4c362fc4a2c40fd5a2ac0f2.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20665f117ffccd6ad4241e8cd6f90a99.png)
(2)求数列
![](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)
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2 . 已知数列
的前
项和为
,
,且
.
(1)证明:数列
为等差数列;
(2)选取数列
的第![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31971306914638e5ceb1bbe437535d3.png)
项构造一个新的数列
,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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a7b9451f1e903cdf0a71e38a8020d2.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7daf61f4e47de374185652d6e0524938.png)
(2)选取数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31971306914638e5ceb1bbe437535d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2889dd3096379db5dfdd51305bdbb743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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)
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2022-11-14更新
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395次组卷
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2卷引用:宁夏银川一中2023届高三上学期第三次月考数学(文)试题
3 . 数列
前
项和为
,满足:
,
.
(1)求证:数列
是等比数列;
(2)求和:
.
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c8251ae667250fb36ce4c0d75228317.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f86e5aaea193d51fa06c58abb3898b.png)
(2)求和:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549ae3df9e7033cdc203b8d9ddb0e36a.png)
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2020-12-14更新
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7卷引用:宁夏银川一中2023届高三下学期第五次月考数学(文)试题
4 . 已知数列
满足:
,且
,
,
成等差数列;
(1)证明:数列
为等比数列,并求数列
的通项公式;
(2)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2de706dc5f0439b989273a5367f63a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a30d759211e7f051fcf476ca07fa19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2020-09-05更新
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2卷引用:宁夏石嘴山市第三中学2021届高三上学期第一次月考数学(理)试题
名校
5 . 已知数列
满足
.
(1)证明数列
是等差数列,并求出数列
的通项公式;
(2)设
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085196c87bb13536f8879caca2d4aea2.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1705cd1b7eb5de318f6f140bbefaa16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f4c3f8f530a7ced8be3447fff104156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
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2019-12-04更新
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2卷引用:宁夏回族自治区银川市宁一中2019-2020学年高三12月月考数学(理)试题
名校
6 . 已知数列
,
是其前
项的和,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77a5f7bf74e9434a2af6e7f29740afe.png)
(1)求证:数列
为等比数列;
(2)记
,求
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77a5f7bf74e9434a2af6e7f29740afe.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/188fe9777770dfd23a6abb456fa2358d.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf61e36e27a38b988dd93b34a2fbc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
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2019-01-25更新
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11卷引用:2017届宁夏石嘴山三中高三上学期月考一数学(理)试卷
2017届宁夏石嘴山三中高三上学期月考一数学(理)试卷河北省沧州市第一中学2016-2017学年高一下学期第二次月考数学试题上海市松江二中2024届高三上学期阶段测试1数学试题山东省淄博第五中学2022-2023学年高二下学期3月月考数学试题上海市嘉定区第一中学2024届高三上学期10月月考数学试题2015届浙江省杭州地区7校高三上学期期末模拟联考理科数学试卷河南省濮阳市2017-2018学年高二上学期期末考试(A卷)数学(理)试题湖南省醴陵市第一中学2018-2019学年高二上学期期末考试数学(文)试题湖南省长沙市岳麓区湖南师范大学附属中学2018-2019学年高二下学期期末数学试题(已下线)上海市华东师范大学第二附属中学2023届高三冲刺模拟4数学试题上海市曹杨第二中学2023届高三模拟数学试题
名校
7 . 已知数列
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/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f3d874602b2d1cc4e9dab6c7bdcf83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c59ea90aee2231b635544ed0d27345.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02235497a3d9e37561766c223f6dd048.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
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14卷引用:宁夏大学附属中学2018届高三上学期第三次月考数学(理)试题
宁夏大学附属中学2018届高三上学期第三次月考数学(理)试题四川省雅安中学2018届高三上学期第一次月考(文)数学试题陕西省商洛市洛南中学2020-2021学年高二上学期第一次月考数学试题广西田东县田东中学2020-2021学年高二9月月考数学试题陕西省渭南市杜桥中学2020-2021学年高二上学期第一次月考文科数学试题陕西省渭南市杜桥中学2020-2021学年高二上学期第一次月考理科数学试题陕西省延安北大培文学校2022-2023学年高二上学期第一次月考理科数学试题2017届四川成都市高三理一诊考试数学试卷陕西省西安市第一中学2017-2018学年高二上学期期中考试数学(文)试题安徽省合肥市第十一中学2018-2019学年高一下学期期末数学试题河南省南阳市2019-2020学年高二上学期期末数学(文)试题陕西省商洛市商丹高新学校2020届高三下学期考前适应性训练文科数学试题(已下线)第六单元 数列(B卷 滚动提升检测)-2021年高考数学(文)一轮复习单元滚动双测卷黑龙江省哈尔滨市第三十二中学2020-2021学年高三上学期期末考试理科数学试题
9-10高三·宁夏银川·阶段练习
解题方法
8 . 在各项均为负数的数列
中,已知点
(
)在函数
的图像上,且
.
(Ⅰ)求证:数列
是等比数列,并求出其通项;
(Ⅱ)若数列
的前n项和为
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2aeba7035c6ac1c4aeb153f605be79b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb80cfa75e2b67078680ab6b1aa3e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f1186e7d66f20bb1d551e2ecef7b88.png)
(Ⅰ)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(Ⅱ)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1179414a71459a3cfa134ace94302e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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