1 . 设
是数列
的前
项和,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4775854d3c2fd897b6799b14201e9e89.png)
(1)求
,并证明:
是等比数列;
(2)求满足
的所有正整数
.
![](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/4775854d3c2fd897b6799b14201e9e89.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf6a6abc3a6abef29b943543e92f7ee.png)
(2)求满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd756ad895dc5bf3dfd98622bc60eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
名校
解题方法
2 . 记
为等比数列
的前n项和,
.
(1)若
,求
的值;
(2)若
,求证:
.
![](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/9cc590bb39552470f9bbc82d21e6483a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf68506dcaa418f1145ae1879b04e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad912fb758f512a2fd0b189b0143dffb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96f1121646e96f995c6c6d29ebea90ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/695a7c8724237650996d231a1089ad27.png)
您最近一年使用:0次
2023-11-28更新
|
526次组卷
|
3卷引用:热点5-2 等比数列的通项及前n项和(6题型+满分技巧+限时检测)
(已下线)热点5-2 等比数列的通项及前n项和(6题型+满分技巧+限时检测)安徽省示范高中培优联盟2023-2024学年高三上学期秋季联赛数学试题宁夏回族自治区2023-2024学年高二上学期期末测试数学训练卷(二)(范围:选择性必修第一册 第三章+选择性必修第二册 第四章)
名校
3 . 已知数列
的各项均不为零,
为其前n项和,且
.
(1)证明:
;
(2)若
,数列
为等比数列,
,
.求数列
的前2022项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90cff82e2583cf9048c5e26dcfc1e611.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e35ba37b0cc1d390e05391554e9660.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7bdaaf8b0adf10bf2ef6c1255b1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c340fdadffa2f9120a70430ce477f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/731e60bc5b0bd0b66a3ebb2b73b5d2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/230ced692fde8e0912c8feffed5b30b6.png)
您最近一年使用:0次
2022-03-11更新
|
1634次组卷
|
6卷引用:专题18 数列求和-2022届高考数学一模试题分类汇编(新高考卷)
(已下线)专题18 数列求和-2022届高考数学一模试题分类汇编(新高考卷)(已下线)4.3.2.2 等比数列的前n项和的性质及应用(练习)-2022-2023学年高二数学同步精品课堂(人教A版2019选择性必修第二册)(已下线)第二篇 “搞定”解答题前3个 专题2 数列解答题【讲】 高三逆袭之路突破90分河北省唐山市2022届高三下学期第一次模拟数学试题福建省福州第二中学2021-2022学年高二下学期期末考试数学试题(已下线)4.3.2 等比数列的前n项和公式(2)
4 . 在数列
中,
,
,且
.
(1)证明:
是等比数列;
(2)求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d28dede19e2191106a3f990ad7e340.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec759aa0fa6c46f3cd1225cfc9c1d40e.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
您最近一年使用:0次
2022-03-11更新
|
1913次组卷
|
5卷引用:专题18 数列求和-2022届高考数学一模试题分类汇编(新高考卷)
(已下线)专题18 数列求和-2022届高考数学一模试题分类汇编(新高考卷)(已下线)专题25 等比数列及其前n项和-1(已下线)热点5-2 等比数列的通项及前n项和(6题型+满分技巧+限时检测)河北省高碑店市崇德实验中学2024届高三上学期9月月考数学试题新疆维吾尔自治区普通高考2022届高三第一次适应性检测数学(文)试题
解题方法
5 . 学习资料:有一正项数列
,若作商
,则当
时,
当
时,
.这是一种数列放缩的方法.现有一等差数列
的前
项和为
的前
项和为
.
(1)求
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0b7ea52a44b4e0396ec61618cde072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ba3395912bdf86436bde80a0cb64e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44de78fc8578ec226389611139eecc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbf748f2b8fe559ea8feafef68dd6b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0abe3b1a6a238043b3bdbb1327d41368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e5f5ec7a220ee558e9500a4782b078.png)
您最近一年使用:0次
解题方法
6 . 已知等差数列
的首项为
,公差为
,等比数列
的首项为
,公比为
,其中
,且
.
(1)求证:
,并由
推导
的值;
(2)若数列
共有
项,前
项的和为
,其后的
项的和为
,再其后的
项的和为
,求
的比值.
(3)若数列
的前
项,前
项、前
项的和分别为
,试用含字母
的式子来表示
(即
,且不含字母
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ea79e5b52c82c9b5bc188e150ecd8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543150ec61b3177fbb45b7e1d9800765.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663408ffd10ad082002513bd472118c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9b4d7a50cac0f712c6bb644f5e07e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f41be870e84c819362787849770519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9a672337c7a5d00e55581bb265aba0.png)
(3)若数列
![](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/e2d51f9147b8265c0276c1f2c2659197.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f41be870e84c819362787849770519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7cac25e2a2ca07a5b406de7d6c1752b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d307b3c4da63535e665ce0a17712eb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4001ae6c447850b139a0206d28e02516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
您最近一年使用:0次
2020-01-14更新
|
489次组卷
|
3卷引用:专题7 等比数列的性质 微点2 等比数列前n项和的性质
(已下线)专题7 等比数列的性质 微点2 等比数列前n项和的性质上海市北虹、上理工附中、同二、光明、六十、卢高、东昌等七校2016-2017学年高三上学期12月月考数学试题上海市七校2017届高三上学期12月联考数学试题
7 . 已知等比数列
的首项为
,公比为
,用符号
表示这个数列的第
项到第
项共
项的和.
(1)计算
,
,
,并证明它们仍成等比数列;
(2)将第(1)题中的结论推广到一般,并予以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bbca32ee5e88a8e7163769c27836722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5274d85d8262f933ed9ca30fa394c3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a7abe0bcbc3e96d27797b72d1c27c0.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18694e7ea2628af18193c967e6a84124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2688f2febc85aa1e57e7c77c8a50ab99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eebbf421a4c304ca5c339e9290d788.png)
(2)将第(1)题中的结论推广到一般,并予以证明.
您最近一年使用:0次