名校
解题方法
1 . 已知等差数列
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c0cf480490ee96ecddc74ef0c182d9.png)
(1)求数列
的通项公式;
(2)若将数列
的项重新组合,得到新数列
,具体方法如下:
,
,
,
,
,依此类推,第
项
由相应的
中
项的和组成.
(i)求数列
的通项公式;
(ii)求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f419b37a8000307c448986e294591c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2798e1dcab1f7f0fe3b8a94b3cd6a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ba3ab5da2ce99f0b7380c13157a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c0cf480490ee96ecddc74ef0c182d9.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若将数列
![](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/3aaee408bdec05bbdfcd4b841a331e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4835113e51ced39acb5dc41fcb8eabcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28dffc06e1434756b05ca5dbfe12e867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1252958abd7a62018a7e4de438078029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f1ad18371ec533aeac27cf1fad95c1.png)
(i)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(ii)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70e2b696888834b0fee59a9d466ead46.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
名校
2 . 已知数列
的前
项和为
,满足
,且
.
(1)求数列
的通项公式;
(2)记
,求数列
的前
项和为
.
![](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/c1848f5d54d3c30ea02c7f559b4d3718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce75634a3d0945816e685ffb23d30a7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8f968fcf6e8e2049ce0ec3b04e4322.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
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|
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6卷引用:宁夏中卫市2021届高三三模数学(文)试题
宁夏中卫市2021届高三三模数学(文)试题黑龙江省实验中学2021届高三下学期四模数学(文)试题湖北省襄阳市第五中学2021-2022学年高三上学期10月阶段性考试数学试题内蒙古包头市第四中学2021-2022学年高三上学期期中考试数学(文)试题(已下线)6.4 求和方法(精讲)-【一隅三反】2022年高考数学一轮复习(新高考地区专用)黑龙江省实验中学2021-2022学年高三上学期第六次月考数学(文)试题
3 . 已知
为数列
的前
项和,满足
,
.再从条件①②③中选择一个作为已知条件,完成下列问题:
(1)求
的通项公式;
(2)求数列
的前
项和.
条件①
;②
(
为常数);③
.
注:如果选择多个问题分别解答,按第一个解答计分.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9741236494be9036357c5f14ddb21f74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d51f9147b8265c0276c1f2c2659197.png)
条件①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385e1e22a5aa983b7684abefd599543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5338ab53c25f3292017807fb077c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d22fb9b68c54d20b83c6275659785fa.png)
注:如果选择多个问题分别解答,按第一个解答计分.
您最近一年使用:0次
2021-05-10更新
|
1291次组卷
|
4卷引用:安徽省芜湖市2021届高三下学期5月教育教学质量监控理科数学试题
安徽省芜湖市2021届高三下学期5月教育教学质量监控理科数学试题北师大版(2019) 选修第二册 名师精选 第二单元 等差数列 B卷(已下线)卷03 等差数列·B卷·能力提升 -【重难点突破】2021-2022学年高二数学名校好题汇编同步测试卷(人教A版选择性必修第二册)人教B版(2019) 选修第三册 名师精选 第二单元 等差数列 B卷
4 . 在①
,②
③
这三个条件中任选,补充在下面的问题中.
问题:已知
为等差数列,设其前n项和为
,___________,是否存在正整数m,k(其中
),使得
.成立?若存在,写出m,k满足的关系式;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a83d3c96529415d15d9ef03f80aa5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f80f08180179c821d30983f2950347b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0e314e4a3bc2753bdb38c3f62f4e42.png)
问题:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b66a3969de120b50c1c2643a89629ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0942a9ad4f1a3bf81b58d760bd9e7a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d773bf952706a0734cbe73de479fe5cb.png)
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2021-05-09更新
|
1085次组卷
|
3卷引用:湖北省武汉市2021届高三下学期4月质量检测数学试题
湖北省武汉市2021届高三下学期4月质量检测数学试题(已下线)第七章 数列 专练14—结构不良型问题(大题)-2022届高三数学一轮复习人教A版(2019) 选修第二册 过关斩将 名优卷 第四章 章末综合测试卷
5 . 已知等比数列
满足
,
.
(1)求
的通项公式;
(2)从条件①、条件②这两个条件中选择一个作为已知,求数列
的前
项和
.
条件①:设
;
条件②:设
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25fc6e4698a74a39097e891812c976ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb15c79e32c2fb6f7d8862885907c4a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)从条件①、条件②这两个条件中选择一个作为已知,求数列
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
条件①:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40185377bf23c0aef1f590d2a77cf452.png)
条件②:设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da775220f9e2352d1b953b40f0e0150.png)
您最近一年使用:0次
2021-05-08更新
|
416次组卷
|
6卷引用:北京市东城区2021届高三下学期二模数学试题
解题方法
6 . 已知数列
是等差数列,其前
项和为
,且
,
.数列
为等比数列,满足
,
.
(1)求数列
、
的通项公式;
(2)若数列
满足
,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/b1dfe5b322577f02fd19caab8cf20170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b170560f44bdef56b9248ffa10b1c91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c968ef8f37cbc55d57380015e0229f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4e1d8d8a674b33bc520e809702cbda.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca857b7a6a1fe09827ecaa5f4c036069.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
2021-05-08更新
|
410次组卷
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8卷引用:安徽省淮南市2020-2021学年高三一模数学(文)试题
安徽省淮南市2020-2021学年高三一模数学(文)试题安徽省淮南市2021届高三下学期一模理科数学试题(已下线)安徽省合肥市2021届高三下学期第二次教学质量检测理科数学试题安徽省淮南市2021届高三下学期一模文科数学试题(已下线)专题24 数列(解答题)-2021年高考数学(理)二轮复习热点题型精选精练(已下线)专题22 数列(解答题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题23 数列(解答题)-2021年高考数学二轮复习热点题型精选精练(新高考地区专用)云南省楚雄天人中学2020-2021学年高二3月月考数学(文)试题
解题方法
7 . 已知等差数列
满足
,
,
的前
项和为
.
(1)求
及
;
(2)令
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8c45e4c4ab30665338dd87a2258f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1031daed317fb00a3a29d294c66ed43.png)
![](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)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ac94d7beb18923be4ffaff0b0b2883f.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)
您最近一年使用:0次
2021-05-08更新
|
270次组卷
|
4卷引用:高考新疆维吾尔自治区乌鲁木齐地区2021届高三二模数学(理)试题
名校
解题方法
8 . 在等差数列
中,
,
,数列
满足
.
(1)求数列
、
的通项公式;
(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/f09af4ec36b53aeb644ed16cfe725957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7def23f30138e0b7c4c1e498d6903a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbaf451bd4aaf066c39c389a26e6ed1b.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe8d083bac003a1d614d639f68e0a92.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
名校
解题方法
9 . 已知等差数列
的前
项和为
,且
,
.
(1)求
的通项公式;
(2)
,
,求
前10项和为
![](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/fca2cc2768794136c1e4da47d2f0873e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6c6cc853aa993cf3f53c4675303e7c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffa80d0a0a8512ba0a3442ff65b7a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc1efe01d419af89e83ea54b5679b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3cf40c3b4e46c1c52d7eadff64a9ec4.png)
您最近一年使用:0次
2021-05-06更新
|
185次组卷
|
2卷引用:黑龙江省哈尔滨市第九中学2021届高三第二次模拟考试文科数学试题
名校
10 . 记实数
、
中的较大者为
,例如
,
.对于无穷数列
,记
(
),若对于任意的
,均有
,则称数列
为“趋势递减数列”.
(1)根据下列所给的通项公式,分别判断数列
是否为“趋势递减数列”,并说明理由.
①
,②
;
(2)设首项为
的等差数列
的前
项和为
、公差为
,且数列
为“趋势递减数列”,求
的取值范围;
(3)若数列
满足
、
均为正实数,且
,求证:
为“趋势递减数列”的充要条件为
的项中没有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53ad6b511253288bb1a39cf30a82e644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb626a543683ed841d9bfbe27d8aaea2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4efa2bfeae46035438472aa935d3b423.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac663b57dc8fbaacb1602e72c16cf023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5776ec7059c208daf01ca48a34915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9061f8214290bca8739be868526443d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(1)根据下列所给的通项公式,分别判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d21525bafaecd7d5462f080ec663804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc150cfe321e5601480c07674cb7f811.png)
(2)设首项为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](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/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cce224c28ca451c4f105dc3b077736cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d813f3ca8db41a4db6c18eac30fef98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa3facc7f0df3b9360f71c6685a9a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d813f3ca8db41a4db6c18eac30fef98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d813f3ca8db41a4db6c18eac30fef98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
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2021-05-05更新
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4卷引用:上海市普陀区2021届高三二模数学试题
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