名校
解题方法
1 . 设等差数列
的前n项和为
,已知
.
(1)求
的通项公式;
(2)设数列
的前n项和为
,从条件①、条件②、条件③这三个条件中选择一个作为已知,使得数列
唯一确定,求
.
条件①:
;条件②:
;条件③:
.
![](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/44649ea0310bf3a8398288861b51e62c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c17d2c818b56246491665bf30afb9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f5d9df6ecb6fd4085c0d2dcd9806e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f307474904bb52743dc8c34a7aaddc8e.png)
您最近一年使用:0次
名校
解题方法
2 . 已知数列
的前
项和为
,
, .是否存在正整数
(
),使得
成等比数列?若存在,求出
的值;若不存在,说明理由.
从①
,②
, ③
这三个条件中任选一个,补充在上面问题中并作答.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc329b32ecf0f0532d09a8a21343e8cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107b678af68f3014c0f7b02120a283d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
从①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9afb0bb52be6b7b40004eb8767f5fab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eae302bb21fc5d689463792b6540fdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300dca231e2f4b37f70900b33439d5e.png)
您最近一年使用:0次
2020-06-15更新
|
525次组卷
|
3卷引用:北京市房山区2020届高三第二次模拟检测数学试题
3 . 已知数列
的前n项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b559d9c5dd054ccffe52b5a8f080b6.png)
.
(1)求数列
的通项公式;
(2)在数列
中,
,
,求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b559d9c5dd054ccffe52b5a8f080b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d307ec71820b6536453fbdb5069da3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52c2a65db6472ffd59097866e7644b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb27cc29c836ab7b82ad4a3acde8a3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
您最近一年使用:0次
2020-11-22更新
|
470次组卷
|
3卷引用:北京海淀北京19中2016-2017学年高一下学期期中考试数学试题
10-11高三上·湖北黄冈·阶段练习
名校
4 . 已知数列
是一个公差大于
的等差数列,且满足
,
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)若数列
和数列
满足等式:
(
为正整数),求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5e0afa048e0528e85e1e9e23995ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0997f872e498cb3db3198a824d694c3.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)若数列
![](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/0e4d951cb4393aeb895c71fae7e1a565.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.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/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2016-11-30更新
|
1346次组卷
|
12卷引用:北京市人大附中2017-2018学年高三十月月考数学(文)试题
北京市人大附中2017-2018学年高三十月月考数学(文)试题2017年北京市人大附高三文十月月考试题(已下线)2011届湖北省黄冈中学高三10月月考理科数学试题(已下线)2011届浙江省金华一中高三模拟考试数学(文)2015-2016学年贵州花溪清华中学高一6.25周练数学卷河南省南阳市第一中学2017-2018学年高二上学期第一次月考数学试题【全国百强校】广东省华南师范大学附属中学2019届高三上学期第二次月考数学(文)试题人教A版 成长计划 必修5 第二章数列 高考链接苏教版(2019) 选修第一册 必杀技 第四章 专题6 数列的综合应用人教B版(2019) 选修第三册 必杀技 第五章 专题3 数列的综合应用浙江省杭州学军中学2021-2022学年高二下学期数学竞赛试题福建省南安国光中学2023届高三上学期10月月考数学试题
5 . 已知数列
中,前n项为和
其中n∈N*,
=1,再从条件①,条件②,条件③这三个条件中选择一个作为已知,使得数列
唯一确定并解答以下问题:
(1)求
的通项公式;
(2)数列
中是否存在三项成等差数列?请写出解答过程.
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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
条件①:![]() ![]() ![]() |
您最近一年使用:0次
名校
6 . 已知数列
的前
项和
满足
.
(Ⅰ)求
,
,
的值;
(Ⅱ)已知数列
满足
,
,求数列
的通项公式.
![](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/92e9c35ac3a0cc139b50d2cf4b7a08ee.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(Ⅱ)已知数列
![](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/e194e7f25976502f399a81c56396ebd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
2018-04-14更新
|
665次组卷
|
3卷引用:北京市朝阳区2018年高三一模数学(文)试题
7 . 已知
是等差数列
的前
项和,且
,
.
(Ⅰ)求
的通项公式;
(Ⅱ)若等比数列
满足
,
,求
的前
项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/a51c55e7bfb89ad0113afaf43834438c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/222c4340e814076ed2d80d20d38b9ae8.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(Ⅱ)若等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c968ef8f37cbc55d57380015e0229f77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a09e50d4c276fab52d0999bb5cf329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
解题方法
8 . 已知数列
的前
项和
满足
,
,
.
(1)如果
,求数列
的通项公式;
(2)如果
,求证:数列
为等比数列,并求
;
(3)如果数列
为递增数列,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://img.xkw.com/dksih/QBM/2015/3/4/1571991218978816/1571991224967168/STEM/7c636ecab57248cb91f6f9cd4f56506a.png?resizew=13)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f1f75a83ba2567f7ec5b0f735afee31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce7cc3b5e1c128869095ebab91100c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8e3c9f6f00803d033d60ecc03be61a.png)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558e11d700481dc414d5d073b4b88a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2f2d7c81cb44416bcdf59419637682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbe110635863de83f12009fc1d76d408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)如果数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
9 . 现有
个(
)实数
,它们满足下列条件:①
,②
记这
个实数
的和为
,
即
.
(1)若
,证明:
;
(2)若
,满足题设条件的5个实数构成数列
.设
为所有满足题设条件的数列
构成的集合.集合
,求
中所有正数之和;
(3)对满足题设条件的
个实数构成的两个不同数列
与
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0aacbe5c1d06633da14e88d91a3d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82df2e4e85db5a0f6ea909805ac9f775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03a24335c8f3b2391191405837e82208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6fe0a3947b0984774eaaec05afddd4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82df2e4e85db5a0f6ea909805ac9f775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1752474698cd5466dd180df0a00ba9c.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/725c0894f1ca38c24155ee06e37e9ce5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50e7dc98803a2a5e690decc3d25e8f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ae508dea164e429c1f0cc0c3631c59.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7a1d739890a8951586e23b78b035bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62d1138048a41c38578b8c810c1ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)对满足题设条件的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b764d9d35dae87b31711545f9864d2f1.png)
您最近一年使用:0次
10 . 设数列
的前
项和为
.已知
,
,
.
(1)写出
的值,并求数列
的通项公式;
(2)记
为数列
的前
项和,求
;
(3)若数列
满足
,
,求数列
的通项公式.
![](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/eaedaa6a265377ba21daff547870267b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe61d313eeca8ba47478a9de40540db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0496f142d8ae5acb06e83526eaa3ef87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ea014220aa658c8baa6e1f43e686a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f793e80c353209114454d3b1bac35e73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
2016-12-02更新
|
976次组卷
|
3卷引用:北京丰台二中2018届高三上学期期中数学(文)试题