名校
解题方法
1 . 设
是等差数列,
,且
成等比数列.
(1)求
的通项公式;
(2)记
的前
项和为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c1344592c925b273f2cb9b9e47ebbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322d7d378d18d7fae6d2d7c98e3de001.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)记
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2020-08-07更新
|
1298次组卷
|
3卷引用:黑龙江省大庆市第四中学2019-2020学年高一下学期第三次检测数学(文)试题
黑龙江省大庆市第四中学2019-2020学年高一下学期第三次检测数学(文)试题(已下线)【南昌新东方】江西省南昌市南昌县莲塘二中2020-2021学年高二上学期第一次月考数学(理)试题四川省简阳市阳安中学2020-2021学年高三10月月考数学(文)试题
名校
2 . 已知
是公差为2的等差数列,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4dd549dc19c31ccb2fc86a9ebea9db5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0382b4a2ab0657d2d6830bb6be2b17b6.png)
A.12 | B.14 | C.16 | D.18 |
您最近一年使用:0次
2020-07-31更新
|
352次组卷
|
2卷引用:黑龙江省哈尔滨市第三中学2019-2020学年高一下学期期末考试数学试卷
10-11高二上·辽宁沈阳·阶段练习
名校
3 . 已知
成等差数列,
成等比数列,则
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a25fe0e04cc648a1e72f9fef7aa748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7350c99e82ef8de7e2847eed27b8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4e1e7969a2a04aec4d2eca0920205a.png)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
您最近一年使用:0次
2024-03-21更新
|
412次组卷
|
11卷引用:2010-2011年黑龙江省牡丹江一中高一下学期期中考试数学
(已下线)2010-2011年黑龙江省牡丹江一中高一下学期期中考试数学2016-2017学年黑龙江省牡丹江市第一高级中学高一3月月考数学试卷甘肃省张掖二中2016-2017学年高一下学期期中考试数学试题(已下线)2010年辽宁省沈阳二中高二上学期10月月考理科数学卷【区级联考】广东省深圳市龙岗区2017-2018学年高二上学期期末考试数学文试题甘肃省张掖市2020-2021学年高二上学期期末数学(理)试题陕西省铜川市耀州中学2021-2022学年高二上学期第一次月考数学试题人教B版(2019) 选修第三册 北京名校同步练习册 第五章 数列 本章小结福建省福州市第十一中学2023-2024学年高二上学期期末考试数学试卷(已下线)专题03等比数列及其前n项和6种常考题型归类【好题汇编】-备战2023-2024学年高二数学下学期期末真题分类汇编(北师大版2019选择性必修第二册)(已下线)专题03数列期末7种常考题型归类【好题汇编】-备战2023-2024学年高二数学下学期期末真题分类汇编(人教B版2019选择性必修第三册)
4 . 已知
为等差数列,其公差为2,且
是
与
的等比中项,
为
前
项和,则
的值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
![](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/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
您最近一年使用:0次
2020-07-24更新
|
305次组卷
|
6卷引用:黑龙江省哈师大附中2019-2020学年高一(下)期末数学试题
黑龙江省哈师大附中2019-2020学年高一(下)期末数学试题2020届江苏省徐州市高三下学期春季联考数学试题(已下线)数学-6月大数据精选模拟卷01(北京卷)(满分冲刺篇)湖南省长沙市第一中学2020-2021学年高三上学期月考(三)数学试题(已下线)卷02-【赢在高考·黄金20卷】备战2021年高考数学全真模拟卷(北京专用)陕西省渭南市2022届高三教学质量检测(一)文科数学试题
解题方法
5 . 已知
是公差为3的等差数列,数列
满足
,
,
.
(Ⅰ)求
的通项公式;
(Ⅱ)求
的前n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/4995fa0403e013d888c0935ebfe15024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1793fecd8551ee9cd7b71e4c7c6a00e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31e4ebef0b20cce593ed13d259417bd.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
名校
6 . 在等差数列
中,
,
是它的前
项和,若
,且
与
的等比中项为4,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c071725b57da73341f421da5d0edf0c8.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ce64685821c3e55c07f151996ca8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab9119853bde7042db9c9cd79e38188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da4cd81500bdb43118150dbdb1541e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c071725b57da73341f421da5d0edf0c8.png)
您最近一年使用:0次
名校
解题方法
7 . 已知等差数列
满足
,
.
(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/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06df24b6309afa18b7ca81726c0c129.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/216876de04325fd250c38c485cbc34b7.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
名校
解题方法
8 . 已知公差
的等差数列
的前
项和为
,若
是
与
的等比中项,且
.
(1)求
的通项公式;
(2)若
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd71bc7e6668f90f259ad0b06dd60c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e801b490d2459e63b18277a837ea57fb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d005409790b3192705a181b2c8e7dfed.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
名校
解题方法
9 . 已知数列
的各项均为正数,
,其前n项和为
,且当
时,
,
,
成等差数列.
(1)求数列
的通项公式;
(2)若数列
满足
,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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361792c6ea1ea5cbdd809e63b27c89a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55e06de381c46e58d40aaced29d9297e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d754f2f4955f12094646107d4ba4b5aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
2020-07-11更新
|
175次组卷
|
2卷引用:黑龙江省齐齐哈尔市实验中学2019-2020学年高一下学期期中考试数学试题
名校
10 . 已知数列
是等差数列,若
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df1038200f2d97a52c716aab6c3bcb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b552c50a0610d4a04a8a20d721510d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ffbfb2502cc0ef8c5e1e60c567df35.png)
A.16 | B.24 | C.28 | D.40 |
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2020-06-26更新
|
433次组卷
|
2卷引用:黑龙江省哈尔滨市第六中学校2019-2020学年高一下学期返校适应训练数学试题