1 . 已知数列
满足
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b9693e14b57ae06efbe931c79107c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f2dcf55c879ef5d7195a42b4b54cadb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-02-26更新
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7卷引用:安徽省宣城市泾县中学2021-2022学年高三上学期12月质量检测文科数学试题
名校
2 . 在等差数列
中,
,其前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.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/b600140cdc2df47d1deec870d81ed938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
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2022-02-21更新
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1408次组卷
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9卷引用:安徽省皖南八校2021-2022学年高三上学期12月第二次联考理科数学试题
安徽省皖南八校2021-2022学年高三上学期12月第二次联考理科数学试题福建省莆田第一中学2021-2022学年高二上学期期末考试数学试题(已下线)等差数列的前n项和公式(已下线)4.2.2 等差数列的前n项和公式(精练)(1)(已下线)4.2.2等差数列的前n项和(第2课时)(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)(已下线)4.2.2等差数列的前n项和公式(2)(已下线)第五章 数 列 专题2 等差数列中的计算(已下线)第五章 数列 专题2 等差数列中的计算(已下线)1.2.2 等差数列的前n项和8种常见考法归类(1)
3 . 在等差数列
中,已知前n项和为
,
,
.
(1)求数列
的通项公式及
的表达式;
(2)设
,求数列
的前n项和
的表达式.
![](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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25aec899081e8becb10b0e3f7418e02.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab59fe7bb6eab1764ef233599aaa3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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2022-02-14更新
|
245次组卷
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2卷引用:安徽省安庆市怀宁中学2021-2022学年高三上学期12月联考理科数学试题
名校
4 . 已知数列
的前n项和为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a838e2eadb66ec92b8e4216581d89443.png)
______ .
![](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/25a1cd585a8aa6b1622f361266a5382d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a838e2eadb66ec92b8e4216581d89443.png)
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2022-02-14更新
|
255次组卷
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2卷引用:安徽省安庆市怀宁中学2021-2022学年高三上学期12月联考理科数学试题
名校
5 . 已知等差数列
,等比数列
的前n项和之积为
,设等差数列
的公差为d、等比数列
的公比为q,则以下结论正确的个数是( )
①
②
③
④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3154e42ce5bee86af29648da9a8e02a4.png)
![](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/d382ff0d3d3a659a79e233d81e86ff86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c1344592c925b273f2cb9b9e47ebbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4995fa0403e013d888c0935ebfe15024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3154e42ce5bee86af29648da9a8e02a4.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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2022-02-14更新
|
130次组卷
|
3卷引用:安徽省安庆市怀宁中学2021-2022学年高三上学期12月联考理科数学试题
名校
6 . 意大利著名数学家斐波那契在研究兔子的繁殖问题时,发现有这样的一列数:1,1,2,3,5,8,…,该数列的特点是前两个数均为1,从第三个数起,每一个数都等于它前面两个数的和.人们把这样的一列数所组成的数列
称为“斐波那契数列”,数列
的前
项和为
,则下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
7 . 设等比数列
的前
项和为
,则“
”是“
”的( )
![](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/179513ce80436471efbe1d9b31735f7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f00dae44d94b0499bd40de73772b4b.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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2022-02-11更新
|
666次组卷
|
2卷引用:安徽省铜陵一中、安徽师大附中2021-2022学年高三上学期12月联考理科数学试题
名校
解题方法
8 . 已知等差数列
的前n项和为
,若
,
,则
( )
![](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/6dc9cd704823fc7de625c3bce366b7e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462b733b51c54407655bd9fe71e88938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc625e19e7ca2b9d097f67a3d472e47.png)
A.220 | B.240 | C.260 | D.280 |
您最近一年使用:0次
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9 . 已知等差数列
的前10项之和为40,前20项和为120,则它的前40项的和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
A.240 | B.300 | C.360 | D.400 |
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名校
解题方法
10 . 已知等差数列
的前
项和为
,且
.
(1)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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22824450db45bc104092954dccbafd2.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bdbde4eb7e4d4033bb9053b6c806e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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