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1 . 等差数列
,
的前
项和分别为
,
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86db900cdee093a7e101a4d96d2c6fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4863086901be9beea78c25d48ceb460.png)
A.2 | B.3 | C.4 | D.5 |
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解题方法
2 . 设等差数列
的前
项和为
,首项
,且
.数列
的前
项和为
,且满足
.
(1)求数列
和
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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fb74d729d87283a5d2123d6f1db1ac.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e94a9d55364fcc3e19a55be25ac2f41.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac08064920a46f07f05b0c9f477208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3bdeaf603b021a7de7a577a401fb5e.png)
您最近一年使用:0次
2020-05-03更新
|
595次组卷
|
4卷引用:江西省萍乡市芦溪中学2023届高三上学期开学考数学(文)试题
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3 . 设
是等差数列
的前
项和,若
,则
( )
![](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/f2564b5351fc1a4bd2c8595b719db9e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c20b7f5c990b251c9eac2b8049cffa7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-08-22更新
|
1844次组卷
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3卷引用:江西省南昌市进贤一中2019-2020学年高一下学期第一次月考(网上)数学试题
(已下线)江西省南昌市进贤一中2019-2020学年高一下学期第一次月考(网上)数学试题广东省实验中学2018-2019学年高一下学期期末考试数学试题河北省唐山市第二中学2019-2020学年高一下学期月考I数学试题
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4 . 等差数列
中,
,且
,且
,
是其前
项和,则下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48efbeef120efd6ebf13e5f40f6ad4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958049bb7786337bd8a660b96a5e2b3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc8afbf76287e0779601ea707de0552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
B.![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
D.![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
2019-12-15更新
|
264次组卷
|
2卷引用:江西省抚州市金溪县第一中学2019-2020学年高一下学期第一次月考数学试题