名校
1 . 两个等差数列
和
,其前
项和分别为
,
,且
,则
等于( )
![](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/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/236fe9db95868b438b2a9e62c688a801.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db662896f7554955c94b0171619f3220.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2023-01-03更新
|
1720次组卷
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8卷引用:湖北省黄石市阳新高级中学2021-2022学年高二上学期期末数学试题
2 . 数列
的前n项和记为
,
,
,
,
,
.
(1)求
的通项公式;
(2)求证:对
,总有
.
![](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/366dfedff1a1a96ec27650375b680059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3306609180547de8e956aca46a5daa11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27570be5b1e6a8c58cb2aa9e69076ac.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求证:对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/248091e08cab8686e118fe65af06ec5a.png)
您最近一年使用:0次
2019-10-29更新
|
624次组卷
|
4卷引用:湖北省黄石市大冶市第一中学2019-2020学年高三文科复读班12月月考数学试题
名校
3 . 已知等差数列
的前
项和为
,若
,
,则
等于
![](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/43d799987e7af9561215baf4f99c7777.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710f835167d2b180e97f8ed181fd0808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc858b7a95c5006a44067022da09f667.png)
A.2 | B.3 | C.4 | D.8 |
您最近一年使用:0次
2019-10-23更新
|
1827次组卷
|
9卷引用:湖北省黄石市第二中学2020-2021学年高三上学期10月测试数学试题
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