在等差数列
中,
,
,求数列
的前n项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181967fe81f94621cb446130c99c3121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae2e10f5581dcf754d898402775839f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91adba8efbf964e9e35547b0fd0ea36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
21-22高二·全国·课后作业 查看更多[5]
沪教版(2020) 选修第一册 同步跟踪练习 第4章 4.1(2)等差数列的前n项和(已下线)第四章 数列 讲核心 01(已下线)4.2.2 等差数列的前n项和公式(精练)(2)(已下线)4.2.2 等差数列的前n项和公式(2)(已下线)4.2.2 等差数列的前n项和公式——课堂例题
更新时间:2022-09-07 14:14:38
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相似题推荐
【推荐1】在①
成等比数列,②
,③
这三个条件中任选两个,补充在下面问题中,并完成解答.
已知数列
是公差不为0的等差数列,其前
项和为
,且满足__________,__________.
(1)求
的通项公式;
(2)求
.
注:如果选择多个方案分别解答,按第一个方案计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8aa010f7105f3ca426c8a34880abd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097f7e688074baee9d9a8e7b1468808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0954b93b4429f74f75da36dab440226.png)
已知数列
![](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)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b47d8120f7f1344d58d3ddf37a9eb47.png)
注:如果选择多个方案分别解答,按第一个方案计分.
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解答题-问答题
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较易
(0.85)
解题方法
【推荐2】如果等差数列
的前n项和为
,那么
,
,
是否成等差数列?你能得到更一般的结论吗?
![](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/5f3cf6f2bbe20a404fea41a4d2b1c4c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d84b38776b362f7d952c88ce410cf95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498cb7cdfb13582a36fbadbc9b8cdb52.png)
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解题方法
【推荐1】在等差数列
中,
,
.
(1)求
的通项公式;
(2)求
的表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329785900390130a04a57d0b55aaa569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eaea3fd43e6b9ce830aeef7b9a40a14.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79e561b942febb191e8abeb9d222dbe.png)
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【推荐2】已知等差数列
的前
项和为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf870c9867b360f144ec057ad81ba829.png)
(1)求
;
(2)求数列
的前30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/cf870c9867b360f144ec057ad81ba829.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955343df1beae941126810dbbb4dccb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f550f4135c46fbfb0c001e662cd8ff6.png)
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