1 . 已知数列
的通项公式
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb23c6a9e8a42faef0a84be8ad6b008.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f448cebfaf66b70a4c8485bde0398d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb23c6a9e8a42faef0a84be8ad6b008.png)
您最近一年使用:0次
2019-07-09更新
|
810次组卷
|
2卷引用:四川省攀枝花市2018-2019学年高一下学期期末数学试题
2 . 已知等差数列
的前
项和为
,若
,则
=_______
![](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/a8d2035ae05e21ae00a883863521199f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da62fb1b88d79e7e4e05a488d78dd0f7.png)
您最近一年使用:0次
2020-03-04更新
|
533次组卷
|
4卷引用:四川省遂宁市2018-2019学年高一下学期期末数学试题
3 . 已知等差数列
的前
项和为
,
,
,则数列
的前
项和为__________ .
![](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/85f7519e1b1dd927bc634eedafc88820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce50ef10bb9acba4a731c6668be9445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4844ada5b5eb39d704345bb4e6080d99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
名校
4 . 若数列
的首项
,且
;令
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99261c8710224e047dfc21bfd55aabde.png)
_____________ .
![](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/0f0abbc453bbe66c0ee6cc56ae23f12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e94e22de952e2b63bb9a750a77200d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99261c8710224e047dfc21bfd55aabde.png)
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2017-02-08更新
|
1526次组卷
|
8卷引用:四川省凉山州宁南中学2023-2024学年高二上学期期末模拟数学试题(二)
解题方法
5 . 等差数列
的前
项和为
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.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/9b2395ccadbeb8353ead0d573ca02c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
您最近一年使用:0次
2017-03-30更新
|
1362次组卷
|
4卷引用:四川省泸州市合江县马街中学校2023-2024学年高二上学期期末数学试题
四川省泸州市合江县马街中学校2023-2024学年高二上学期期末数学试题上海市北虹高级中学2018-2019学年高一下学期期末考试数学试题2017届江西省鹰潭市高三第一次模拟考试数学(文)试卷(已下线)江西省鹰潭市2017届高三第一次模拟考试文数试题
6 . 已知等差数列
的前
项和为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46293a2dd0d822a27f0b57e33c7e6f34.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/1ca688e61891d8ef393856db266c3a0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46293a2dd0d822a27f0b57e33c7e6f34.png)
您最近一年使用:0次
2020-01-18更新
|
300次组卷
|
2卷引用:四川省德阳市2018-2019学年高一下学期期末数学(文)试题
名校
7 . 《张丘建算经》中女子织布问题为:某女子善于织布,一天比一天织得快,且从第2天开始,每天比前一天多织相同量的布,已知第一天织5尺布,一月(按30天计)共织390尺布,则从第2天起每天比前一天多织尺布______ 尺布.
您最近一年使用:0次
2020-08-18更新
|
199次组卷
|
2卷引用:四川省雅安市2019-2020学年高一下学期期末考试数学试题
解题方法
8 . 若等差数列
的前5项和
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2fcd86b9ed6819116a261629f96fae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
您最近一年使用:0次
名校
解题方法
9 . 若数列
是正项数列,且
则
=__________ .
![](https://img.xkw.com/dksih/QBM/2015/9/23/1572235547754496/1572235553718272/STEM/22cd3115b79243adb643e62a28310d24.png?resizew=32)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b94a633657afb5490a2b497a3a95d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e64b3218b45bf0875442481ba14e747.png)
您最近一年使用:0次
2016-12-03更新
|
858次组卷
|
2卷引用:2014-2015学年四川省成都树德中学高一下学期期末考试数学试卷
10 . 已知等差数列
的前
项和为
,若
,
,则
的公差为______ .
![](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/1ee6d51b5521d770a8b7994249f32f44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e26faf2d524402fefa06823506d1971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次