名校
1 . 已知等差数列
,且
,则数列
的前7项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63358b30e86ef6806101d4d056b0a8fd.png)
______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a726dca669a073f20dd32e3c9a15c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63358b30e86ef6806101d4d056b0a8fd.png)
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2 . 平面内有
条直线,其中任意两条直线都相交,任意三条直线不过同一点,设这
条直线的交点个数为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f27f84764f1cca89ce3d93fc1cf603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
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3 . 记
为等差数列
的前
项和,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fea8545129a9d82bbfee563f7279fae.png)
___________ .
![](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/01401269748cb6a66c65cb932dc4b4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fea8545129a9d82bbfee563f7279fae.png)
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2021-01-25更新
|
142次组卷
|
3卷引用:四川省成都市武侯区成都市第七中学2019-2020学年高一下学期3月月考数学试题
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4 . 已知递减等差数列
中,
为
等比中项,若
为数列
的前
项和,则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98d35a377cdc45b6169bf2ba1a8b4a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb9c3832ed2813b3bb952a28f094e4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e603b277aba781cf78b7adf8fc7f053f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98d35a377cdc45b6169bf2ba1a8b4a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194592cb77de8a597d5d64e1c85c3249.png)
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2017-12-15更新
|
716次组卷
|
3卷引用:四川省成都市第七中学2018届高三上学期一诊模拟数学文试卷
5 . 已知函数
在
上单调,且函数
的图象关于
对称,若数列
是公差不为0的等差数列,且
,则
的前100项的和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f00bba28ce932fbcc82ed562994f031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0326c8521834089fc9e0a6db113931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3321759a8f795dd79fd12f713cc0549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
6 . 数列
满足:
,且对任意的
都有:
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8a66f215b82f27c5ccd5a1d310ca2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd9adbd2f3b54bdb350b802eb3612e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ce7fcad748c4d019e308ba9b1a5ae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0acca5aa6b2285d897a65c289c1b54ba.png)
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2016-12-04更新
|
824次组卷
|
5卷引用:2015-2016学年四川省成都七中实验学校高一下期中数学试卷
2015-2016学年四川省成都七中实验学校高一下期中数学试卷2015-2016学年四川省成都七中实验学校高一下学期期中考试数学试卷2017届河北衡水中学高三上学期第二次调研数学(理)试卷河北省保定市定州中学2021届高三上学期期中数学试题(已下线)“8+4+4”小题强化训练(28)数列的概念及表示法-2022届高考数学一轮复习(江苏等新高考地区专用)
10-11高一下·黑龙江鹤岗·期中
名校
7 . 设等差数列
的前
项和为
,若
,则
的通项
=_______ .
![](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/d5b4d8126101e419a7d4fcad9885fa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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2016-11-30更新
|
1061次组卷
|
5卷引用:2012-2013学年四川成都六校协作体高一下学期期中考试数学试卷
(已下线)2012-2013学年四川成都六校协作体高一下学期期中考试数学试卷(已下线)2010-2011年黑龙江省鹤岗一中高一下学期期中考试文科数学(已下线)2012-2013学年江苏省新马高级中学高一下学期期末考试数学试卷四川省德阳市广汉中学2022-2023学年高二上学期开学考试数学(理)试题人教A版(2019) 选修第二册 数学奇书 第四章 数列 4.2等差数列 4.2.2 等差数列的前n项和公式 第1课时 等差数列的前n项和
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解题方法
8 . 已知等差数列
的前
项和为
,
三点共线,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ed16bc1ac15e077c44956797fa3de1.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/01225eca2322a6136314dedadcafa994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf5c7df02af9cc95810c0882fd4aeac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ed16bc1ac15e077c44956797fa3de1.png)
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2017-10-17更新
|
1118次组卷
|
5卷引用:四川省成都市龙泉驿区第一中学校2019届高三12月月考数学(文)试题
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
名校
10 . 等差数列
的前
项和为
,
,且
,则
的公差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a358086122d509098a4d541b167842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
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