1 . 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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2 . 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
3 . 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
4 . 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
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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
5 . 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)
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2016-12-03更新
|
858次组卷
|
2卷引用:四川省新津中学2019-2020学年高一4月月考(入学)数学(理)试题
名校
6 . 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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7 . 《张丘建算经》是中国古代的著名数学著作,该书表明:至迟于公元5世纪,中国已经系统掌握等差数列的相关理论,该书上卷22题又“女工善织问题”:“今有女善织,日益功疾,初日织五尺,今一月曰织九匹三丈,问日益几何?”,大概意思是:有一个女工人善于织布,每天织布的尺数越来越多且成等差数列,第一天知5尺,30天共织九匹三丈,问每天增加的织布数目是多少寸?答案是__________ 寸.(注:当时一匹为四丈,一丈为十尺,一尺为十寸,结果四舍五入精确到寸)
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8 . 在等差数列
中,
,则
的前5项和
=______________ .
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/d2b6fc9311454dbeb95a368cd257b1c8.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/c64e74c195e3403d9ebb8454a4cbdea7.png?resizew=84)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/d2b6fc9311454dbeb95a368cd257b1c8.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2014/9/26/1571864397897728/1571864403419136/STEM/f0e576d4a8824665a7f90163023dcb27.png?resizew=19)
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9 . 记
是等差数列
的前
项和.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.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/4927f5e4c0004453b4071074b543fa71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
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解题方法
10 . 已知数列
为等差数列,若
,则
的前项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1984ca70bed63181267bd539121f48bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
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2016-12-03更新
|
724次组卷
|
3卷引用:2014-2015学年四川省达州市大竹县文星中学高一6月月考数学试卷