解题方法
1 . 在①
,
;②
,
,
;③
,
这三个条件中任选一个,补充在下面问题中若问题中的
存在最大值,请求出最大值;若不存在,请说明理由.设等差数列
的前
项和为
,___________,
是否存在最大值?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b578ea25b5698caaeaec39ce164ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98a2e9eacc77fc4a148e493b865c46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdf53108bee755f5aa9a34ea4d163e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ad3bdc2cf20eefdf5b999239cc6f935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a0616545a308bfff66eaa1d422077fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cceacfd0395da804e9fd4878fbd93080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19557eeb69331a65fa03fa64c4a41654.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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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2020-07-27更新
|
603次组卷
|
2卷引用:山东省2020届普通高等学校招生统一考试高三数学必刷卷(一)
解题方法
2 . 已知正项等差数列{an},{bn}的前n项和分别是Sn,Tn,且(3n﹣1)2Sn2﹣n(3n﹣1)SnTn﹣2n2Tn2=0对任意的n∈N*恒成立,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ef6e5e70c77dda4dd3c637deeb2317.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-07-26更新
|
300次组卷
|
2卷引用:安徽省池州市2019-2020学年高一(下)期末数学(理科)试题
解题方法
3 . 记等差数列
的前
项和为
,满足
,
,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/a0e65d2e6720cc386bdbea11981c97f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f9744f7b92af7046f9f162c080ef20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce18c8141a58131ecc71e0148088843.png)
您最近一年使用:0次
解题方法
4 . 已知等差数列
中,
,
,则
的前10项和
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693734765399876e9e93cdb110231c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea37db65d75b68f558f08762eb40420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
A.![]() | B.![]() | C.100 | D.50 |
您最近一年使用:0次
名校
解题方法
5 . 设Sn为等差数列{an}的前n项和,已知在Sn中只有S7最小,则S15﹣2S13_______ 0.(填“>”或“=”或“<”)
您最近一年使用:0次
2020-07-23更新
|
237次组卷
|
3卷引用:东北三省三校2020届高三下学期第四次模拟考试数学(理)试题
6 . 设等差数列
的前n项和为
,若
,则满足
的最小正整数
的值为( )
![](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/e4a3236ba4c299da70055bc301b94a99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49763402b2f2023f0ba64c37924267d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-07-17更新
|
711次组卷
|
3卷引用:四川省宜宾市2019-2020学年高一下学期期末考试数学试题
四川省宜宾市2019-2020学年高一下学期期末考试数学试题(已下线)第22讲 数列的单调性与最值问题-2022年新高考数学二轮专题突破精练天津市和平区第二南开学校2023-2024学年高二上学期第三次月考数学试题
7 . 已知
(其中
)的展开式中第9项,第10项,第11项的二项式系数成等差数列.则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5b72e8d72ec6a62a40eb5391c414d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b76766960095c005d4a582eddce0542.png)
A.n的值为14 | B.展开式中常数项为第8项 |
C.展开式中有理项有3项 | D.二项式系数最大的项是第7项 |
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2020-07-16更新
|
1066次组卷
|
5卷引用:江苏省苏州市第四中学2019-2020学年高二下学期期中数学试题
江苏省苏州市第四中学2019-2020学年高二下学期期中数学试题(已下线)6.3 二项式定理(精练)-2020-2021学年高二数学一隅三反系列(人教A版2019选择性必修第三册)江苏省园三2019-2020学年高二下学期5月月考数学试题人教A版(2019) 选修第三册 突围者 第六章 素养拓展(已下线)6.3二项式定理C卷
解题方法
8 . 若
是公差不为
的等差数列,满足
,则该数列的前
项和
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4c144ceb7c361456ad9e88578238585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ad4e59d7081cf19021423a984bc29.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
9 . 已知函数
为定义域
上的奇函数,且在
上是单调递增函数,函数
,数列
为等差数列,且公差不为0,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b093a4e48364033935c951a75147e9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004ce099a2145ed55fe14b2013d8e083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f51ed8b8dbf7906f9a5be5766603bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b093a4e48364033935c951a75147e9.png)
您最近一年使用:0次
2020-07-15更新
|
302次组卷
|
2卷引用:2020届上海市上海交通大学附属中学高三下学期考前测试数学试题
名校
解题方法
10 . 椭圆
:
的长轴长为4,左、右焦点分别为
、
,过右顶点
且斜率为
的直线与椭圆
交于另一个点
,且点
在
轴上的射影恰好为点
.
(1)求椭圆
的方程;
(2)若
,直线
:
与椭圆
交于
,
两点,设直线
,
的斜率分别为
和
,若
,
,
成等差数列,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980f8aaeca69f195335110f8051daf39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0bc80d700368fb8abd76d8f1652a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e769e2c4c658c63e429e5a8926666504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/256c9fe109bb69f0087399129ed02d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14f628b1103d160c21b94bfcb55ae46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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