名校
解题方法
1 . 记
为等比数列
的前n项和,已知
,
.
(1)求
的通项公式
(2)求
;
(3)判断
,
,
是否成等差数列,若是,写出证明过程;若不是,说明理由.
![](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/9a0bf1ebce75e828fd999cc04a319502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1dfe5b322577f02fd19caab8cf20170.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebadf2b3ec3dc92cd902eff76085ad46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a35d79a1b4df9e4aade6a92f35bea2.png)
您最近一年使用:0次
2020-03-04更新
|
288次组卷
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2卷引用:2020届湖南省衡阳市第八中学高三上学期第六次月考数学(文)试题
名校
2 . 已知
,在这两个实数
之间插入三个实数,使这五个数构成等差数列,那么这个等差数列后三项和的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-09-29更新
|
1639次组卷
|
12卷引用:湖南省长沙市雅礼中学2019-2020学年高三上学期第一次月考数学(文)试题
湖南省长沙市雅礼中学2019-2020学年高三上学期第一次月考数学(文)试题2020届湖南省长沙市雅礼中学高三上学期月考试卷(一)文科数学试题黑龙江省哈尔滨市第三中学2019届高三第一次模拟考试(内考)数学(理)试题黑龙江省哈尔滨市第三中学2019届高三第一次模拟考试(内考)数学(文)试题(已下线)专题02 数列(第一篇)-备战2020高考数学黄金30题系列之压轴题(新课标版)江西省南康区唐江中学2021届高三综合性考试数学(理)试题河南省郑州市第一中学2019-2020学年高二上学期期中数学(理)试题河南省郑州市第一中学2019-2020学年高二上学期期中数学(文)试题安徽省部分省示范中学2018-2019学年高一下学期期中数学试题四川省双流中学2019-2020学年高一下学期开学考试数学试题四川省成都市双流中学2019-2020学年高一(下)开学数学试题(已下线)4.2.2 等差数列的通项公式(2)-2021-2022学年高二数学同步培优训练系列(苏教版2019选择性必修第一册)
3 . 已知各项都是正数的数列
的前n项和为
,且
,数列
满足
.
(1) 求数列
的通项公式;
(2) 设数列
满足
,求和
;
(3) 是否存在正整数
,使得
成等差数列?若存在,求出所有满足要求的
;若不存在,请说明理由.
![](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/78515a07797b245e751d0937e2cbb875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f914bc18b8d61d1696ea4f46a23eee.png)
(1) 求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2) 设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cdc06d7684480bec7b86adaaaef111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e5e146226460d8a41162d993789a7a.png)
(3) 是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55336fb58f8e6ea100d0f62390a7265a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c67ea5ac329d33ab3d58a07cdf19b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c5fe8a9ad42e52a8a40242865c6752.png)
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2020-01-18更新
|
376次组卷
|
5卷引用:上海市实验学校2017-2018学年高三下学期第五次3月月考数学试题
上海市实验学校2017-2018学年高三下学期第五次3月月考数学试题上海师范大学附属中学2021届高三下学期3月月考数学试题江苏省扬州市2017-2018学年度第一学期期末调研测试高三数学试题(已下线)专题14 数列的综合应用-《巅峰冲刺2020年高考之二轮专项提升》(江苏)(已下线)2017-2018学年度下学期高中期末备考 【浙江版】高一【精准复习模拟题】 拔高卷01【教师版】
名校
4 . 设
是数列
的前
项和,对任意
都有
成立(其中
是常数).
(1)当
时,求
:
(2)当
时,
①若
,求数列
的通项公式:
②设数列
中任意(不同)两项之和仍是该数列中的一项,则称该数列是“
数列”,如果
,试问:是否存在数列
为“
数列”,使得对任意
,都有
,且
,若存在,求数列
的首项
的所有取值构成的集合;若不存在.说明理由.
![](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/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dd4a3acd033d1d6c2fee71f1aef12c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0f7a970985fb0aca1e85318df9ad96.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc485c166e59122857eb4d659681b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57252a5f8334406b88e5e0e749f209bc.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81377880fcf3a7adaf01416a99d34c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
②设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf4000fec5bf94d56935108d72af3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb9ad1e34877b0db02d0219332b0f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d236a265a6cc0f3d06a0e568ffa907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06da852d80f04a8d49d059320a248623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
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2019-12-03更新
|
355次组卷
|
4卷引用:上海市黄浦区大同中学2018-2019学年高三上学期12月月考数学试题
名校
解题方法
5 . 在数列
中,
,
,若
,则
的前
项和取得最大值时
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996073497848d3338263739b76a7d293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bb2abc884490eeb3eca7d77b764ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024adc9d8de69e7b79d8be88ce2020c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2019-05-07更新
|
2491次组卷
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7卷引用:2020届湖南省长沙市雅礼中学高三上学期第2次月考数学(文)试题
名校
解题方法
6 . 已知数列
的前
项的和为
,记
.
(1)若
是首项为
,公差为
的等差数列,其中
,
均为正数.
①当
,
,
成等差数列时,求
的值;
②求证:存在唯一的正整数
,使得
.
(2)设数列
是公比为
的等比数列,若存在
,
(
,
,
)使得
,求
的值.
![](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/1d9b4196cb1b032566b318290d7194b0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9632e7e5a6eb0c85cb44940c60618d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e82778985cd2e9f80ca7b7cabb1a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4336e21aa2b3fdf15f1b72463714830e.png)
②求证:存在唯一的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef9a7f77ebabd7f7f26c2aea18b683f.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442ed72e1c8c3586b799220e9fadaed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68efb961550a83f5a52a4fd16917d27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c23407e3cdc55f7e4df2c8cf335396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5c6b818605e0ea64c59e9edde27614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
您最近一年使用:0次
2020-03-20更新
|
323次组卷
|
4卷引用:2020届江苏省南通中学高三上学期第二次调研测试数学试题
2020届江苏省南通中学高三上学期第二次调研测试数学试题2016届江苏省南京市高三第三次模拟考试数学试卷(已下线)《2018届优等生百日闯关系列》【江苏版】专题二 第五关 以子数列或生成数列为背景的解答题2020届江苏省南通市如皋中学、如东中学高三下学期阶段联合调研数学试题
名校
7 . 数列
满足:
,
,且
,
,
成等差数列,其中
.
(1)求实数
的值及数列
的通项公式;
(2)若不等式
成立的自然数
恰有4个,求正整数
的值.
![](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/597b184943b710ea49c751c9a35a1707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d93c1ae7b22099a5d4c1c4241e5ca18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb8986c25f664371860caf1d6d50e6b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
您最近一年使用:0次
2019-04-14更新
|
812次组卷
|
3卷引用:上海市南洋模范中学2019届高三下学期3月月考数学试题
8 . 在数列
中,已知
,设
为
的前n项和.
(1) 求证:数列
是等差数列;
(2) 求
;
(3) 是否存在正整数
,使
成等差数列?若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb0054c34ec26e44ceef7d708f081a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(1) 求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b09ba0d55a8817f39a34fd920b6ec30.png)
(2) 求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3) 是否存在正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55336fb58f8e6ea100d0f62390a7265a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69324e3871131573e5cd62b3e4105f19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c5fe8a9ad42e52a8a40242865c6752.png)
您最近一年使用:0次
2020-01-18更新
|
502次组卷
|
3卷引用:2017届江苏徐州等四市高三11月模拟考试数学卷
名校
9 . 若一个钝角三角形的三内角成等差数列,且最大边与最小边之比为
,则实数
的取值范围是____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2017-06-29更新
|
1088次组卷
|
6卷引用:上海市位育中学2017届高三上学期9月零次考试数学试题
10-11高二·安徽·期末
名校
解题方法
10 . 已知函数
,且
成等差数列, 点
是函数
图象上任意一点,点
关于原点的对称点
的轨迹是函数
的图象.
(1)解关于
的不等式
;
(2)当
时,总有
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547041bb89115ddf174271b146a63bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b28f6424fa7fa4048e587416bc8a9df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
(1)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c3bfe8f7b456b1fb207618966b1214b.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04614d0fac9cde995374a43d4323b723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49e20077c8bdf330f4dd21cb570569d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2016-12-01更新
|
1123次组卷
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5卷引用:山东省青岛市青岛第二中学2022-2023学年高三上学期12月月考数学试题
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