1 . 设
是正项数列
的前n项和,且
,
(1)求数列
的通项公式;
(2)已知
,求
的值.
![](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/9450a72273297d201a197c8572742de6.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267c99ff3f6386113dbaa7b1e49612da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c234725f87d39653a89c40693b35d4db.png)
您最近一年使用:0次
2020-03-06更新
|
222次组卷
|
7卷引用:2016-2017学年辽宁省六校协作体高二下学期期初数学(文)试卷
名校
2 . 已知二次函数
的图象的顶点坐标为
,且过坐标原点O,数列
的前n项和为
,点
(
)在二次函数
的图象上.
(1)求数列
的表达式;
(2)设
(
),数列
的前n项和为
,若
对
恒成立,求实数m的取值范围;
(3)在数列
中是否存在这样的一些项,
,
,
,…
,…(
),这些项能够依次构成以
为首项,q(
,
)为公比的等比数列
?若存在,写出
关于k的表达式;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6203fafe7de8ef54c7642954218d8d2.png)
![](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/e41f32693d25ece7f8e22c34a183537f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb4c67541ad907940dad25bffe28410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8237f9de6150f514f15064352efdcb5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
(3)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c152d0a3bf4cd86a4984b780ad24dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c875ca82b2109313cbc19c07035a46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/126e72bc3c0d5656f2b4026c0b874579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b4cbbd4faf0c5d0721ad3710e30a82a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6361002b99eeae065f3f61ead4ed40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4625f87f77b36375db9083016c3c935f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c7b22e5f52c06444279fff9fdc5cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd66f2d242feff341cf586f57b0ad2ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55a7d201b7336a2b950c7fb05409bbf.png)
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名校
3 . 某工厂今年年初贷款a万元,年利率为r(按复利计算),从今年末起,每年年末偿还固定数量金额,5年内还清,则每年应还金额为万元.
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-02-04更新
|
456次组卷
|
3卷引用:上海市上海交大附中2017届高三下学期返校数学试题
上海市上海交大附中2017届高三下学期返校数学试题(已下线)第4章+指数与对数单元测试(重点卷)-2020-2021学年高一数学十分钟同步课堂专练(苏教版2019必修第一册)辽宁省沈阳市第二中学2021-2022学年高二下学期期中数学试题
名校
4 . 设
是公比为
的等比数列,首项
,对于
,当且仅当
时,数列
的前
项和取得最大值,则
的取值范围为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa08a089a48737b6a0c47cd150b9f12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf8cadc870b9b43ab43e96aaefa1e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.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/9aa8a716a31b0f51b70fdf9bdb257909.png)
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2020-01-16更新
|
210次组卷
|
3卷引用:上海市七宝中学2017-2018学年高二上学期开学考试数学试题
名校
5 . 已知
为数列
的前
项和,
,
,
.
(1)求证:
为等差数列;
(2)若
,问是否存在
,对于任意![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
,不等式
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/6b8deea8082196cdcba86492c98158e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e978f1e285639bd61779209be4d93ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb58883caf5c8ca1e94389839d294b6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbf82935deed70b40b23725a2617fdc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25855f5435d292ad6d764ae6041514bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d7e9f86738335a22298559db41037a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70be8a30a090350929d38f56c1e49b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff1788d3b6f3687ad184cd144695b31.png)
您最近一年使用:0次
2020-01-15更新
|
261次组卷
|
3卷引用:上海市青浦高级中学2017-2018学年高三上学期开学考数学试题
名校
6 . 已知数列1、1、2、1、2、4、1、2、4、8、1、2、4、8、16、…,其中第一项是
,接下来的两项是
、
,再接下来的三项是
、
、
,以此类推,若
且该数列的前
项和为2的整数幂,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78697a69758b8d469a74236859514a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c187044e689bbe78aededb6b48f877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78697a69758b8d469a74236859514a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ad4668cc927e277289b2af718f0d91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c851ab8c7c8b2ac92092987a7e32493f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
A.440 | B.330 | C.220 | D.110 |
您最近一年使用:0次
2020-01-14更新
|
602次组卷
|
4卷引用:上海市南模中学2017-2018学年高三上学期开学考数学试题
上海市南模中学2017-2018学年高三上学期开学考数学试题(已下线)第四章 数列单元测试(提升卷)-2020-2021学年高二数学新教材单元双测卷(人教A版2019选择性必修第二册)广东省佛山市顺德区东逸湾实验学校2022-2023学年高二下学期3月月考数学试题甘肃省临夏、甘南两地2022-2023学年高二上学期12月期中联考理科数学试题
名校
7 . 定义在
上的函数
满足
,且
,则下面四个式子:①
;②
;③
;④
;与![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ae2c52b3ed8a399057da53637ac7dc.png)
相等的式子的序号为_________ (写出所有满足条件的式子的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd384d86840b7b158af41f56fe29c7d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6855784817151468771f29c0fc38fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/317ded343f7889b6ce99fb248c9181b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/957c0efaa3cece5cb7ef1468d391fed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b9f97e0f3248a44dc70e0ac77c842e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5199fe04f00ff3eca25ba8723311e0b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ae2c52b3ed8a399057da53637ac7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09597b9e9e5de228468cc34de4f0f5eb.png)
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2020-01-13更新
|
73次组卷
|
2卷引用:上海市延安中学2016-2017学年高三下学期开学考试数学试题
名校
8 . 已知无穷等比数列
中,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba5edb7ddaacdb7ef1fc5a87e67da02e.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f4e1236d7dc0366d9523d0cbb426be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e865c655a118db73cb2e43b7cd61916f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba5edb7ddaacdb7ef1fc5a87e67da02e.png)
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名校
9 . 设
是公比为
的等比数列,首项
,对于
,
,当且仅当
时,数列
的前
项和取得最大值,则
的取值范围为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa08a089a48737b6a0c47cd150b9f12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/680018f55067af9d7fa8bbd9bf6233d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-01-13更新
|
561次组卷
|
2卷引用:上海市延安中学2016-2017学年高三下学期开学考试数学试题
名校
10 . 定义:对于任意
,满足条件
且
(M是与n无关的常数)的无穷数列
称为M数列.
(1)若等差数列
的前
项和为
,且
,判断数列
是否是M数列,并说明理由;
(2)若各项为正数的等比数列
的前
项和为
,且
,证明:数列
是M数列,并指出M的取值范围;
(3)设数列
,问数列
是否是M数列?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f165a34038d89623948dbe0a669df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5612ce06759d0f77ca029d10083f7d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)若等差数列
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998f5aef88cd5d583707464d3a11f187.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若各项为正数的等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f617305d7343adb94241921816b264f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de777c4e44546bcfe26ad5b6bb418052.png)
(3)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf1c8b23b5c5835f9775b1750976659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
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