名校
解题方法
1 . 设数列
的各项均为正数,前
项和为
,已知
.
(1)证明数列
是等差数列,并求其通项公式;
(2)若
、
、…、
都在函数
的图像上,设数列
的前
项和为
,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/ee375a1ee9eaddfc2116c858e290fd39.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3303ca12f8486476cca1a38f7aa7174e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabb2b69d96b59dd01995bd1776404c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a170f259987c326ae29e2b1b066cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d018d0b5d1970404a82d6dc0d5e1771c.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ebd50da51d34f86229b9b71e8e9701.png)
您最近一年使用:0次
名校
2 . 已知无穷数列满足
,其中p,q均为非负实数且不同时为0.
(1)若
,
,且
,求
的值;
(2)若
,
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d6c0713ed7f57f82f972bd09844e17.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f970f380a12c843bb4a74ff34a15b2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d9b6c86435e0ceff94d8ad1cd03737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98d10092efc21e76783c0cd5fb5ad38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6065aaa8f3f103d1bc960da8318ce35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085b7f021a79ec95dac1f7b56769774e.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)
您最近一年使用:0次
名校
解题方法
3 . 为了加强环保建设,提高社会效益和经济效益,某市计划用若干时间更换万辆燃油型公交车.每更换一辆新车,就淘汰一辆旧车,更换的新车为电力型车和混合动力型车今年初投入了电力型公交车128辆,混合动力型公交车400辆,计划以后电力型车每年的投入量比上一年增加50%,混合动力型车每年比上一年多投入
辆.设
,
分别为从今年起
年里投入的电力型公交车、混合动力型公交车的总数量.
(1)求
,
,并求从今年起
年里投入的所有新公交车的总数量
;
(2)该市计划用7年的时间完成全部更换,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e9da2b0e7b9eca965043be2f38a91f1.png)
(2)该市计划用7年的时间完成全部更换,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2021-09-23更新
|
1264次组卷
|
11卷引用:上海市川沙中学2018-2019学年高一第二学期期末数学试题
上海市川沙中学2018-2019学年高一第二学期期末数学试题2015届湖南省长望浏宁四县高三3月调研(一模)考试理科数学试卷2015届上海市奉贤区高三上学期期末调研测试数学试卷人教A版(2019) 选修第二册 突围者 第四章 全章综合检测苏教版(2019) 选修第一册 突围者 第4章 全章综合检测上海市晋元高级中学2018-2019学年高二上学期期中数学试题江苏省苏州市常熟中学2021-2022学年高二上学期10月阶段学习质量检测数学试题北师大版(2019) 选修第二册 突围者 第一章 数列 全章综合检测江苏省苏州市高新区第一中学2021-2022学年高二上学期期中模拟数学试题人教A版(2019) 选修第二册 实战演练 第四章 数列 验收检测(已下线)第4章 数列(单元测试)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)
名校
解题方法
4 . 已知数列
的首项为
,前n顶和为
.
(1)若
,求数列
的通项公式;
(2)在(1)的条件下,是否存在
,使得对任意
,恒有
(其中k是与正整数n无关的常数),若存在,求出x与k的值,若不存在,说明理由;
(3)若
是无穷等比数列,且公比
,计算
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f09ca5eff8906033c594ffb09e79c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738dab1f14034922a2a99f39aa34a705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)在(1)的条件下,是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f09ca5eff8906033c594ffb09e79c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98f2665d0eff0773a766e36274ec4a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a3527ddfb825cc34e68cd1bac9a272a.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354efd9145bb3bd889cf0eaadbcc55f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f954f9cda2ebfcbb4caf81f2429eeed.png)
您最近一年使用:0次
名校
5 . 据相关数据统计,2019年底全国已开通5G基站13万个,部分省市的政府工作报告将“推进5G通信网络建设”列入2020年的重点工作,2020年一月份全国共建基站3万个.
(1)如果从2020年2月份起,以后的每个月比上一个月多建设2000个,那么,到2020年底全国共有基站多少万个(精确到0.1万个);
(2)如果2020年新建基站60万个,计划到2022年底全国至少要800万个,并且,从2021年起每年新建基站的数量比上一年以等比严格递增,间2021年和2022年至少各建多少万个才能完成计划?(精确到1万个)
(1)如果从2020年2月份起,以后的每个月比上一个月多建设2000个,那么,到2020年底全国共有基站多少万个(精确到0.1万个);
(2)如果2020年新建基站60万个,计划到2022年底全国至少要800万个,并且,从2021年起每年新建基站的数量比上一年以等比严格递增,间2021年和2022年至少各建多少万个才能完成计划?(精确到1万个)
您最近一年使用:0次
6 . 在等差数列
中,
,且
.
(1)求
的通项公式;
(2)若
,证明:数列
为等比数列,并求其前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9872184eced44ea3064e57ce88db64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8c45e4c4ab30665338dd87a2258f23.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/486ea3196d88a98cb445b37ac5befb1a.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/08eb71ecf8d733b6932f4680874dbbf3.png)
您最近一年使用:0次
2021-07-10更新
|
363次组卷
|
7卷引用:上海市华东师范大学附属东昌中学2023-2024学年高二上学期10月月考数学试题
上海市华东师范大学附属东昌中学2023-2024学年高二上学期10月月考数学试题上海市东昌中学2023-2024学年高二上学期10月月考数学试题陕西省商洛市2020-2021学年高二下学期期末文科数学试题河南省2020-2021学年高二下学期期末数学(文科)试题沪教版(2020) 选修第一册 新课改一课一练 第4章 单元复习上海市复旦实验中学2021-2022学年高二下学期期末数学试题(已下线)4.2 等比数列的前n项和(第2课时)(作业)(夯实基础+能力提升)-【教材配套课件+作业】2022-2023学年高二数学精品教学课件(沪教版2020选择性必修第一册)
7 . 已知无穷实数列
,
,若存在
,使得对任意
,
恒成立,则称
为有界数列;记
,若存在
,使得对任意
,
恒成立,则称
为有界变差数列.
(1)已知无穷数列
的通项公式为
,判断
是否为有界数列,是否为有界变差数列,并说明理由;
(2)已知首项为
,公比为实数
的等比数列
为有界变差数列,求
的取值范围;
(3)已知两个单调递增的无穷数列
和
都为有界数列,记
,
,证明:数列
为有界变差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2480f87a11c4cd450bc9454ea7276722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3020838d53c5cf3e3ef3c323917ba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f49b4e00ea2c0bb4200795de17d426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094f977194228bed828f3507f5898934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c7aab4df25884973273efae244f2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5ba7e16abbfc05737699584023d4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(1)已知无穷数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a026996f510aa79d5b308885a5b4dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)已知首项为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e1ee88beaddafb0d0a185c3a8e0dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c88a7ef007c78a93e33bd77c4396626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
(3)已知两个单调递增的无穷数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11913c4302df9c8bdd8b14a3ac576943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fc3cb687d9d078378225ac8afb8d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e2140897e37d90c061140af7689598e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b97a949a7c7ac1cbeabee638299eb62.png)
您最近一年使用:0次
8 . 已知等差数列
中,第2项为6,前5项和为45.
(1)求
通项公式;
(2)若
,求
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e14eedc2934191808096c1808ca29f21.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
9 . 定义:对于一个项数为
的数列
,若存在
且
,使得数列
的前
项和与剩下项的和相等(若仅为1项,则和为该项本身),我们称该数列是“等和数列”例如:因为3=2+1,所以数列3,2,1是“等和数列”.请解答以下问题:
(1)数列
是“等和数列”,求实数
的值;
(2)设数列
通项公式为
,且共有
项,证明:
不是等和数列;
(3)项数为
的等差数列
的前
项和为
,求证:
是“等和数列”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdcd07be0a24101e784b628d46ec90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b6d151d3f864bae873987f6db9327a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfae43a1ea1f5f3a031d224ac61a5f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(1)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2c6eaa1e1c1f4c85e35b46e30b7c70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b933d363f5b85a6b4110c9ef030c56a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(3)项数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378397148dc9a98bb9109154a551ced5.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/f899bd706e363ec439acbd0bea356209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
10 . 设
是无穷正项等比数列,公比为
.对于正整数集
的子集
,若
,定义
;若
,定义
.
(1)若
,
,
,求
;
(2)设
.若
、
是
的非空有限子集且
,求证:
;
(3)若对
的任意非空有限子集
、
,只要
,就有
,求公比
的取值范围.
![](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/52866a74e4af867ceea0efb1ad06602c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2107216f6f7f012fd631c5da84365b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbbcfe1c221cbfee862634526d6c1f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e745fd938663191ae254f18b979afc3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c17e4e98aa1080cf1752257a113af45.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f45f5bc7c648c0e8924b4fa7b1ad08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799a57bb07e4d32501018027843b7d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf414809032abdd0d6b259228275757.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4099a6a331e90aa8b7fdd3c113673896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52866a74e4af867ceea0efb1ad06602c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65b558a0445c59c83fa28d9ca0f37.png)
(3)若对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52866a74e4af867ceea0efb1ad06602c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3675d10cb915e25bf349649b2e20e08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cfaafb17097504a9bdd0317a0ecabe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
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