解题方法
1 . 已知数列
的前
项和为
,
,且对任意的正整数
,都有
,其中常数
,设
﹒
(1)若
,求数列
的通项公式;
(2)若
且
,设
,证明数列
是等比数列;
(3)若对任意的正整数
,都有
,求实数
的取值范围.
![](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/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f22775ad89d7416600e95bfb9adab8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be362dec96173f246ff747264007817.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9602698da3c63cde3cbe181dfeffedd6.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdfec4233214c3a729c843dee0d186db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472393b18c7880e73b40e31fbe2d951c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb740a80a7c2dd4b46c5cec0ac99db72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fd2b8c75dd19915dde8e4e5618a8e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
(3)若对任意的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174f51642357c7de6c2e7c0211299baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2020-08-12更新
|
115次组卷
|
5卷引用:2016届江苏省苏锡常镇四市高三教学情况调研二数学试卷
2016届江苏省苏锡常镇四市高三教学情况调研二数学试卷江苏省“丹靖沭”优秀学生培育联谊校2019-2020学年高三上学期10月份联考数学试题(已下线)专题6.5 数列的综合问题(讲)-江苏版《2020年高考一轮复习讲练测》(已下线)2.5等比数列的前n项和(1) -2020-2021学年高二 数学课时同步练(人教A版必修5)(已下线)4.3.2 等比数列的前n项和(1)-2020-2021学年高二数学课时同步练(人教A版选择性必修第二册)
名校
解题方法
2 . 在
中,角
、
、
所对的边分别为
、
、
,若
为锐角三角形,且满足
,则
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b269069e460c7ab1d90ee9bac7bd876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88050fbeab0faab61d7d36ff148c6cb1.png)
您最近一年使用:0次
2020-03-21更新
|
1483次组卷
|
16卷引用:2016届江苏盐城三模数学试卷
2016届江苏盐城三模数学试卷江苏省启东中学2017-2018学年高一下学期第一次月考数学试题【全国区级联考】江苏省扬州市邗江区2017-2018学年高一下学期期中考试数学试题(已下线)2017-2018学年度下学期高一数学期末备考总动员C卷2018年高考考前猜题卷之大数据猜题卷理科数学试题广东省深圳市红岭中学2020届高三上学期第二次统一考试数学(理)试题四川省泸州市泸县第一中学2019-2020学年高一下学期第二次月考数学试题四川省成都市彭州中学2018-2019学年高一下学期3月月考数学(理)试题四川省成都市彭州中学2018-2019学年高一下学期3月月考数学(文)试题(已下线)专题11 三角形中的三角问题的探究-2021年高考数学二轮优化提升专题训练(新高考地区专用)【学科网名师堂】(已下线)6.4.3 第1课时 余弦定理(练习)-2020-2021学年下学期高一数学同步精品课堂(新教材人教版必修第二册)(已下线)考点突破05 三角函数-备战2022年高考数学一轮复习培优提升精炼(新高考地区专用)上海市奉贤区2020-2021学年高一下学期调研数学试题吉林省长春实验中学2020-2021学年高二上学期开学考试数学试题安徽省滁州市凤阳县临淮中学2022届高三下学期四模文科数学试题山东省日照神州天立高级中学2023-2024学年高三上学期期中模拟考试2数学试题
名校
解题方法
3 . 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:2016届江苏省南京市高三第三次模拟考试数学试卷
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
4 . (文)市场上有一种新型的强力洗衣液,特点是去污速度快,已知每投放![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
个单位的洗衣液在一定量水的洗衣机中,它在水中释放的浓度
(克/升)随着时间
(分钟)变化的函数关系式近似为
,其中
,若多次投放,则某一时刻水中的洗衣液浓度为每次投放的洗衣液在相应时刻所释放的浓度之和,根据经验,当水中洗衣液的浓度不低于4(克/升)时,它才能起到有效去污的作用.
(1)若只投放一次4个单位的洗衣液,则有效去污时间可达几分钟?
(2)若第一次投放2个单位的洗衣液,6分钟后再投放2个单位的洗衣液,问能否使接下来的4分钟内持续有效去污?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af923faaf3ae5f5b6c29070bb9952076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92dad40263fc3a1bb171af5b27ebf75b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e247d1c8d645f218870b5d1d7e0eef92.png)
(1)若只投放一次4个单位的洗衣液,则有效去污时间可达几分钟?
(2)若第一次投放2个单位的洗衣液,6分钟后再投放2个单位的洗衣液,问能否使接下来的4分钟内持续有效去污?说明理由.
您最近一年使用:0次
2020-02-29更新
|
1048次组卷
|
6卷引用:2015-2016学年江苏省泰兴中学高二下学期期中数学(文)试卷
5 . 已知非零数列
满足
,
.
(1)求证:数列
是等比数列;
(2)若关于
的不等式
有解,求整数
的最小值;
(3)在数列
中,是否存在首项、第
项、第
项(
),使得这三项依次构成等差数列?若存在,求出所有的
;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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/453f8c230ec9bdc197459bae57b15b9e.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5971cda748462d6125bb222e69e88a0.png)
(2)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839b44ce39b1a7705fa8f87c1d6bfd3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4231521442fed6c58d744276281ed52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5b266f565d738a9ac15199eb82206f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4224b6c936b438df381a89eda0accf89.png)
您最近一年使用:0次
2020-02-04更新
|
465次组卷
|
5卷引用:2016届江苏省南通市石庄高中高三上第三次调研文科数学试卷
名校
6 . 设数列
共有
项,记该数列前
项
,
,…,
中的最大项为
,该数列后
项
,
,…,
中的最小项为
,
(
1,2,3,…,
).
(1)若数列
的通项公式为
,求数列
的通项公式;
(2)若数列
是单调数列,且满足
,
,求数列
的通项公式;
(3)试构造一个数列
,满足
,其中
是公差不为零的等差数列,
是等比数列,使得对于任意给定的正整数
,数列
都是单调递增的,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32242e0f13757d9272dbb9b2dde59396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e819b87f90651d89fcd258c276294e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27fe0a0139387ac29a3a22de8a694414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b8d5b6045219ea4527202ab131bb2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1474a7ff515722319205a132a75562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681ae1522a36768618f7ddaf74abbb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc5c895153932c3e827a464664cef90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de95d944c903a631eb5ebcacff45f19c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b1e185d6a0ab350cdc947beeb82040.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1e94f660b7d05de4be4b5fbd9041f4.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4b5779873cb3f4366dbfdb983dec81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4691fe03867d254e5bb77da216660271.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e15e7894710bc5a7b936ebf9e78cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(3)试构造一个数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb2db37e079b735acc41ea3035139e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4691fe03867d254e5bb77da216660271.png)
您最近一年使用:0次
2020-02-03更新
|
218次组卷
|
7卷引用:2016届江苏省南京市、盐城市高三第一次模拟考试数学试卷
2016届江苏省南京市、盐城市高三第一次模拟考试数学试卷(已下线)2018年高考二轮复习测试专项【苏教版】专题五 数列(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2016届上海市高考压轴数学试题(已下线)4.3.1-4.3.2 等比数列的概念和通项公式-2022-2023学年高二数学《基础·重点·难点 》全面题型高分突破(苏教版2019选择性必修第一册)2017届上海市复旦大学附属中学高三毕业考试数学试题(已下线)4.3.1.2 等比数列的性质及应用(练习)-2022-2023学年高二数学同步精品课堂(人教A版2019选择性必修第二册)
7 . 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)
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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
10-11高三·广东·阶段练习
名校
8 . 已知等差数列
的公差为-1,且
.
(1)求数列
的通项公式
与前n项和
;
(2)若将数列
的前4项抽去其中一项后,剩下三项按原来顺序恰为等比数列
的前3项,记
的前n项和为
.若对任意m,n∈
,都有
恒成立,求实数λ的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d28c990e85d87e43205472a0b0374b3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)若将数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52866a74e4af867ceea0efb1ad06602c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f39dda82ddb90816e61b67fd52367fef.png)
您最近一年使用:0次
2020-01-07更新
|
278次组卷
|
15卷引用:2015-2016学年江苏省泰州、靖江中学高一下期中数学试卷
2015-2016学年江苏省泰州、靖江中学高一下期中数学试卷(已下线)2011届广东省执信中学中学高三2月月考数学文卷(已下线)2012届浙江省台州中学高三上学期期中考试文科数学试卷2015届湖北省武汉华中师大附中高三5月考试理科数学试卷2016届河北省衡水中学高三上学期四调理科数学试卷重庆市育才中学2014-2015学年高一下学期期中数学(文)试题浙江省绍兴市柯桥中学2019-2020学年高二下学期期中数学试题(已下线)解密03 等差数列与等比数列(分层训练)-【高频考点解密】2021年新高考数学二轮复习讲义+分层训练(已下线)解密03 等差数列与等比数列(讲义)-【高频考点解密】2021年新高考数学二轮复习讲义+分层训练(已下线)专题03等差数列等比数列之测案(文科)第一篇 热点、难点突破篇-《2022年高考文科数学二轮复习讲练测》(全国课标版)(已下线)专题03等差数列等比数列之测案(理科)第一篇 热点、难点突破篇-《2022年高考理科数学二轮复习讲练测》(全国课标版)河南省三门峡市2022-2023学年高三上学期11月月考数学文科试题陕西省渭南市韩城市新蕾中学2021-2022学年高三上学期期中文科数学试题陕西省渭南市韩城市新蕾中学2021-2022学年高三上学期期中理科数学试题河南省三门峡市2022-2023学年高三上学期11月阶段性考试数学(理)试题
名校
9 . 各项均为正数的数列
的前n项和为
,且满足
.各项均为正数的等比数列
满足
.
(1)求证
为等差数列并求数列
、
的通项公式;
(2)若
,数列
的前n项和
.
①求
;
②若对任意
,均有
恒成立,求实数m的取值范围.
![](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/8ffa75b32ffcada8c93c9172084886ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e3a41960ad8e095e15236756f68ceb.png)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b963592890b4edb989e4729ec062b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
②若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c7aab4df25884973273efae244f2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd76af3e50a34c849cc3d6c4011aff95.png)
您最近一年使用:0次
2019-11-30更新
|
1889次组卷
|
7卷引用:2015-2016学年江苏省南京市玄武区高一下学期期中考试数学试卷
名校
10 . 已知数列{an}的前n项和为Sn,
,Sn=n2an-n(n-1),n=1,2,…
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
(1)证明:数列{Sn}是等差数列,并求Sn;
(2)设,求证 :b1+b2+…+bn<1.
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