解题方法
1 . 在钝角
中,三个内角为A,B,C,满足
.
(1)证明:
是等腰三角形;
(2)若延长
至D点,使得
,且
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c7cfa8af7b3ed2577c53b6ca8965b50.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35333abd7f02d663d15251bc5cbbf921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2520e34084c7686762c476b60015b28.png)
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名校
2 . 设非常数数列
满足
,
,其中常数
,
均为非零实数,且
.
(1)证明:数列
为等差数列的充要条件是
;
(2)已知
,
,
,
,求证:数列
与数列
中没有相同数值的项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d716659722cbc0132626ceab9b404e0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3cd71690942ef82b8dc04580efc93a.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcebe948fb198d4fde0df1a1abe680bc.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0733e8dfacbad67bdb7c26930acddaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234dd79e0081ba0ebd0f7cd4d7d5bef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6d8a8a57db1c2fc7f465d2cfd2aa78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81e4c91a371984fd3d13330c902b07b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bc279fef6843dddded8abfa0fbe63e.png)
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2021-06-08更新
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791次组卷
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6卷引用:江苏省南京师范大学《数学之友》2021届高三下学期二模数学试题
江苏省南京师范大学《数学之友》2021届高三下学期二模数学试题(已下线)卷09 高二上学期12月阶段测-【重难点突破】2021-2022学年高二数学上册常考题专练(人教A版2019选择性必修第一册)(已下线)第17题 数列解答题的两大主题:通项与求和-2021年高考数学真题逐题揭秘与以例及类(新高考全国Ⅰ卷)(已下线)专题08 数列-备战2022年高考数学(文)母题题源解密(全国乙卷)(已下线)查补易混易错点04 数列-【查漏补缺】2022年高考数学三轮冲刺过关(新高考专用)江苏省苏州市吴江区震泽中学2022-2023学年高二10月月考数学试题
名校
3 . 已知数列{an}满足
,
,
,
成等差数列.
(1)证明:数列
是等比数列,并求{an}的通项公式;
(2)记{an}的前n项和为Sn,.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2f6482fd06dce71fb40b2b26c33b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c8c0c5f13962a0d47db3cfd4f6dff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604fbee0544dc18d9b15d5243dad9f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62bae11b31f657478e97646895a289e3.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213e22890204937a5dded4436369390f.png)
(2)记{an}的前n项和为Sn,.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/253f760453e929f718cc63b8617189ac.png)
您最近一年使用:0次
2021-06-08更新
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1479次组卷
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4卷引用:浙江省金华市2021届高三下学期5月高考仿真模拟数学试题
浙江省金华市2021届高三下学期5月高考仿真模拟数学试题(已下线)专题03 《数列》中的压轴题-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)(已下线)2020年高考浙江数学高考真题变式题17-22题辽宁省大连市育明高级中学2023-2024学年高三上学期期中数学试题
名校
解题方法
4 . 已知各项均为正数的数列
满足
,且
,
.
(1)证明:数列
是等差数列;
(2)数列
的前项
和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d29e031a71bccfd9e6a7635cb4ca29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8e8f821111de8075e5c3dfb22a5d6.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c133f850a40f4d23c30fa91a1e7d74a2.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d3e6e16ea5dcb69dda60cacc4cfd2c.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/5737f1f9cad2471f3ca53241b25a1eb9.png)
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9卷引用:东北两校(大庆实验中学、吉林一中)2021届高三4月联合模拟考试数学(理)试题
东北两校(大庆实验中学、吉林一中)2021届高三4月联合模拟考试数学(理)试题(已下线)专题28等差数列通项与前n项和-2022年(新高考)数学高频考点+重点题型(已下线)专题08 数列-2021年高考真题和模拟题数学(理)专项汇编(全国通用)(已下线)专题7.2 等差数列及其前n项和(练)- 2022年高考数学一轮复习讲练测(新教材新高考)(已下线)专题19 数列-备战2022年高考数学(理)母题题源解密(全国乙卷)(已下线)专题14 盘点数列的前n项和问题——备战2022年高考数学二轮复习常考点专题突破(已下线)专题01 盘点求数列前n项和的五种方法-2安徽省阜南实验中学2022-2023学年高二下学期5月月考数学试题(已下线)专题29 等差数列通项与前n项和
5 . 已知数列
满足
,且
.
(1)证明:数列
为等比数列;
(2)记
,
是数列
前n项的和,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3369ae2337f8d6a049fd8e5a9f313f87.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13430afc40fc85c8bb5b69065f878acf.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d865bfb7827bb824fc429ea9adf32722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf4cea13f3c0a934a3be5a3d834774f.png)
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6 . 已知数列
中,
,其前
项的和为
,且满足
.
(1)求证:数列
是等差数列;
(2)证明:当
时,
;
(3)证明:当
时,
.
![](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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d69b163e93d493e624e1ee5c69f67c.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1038e8e4038f239ca4fde1fac2a6e946.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc5735838e43b7a229e8f45c9bfffb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d7365e01bdb34e7f78fd1f5c0056e2.png)
(3)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bc5735838e43b7a229e8f45c9bfffb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88068328bbc7100896df76475d995246.png)
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名校
解题方法
7 . 已知数列
的前n项和为
,
.
(1)求证:
是等比数列;
(2)证明:
.
![](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/b76f19e8882f9c442ce994986ed9ceb5.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f86e5aaea193d51fa06c58abb3898b.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565115bbf3ea89ec18629e3be6111628.png)
您最近一年使用:0次
2021-05-13更新
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369次组卷
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3卷引用:宁夏回族自治区石嘴山市2021届高三二模数学(理)试题
8 . 已知数列
满足
,
,
,
.
(Ⅰ)求证:数列
为等差数列;
(Ⅱ)设数列
的前
项和
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42162d21f041e1fa9df1f583d80a2ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac69e6db1df13ed64756b4f391ae9fac.png)
(Ⅰ)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0cab513667aaae70e590ba73efff7dc.png)
(Ⅱ)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b2286a94a516e6a2fb45329a772fd4.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/e8695875aded32578fcc9a86177b1ea6.png)
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2021-05-12更新
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4卷引用:安徽省安庆市2021届高三下学期二模理科数学试题
9 . 若有穷数列
满足
且对任意的
,
至少有一个是数列
中的项,则称数列
具有性质![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)判断数列1,2,4,8是否具有性质P,并说明理由;
(2)设项数为
的数列
具有性质
,求证:
;
(3)若项数为
的数列
具有性质
,写出一个当
时,
不是等差数列的例子,并证明当
时,数列
是等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b96f565b4ca625ab41a782e3dfd0f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0492686dc1959ba361d9b2832491620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e72ad2e72453867d089770c3f4c63da.png)
![](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/dad2a36927223bd70f426ba06aea4b45.png)
(1)判断数列1,2,4,8是否具有性质P,并说明理由;
(2)设项数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3411ddca520e2bcb516d0c5c0832aeb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee349b3f104aa5a5e03830a205570f3.png)
(3)若项数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3411ddca520e2bcb516d0c5c0832aeb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcbd5bb726a08c308b48373afebbb768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0266e0e890fb1b84be352fdc65bb298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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2020-12-25更新
|
587次组卷
|
6卷引用:上海市嘉定区2021届高三上学期一模数学试题
上海市嘉定区2021届高三上学期一模数学试题(已下线)专题05 《数列》中的解答题压轴题(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)(已下线)重难点01 数列(基本通项求法)-2021年高考数学【热点·重点·难点】专练(上海专用)(已下线)考向17 数列新定义-备战2022年高考数学一轮复习考点微专题(上海专用)北京市第五十五中学2022-2023年高二下学期3月调研数学试题(已下线)上海高二下学期期末真题精选(压轴60题35个考点专练)-【满分全攻略】2022-2023学年高二数学下学期核心考点+重难点讲练与测试(沪教版2020选修一+选修二)
名校
解题方法
10 . 已知等比数列
的公比
,且
,
,
是公差为
的等差数列
的前3项.
(1)求
的最小值;
(2)在
取最小值的条件下,设
,数列
的前
项和为
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.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/fc17ca3ab612ea9cf6cfa1eea53cb1eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450bfba8c76f5957e945026cbd235298.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450bfba8c76f5957e945026cbd235298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f672010fe85e005afba869d1c50e27.png)
![](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/2e8aef2efae0e76650c8463d80f69a14.png)
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2024-01-13更新
|
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|
2卷引用:湖南省长沙市宁乡市第一高级中学2021届高三第三次模拟考试数学试卷