解题方法
1 . 已知
,
.
(1)求证:
;
(2)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9199b47c03db11c9bea45ff151372aa.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/676a377807e51b8719824d8258eeac6c.png)
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2 . 已知数列
的前
项和
满足
;数列
满足
,
.
(1)求数列
、
的通项公式;
(2)记数列
,
,求
;
(3)记数列
,求证:
.
![](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/63a26aa4cbbc507eb4743d9c52a94f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899b5b468b1ace24886e6ca71208044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98e33911a29dc2d64ce12b6a573fcfa.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)记数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97a1388157e9ea8bf4305dac1b641c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7399fcd570d1de4057f2059759d18cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/724a55bc6fbee2312645791c8b36408a.png)
(3)记数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/941297f31a6531c8b34b63d4bb306427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f909a8b6205c03c52b07f19376721b.png)
您最近一年使用:0次
3 . 已知
是等比数列,
是等差数列,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb9ca05d325ed018f5aaad5d75a3d61.png)
(1)求
和
的通项公式;
(2)将
和
中的所有项按从小到大的顺序排列组成新数列
,求数列
的前
项和
;
(3)设数列
的通项公式为:
,
,求
.
![](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/c24eb7268bad85453208b1a0fa869418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb9ca05d325ed018f5aaad5d75a3d61.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cc1e7a87da7751da31f851ae6d46aff.png)
(3)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90002cba13465275d1bd17b629548c4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f29c06a3e9a73e905eb87d71efa201c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ecc554fa88de158f1932b874c90765d.png)
您最近一年使用:0次
名校
解题方法
4 . 已知数列
的前n项和为
,
,
,
(
且
)
(1)求数列
的通项公式;
(2)令
,求数列
的前n项和
.
(3)设
,
,其中
,求
.
![](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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd67791e11bf12e41449eed1781e2f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e91f5915e62b151b18156b548e97ce34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3203575dca7e5d3233f8e3b5f0d22669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4f301232123cb7732d4dfacbd1fcab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7399fcd570d1de4057f2059759d18cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa104c781e026ca07a0378a37981a79.png)
您最近一年使用:0次
名校
5 . 正整数数列中,由1开始依次按如下规则,将某些整数染成红色.先染1;再染3个偶数2,4,6;再染6后面最邻近的5个连续奇数7,9,11,13,15;再染15后面最邻近的7个连续偶数16,18,20,22,24,26,28;再染此后最邻近的9个连续奇数29,31,…,45;按此规则一直染下去,得到一红色子数列:1,2,4,6,7,9,11,13,15,16,……,则在这个红色子数列中,由1开始的第2021个数是( )
A.3991 | B.3993 | C.3994 | D.3997 |
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2023-01-05更新
|
533次组卷
|
3卷引用:天津市咸水沽第一中学2022-2023学年高二上学期期末数学试题
6 . 已知数列
是等差数列,其前n项和公式为
,数列
是等比数列
,
,
,
.
(1)求数列
和
的通项公式;
(2)令
,求数列
的前n项和
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3970764ee88225c452c40de226eafcbc.png)
(3)令
,求数列
的前n项和
;
![](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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6347170e120865f690485dc77d227ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b478c8d7a765b4ec9218f68ac24531.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4dfec7297c966dd8666301ae9fec6e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3970764ee88225c452c40de226eafcbc.png)
(3)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74898ff2fe4d09546e53565c1c6cf553.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
名校
7 . 已知正数
满足
,则
的最小值是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/431657d0c484c120bdc70c056077a735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f29d5f376c75c41ae6af0c8a8565449.png)
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2022-12-29更新
|
2037次组卷
|
5卷引用:天津市耀华中学2022-2023学年高三上学期第三次月考数学试题
天津市耀华中学2022-2023学年高三上学期第三次月考数学试题2023届天津市普通高考数学模拟卷(三)天津市南开中学2023届高三统练24数学试题(已下线)专题5-1 均值不等式及其应用归类(讲+练)-3(已下线)专题03 均值不等式及其应用 (2)
8 . 已知数列
为等差数列,数列
为等比数列,且
,
,
,
.
(1)求
,
的通项公式.
(2)已知
,求数列
的前2n项和
.
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0d29f34218cd60cc6e9ce4dcd13925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f81b63fc0cffb75cc6aeae64591277c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a72a928a6bcde50c7e502669880892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78c72dc9034f1aca2b4ef5afb4475c66.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd37f8bb8b52db13ba5c48b878de23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd85b79372dc6e596d465f738c3c300.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f5e7f98ec8f4ea9b9492405094c5380.png)
您最近一年使用:0次
2022-12-15更新
|
1747次组卷
|
6卷引用:天津市静海区第一中学2022-2023学年高三上学期12月月考数学试题
名校
解题方法
9 . 已知正实数a,b满足
,则
的最小值为___________ .
的最小值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66a894fe1c8dddb41d9e4885e979a5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c36723680999121c79ad8ee75d2b7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b098834e9a4a77cb48ffcaa17858a8.png)
您最近一年使用:0次
2022-12-15更新
|
1012次组卷
|
3卷引用:天津市静海区第一中学2022-2023学年高三上学期12月月考数学试题
名校
解题方法
10 . 等差数列
的前
项和为
,且
.数列
的前
项和为
,且
(
为常数).
(1)求数列
的通项公式;
(2)数列
满足
,求
.
![](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/cc3627e4bff803df47d958c49bf3e879.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/8ab3b3f344d4cb9694349e0100067986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e567d7e9761951a266953c8d5042ac.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274003a50122398bc071b6794587a723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5249095e0c2a28875a40a5d9c2c56bac.png)
您最近一年使用:0次