2021高三·全国·专题练习
解题方法
1 . 已知等差数列{an}的前n项和为Sn,且S4=S5=-20.
(1)求数列{an}的通项公式;
(2)已知数列{bn}是以4为首项,4为公比的等比数列,若数列{an}与{bn}的公共项为am,记m由小到大构成数列{cn},求{cn}的前n项和Tn.
(1)求数列{an}的通项公式;
(2)已知数列{bn}是以4为首项,4为公比的等比数列,若数列{an}与{bn}的公共项为am,记m由小到大构成数列{cn},求{cn}的前n项和Tn.
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2 . 已知数列{an}为各项非零的等差数列,其前n项和为Sn,满足
.
(1)求数列{an}的通项公式;
(2)记
,求数列{bn}的前n项和Tn.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92094e8e4784c241c72089b93565abc5.png)
(1)求数列{an}的通项公式;
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8869767a953b3f85abb4685d7cce858.png)
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2022-01-09更新
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5卷引用:浙江省百校2021届高三下学期3月模拟联考数学试题
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2021高三·全国·专题练习
3 . 设等差数列
的前
项和为
,且
,
.
(1)求数列
的通项公式及前
项和公式;
(2)设数列
的通项公式为
,问:是否存在正整数
,使得
,
,
成等差数列?若存在,求出
和
的值;若不存在,请说明理由.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ada8fdeb1a3f36f7a906f8be54c49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5170584604571b5e1afd5ece941e2e73.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da9c93911c62cb0604be5835400d74f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773aacb94ac76cfc24d9eefb77244c56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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4 . 已知数列
的奇数项是首项为1的等差数列,偶数项是首项为2的等比数列,数列
的前n项和为
,且满足
,
.
(1)求数列
的通项公式;
(2)是否存在
,使
?若存在,求出所有符合条件的n;若不存在,说明理由.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174864c0c8cfd06f4dac7616a3219757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20d20643cd69ac1cac8b61be63a58da.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4cf5676b450dbba62764e0403e959a0.png)
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解题方法
5 . 已知正项数列
中,
,
和
分别表示
的前
项和与前
项积,从①
,②
,③
,中选取一个作为条件,解答以下问题(多选不得分).
(1)求数列
的通项公式;
(2)求数列
的前
项和
.
![](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/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.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/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca624ab6675273841ce82efea7402cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcff45e2051baeb1f4ebebc80774334c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b9700e20069ba3fa26fe1ac07437073.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3e6ff7cf0e15a8bfa8d5ea23a6d153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87bd7d18f67e90a7c37fad4252e43c9d.png)
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解题方法
6 . 数列
的前
项和
.
(1)求数列
的通项公式;
(2)求数列
的前
项和
.
![](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/5b75dbb20178da2eec9ff11a9c74e841.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e987756fedea2408cd8c8a0672c3f50.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
7 . 已知等差数列{an}的前n项和为Sn,且S5=
S2,a2n=2an+1,n∈N*.
(1)求数列{an}的通项公式;
(2)若
,令cn=an·bn,求数列{cn}的前n项和Tn.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6c4a684e08d7a47b544929c449c054.png)
(1)求数列{an}的通项公式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f322eed075dac43a3146e6aef41f0c.png)
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2022-01-06更新
|
469次组卷
|
6卷引用:安徽省安庆市示范高中2021届高三下学期4月高考模拟理科数学试题
安徽省安庆市示范高中2021届高三下学期4月高考模拟理科数学试题(已下线)第七章 数列专练9—错位相减求和(大题)-2022届高三数学一轮复习(已下线)专题04数列求和及综合应用之讲案(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04数列求和及综合应用 讲案 (理科)第一篇 热点、难点突破篇-《2022年高考数学二轮复习讲练测》(全国课标版)天津市咸水沽第一中学2022-2023学年高三上学期线上期末数学试题新疆伊犁州伊宁市新疆生产建设兵团第四师第一中学2024届高三下学期3月月考数学试题
8 . 从①
,②
,③
这三个条件中任选一个,补充在下面的问题中,并作答.
问题:已知等差数列
的前n项和为
,
,且______,求数列
的前n项和
.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09c90566c2675304f161b359d8e993f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e85e6c5e52d74dce2cef298450c139c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259b2e755105c0ee479eabf7265a76a4.png)
问题:已知等差数列
![](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/927331b3f7974c56be2a0cff0d13db94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91adba8efbf964e9e35547b0fd0ea36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
注:如果选择多个条件分别解答,按第一个解答计分.
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解题方法
9 . 已知等差数列的前n项和为
,
,
.
(1)求数列
的通项公式;
(2)若数列
满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d8e8f821111de8075e5c3dfb22a5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1aed322d5e349dacab0a9c35f810276.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e191086446263b7bbbd93613577c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65bbf3f96154f70089c49b6a32a58b26.png)
您最近一年使用:0次
名校
解题方法
10 . 已知数列
满足
,记数列
的前
项和为
,且
,
(1)求数列
的通项公式;
(2)若
,求数列
的前100项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe7bdaaf8b0adf10bf2ef6c1255b1dc.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eeb05d59ee95cc72a9f6c8672e5c2c4.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5416c230cb3a3a96670521ae3da22048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00136ab4fd69ba9c28b47cd38442dc3a.png)
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2022-01-03更新
|
1588次组卷
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5卷引用:山东2021-2022学年高三上学期12月名校大联考数学试题
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