2021·全国·模拟预测
名校
1 . 已知数列
满足
,
,则数列
的前2020项的和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20eec4c0b16de240e078c91716deafd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e849a6130099af1c340b853a18e1d087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.0 | B.1010 | C.2020 | D.2024 |
您最近一年使用:0次
2021-03-22更新
|
400次组卷
|
5卷引用:2021年新高考测评卷数学(第七模拟)
(已下线)2021年新高考测评卷数学(第七模拟)江苏省六校2021届高三下学期第四次适应性考试数学试题B江苏省扬州市高邮市第一中学2022届高三下学期3月质量检测数学试题安徽省阜南实验中学2022-2023学年高二下学期第一次质量检测(4月)数学试题(已下线)专题06 数列求和-2022-2023学年高二数学新教材同步配套教学讲义(苏教版2019选择性必修第一册)
2 . 设数列
的前
项和为
,已知
,
,则
等于______ .
![](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/79ebcef1b552c3dbac4b69ec9acdf580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0b39e602b1dd4915b77c08eba26be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f422edb72f7e1d5529a5570feb77df.png)
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3 . 已知数列
的各项都为正数,
,且
.
(Ⅰ)求数列
的通项公式;
(Ⅱ)设
,其中
表示不超过x的最大整数,如
,
,求数列
的前2020项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a01b542d1f3d0771f46f9df9b08c47ee.png)
(Ⅰ)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445637786ca093e49abdb0726ecc513e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a249dbf3178851a188869517fca4f9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/153bf781ede7902b281fddf52d72e18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
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2020-03-06更新
|
943次组卷
|
4卷引用:2020届河南省安阳市高三年级第一次模拟数学文科试题
2020届河南省安阳市高三年级第一次模拟数学文科试题2020届天一大联考高三年级下学期第一次模拟考试文科数学试题2020届天一大联考高三年级下学期第一次模拟考试数学(文)试题(已下线)专题08 数列-2020年高三数学(文)3-4月模拟试题汇编
4 . (本小题满分10分)
在等差数列
中,已知
.
(1)求数列
的通项公式;
(2)若________,求数列
的前n项和
.
在①
,②
,③
这三个条件中任选一个补充在第(2)问中,并对其求解.
注:如果选择多个条件分别解答,按第一个解答计分.
在等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7910fc7641682f78b45b5e5c26a863ca.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)若________,求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
在①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d81b57d696441836b63b25b2547b92d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54cb8010c98d0dd088ccfaba994dc19d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631f98c11ef576c27795bfe45c97029b.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
5 . 已知数列
的前
项和为
.
(1)求数列
的通项公式;
(2)若
,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/602085cfd91d4d3952f9eb6dd996f874.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39741978828eae72a7ba59b0bb8590db.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
2019-04-26更新
|
4791次组卷
|
8卷引用:【校级联考】四川省华文大教育联盟2019届高三第二次质量检测数学(文)试题
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6 . 设正项数列
的前
项和
满足
,
,且
,
,
成等比数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99805018d263b9f03d7c80dd822a88dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cf859a33e5eb27516583745bbc1aa.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/19a4126c4e03ee3d98052cf52ff58e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933b7c3ace69622339353431c519b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46be9c9b05fd84ac9256d49a5a553af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99805018d263b9f03d7c80dd822a88dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cf859a33e5eb27516583745bbc1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864407581c21ab7f30b63d1247201783.png)
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7 . 过曲线
上的一点
作曲线的切线,交x轴于点P1,过P1作垂直于x轴的直线交曲线于Q1,过Q1作曲线的切线,交x轴于点P2;过P2作垂直于x轴的直线交曲线于Q2,过Q2作曲线的切线,交x轴于点P3;……如此继续下去得到点列:
设
的横坐标为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162c9e7170296f7bd4241dc11251ed5b.png)
(I)试用n表示
;
(II)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c007102636df74283fcacd042dfb9d9.png)
(III)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4786ff384829d0ba235c689dfa494e3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50b3a5cb99d3faf06ceed2ef3880c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f087469e06e5a5d26eaa8fce7310e569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/162c9e7170296f7bd4241dc11251ed5b.png)
(I)试用n表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
(II)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c007102636df74283fcacd042dfb9d9.png)
(III)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/530e4880bf63322822d3cad9e8e50dbe.png)
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