2021·全国·模拟预测
解题方法
1 . 已知数列
满足
,
,且
,
.
(1)求数列
的通项公式;
(2)记在区间
上,
的项数为
,求数列
的前m项和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661eb98b215405edbdc6434ce55b89cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0f284bccb26dbdba7d608435ded216.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)记在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94f6846bdc60ebf071878ba84202937f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f64696f60c533ad95dc7890eb902741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f354630638001420ec7748bd5411b1.png)
您最近一年使用:0次
2021·全国·模拟预测
2 . 从①
,且
;②
,
,且存在
,
使得
,
;③若
(常数),且
,
,这三个条件中任选一个,补充在下面题目的横线中,并解答.
已知各项均为正数的数列
的前n项和为
,______.
(1)求数列
的通项公式;
(2)设
,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/055505146b770dc6eef52597e61e263b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd231d21b6e06beffecff1bf6c18896e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4db2546ebdea2f1194633c4da0bbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ac49ab7c8001c209b8611b9ea40d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6b18b109a656b62fb173680ae99ca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5369063d5b9d6587942dd8276609ad92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f653ace6f164ebcc25be5cd4d6ae7b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9832ac1fb5a728c89463e815e778c3fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed15cc9638df2d77b45716db4cef711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd231d21b6e06beffecff1bf6c18896e.png)
已知各项均为正数的数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8182f57c43fd1d8fb13161224687c469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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.
您最近一年使用:0次
2021·全国·模拟预测
3 . 数列
满足
(m,
),
,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e3e1460da36bc1dfbd4a20b309b3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e053bd54f3d3dd3e443407a49d332b82.png)
A.300 | B.330 | C.630 | D.600 |
您最近一年使用:0次
4 . 已知数列
满足
,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca749457d4cc78ce91119f51a05271f.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40f4e1236d7dc0366d9523d0cbb426be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d46e527415401665298f12bf1a5ef52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9f19b1aa8030829c75d9a3fbd0958c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca749457d4cc78ce91119f51a05271f.png)
您最近一年使用:0次
2021-05-31更新
|
1223次组卷
|
4卷引用:卓越高中千校联盟2021届高考终极押题卷文科数学试题
卓越高中千校联盟2021届高考终极押题卷文科数学试题卓越高中千校联盟2021届高考终极押题理科数学试题(已下线)考点21 数列的概念与简单表示法-备战2022年高考数学(理)一轮复习考点帮(已下线)专题7.7 数列前n项和小题(2)-2022届高三数学一轮复习精讲精练
2021·全国·模拟预测
名校
解题方法
5 . 设数列
的前
项和为
,
,
,则( )
![](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/5ecf69901899bba130968c7a091790d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d23f1ddc9ffb005a5b39f7974b6c7d06.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2021-05-29更新
|
645次组卷
|
3卷引用:普通高等学校招生全国统一考试 数学押题卷(四)
(已下线)普通高等学校招生全国统一考试 数学押题卷(四)沪教版(2020) 选修第一册 新课改一课一练 第4章 4.3.2 利用递推公式表示数列江西省全南中学2022-2023学年高二下学期期中数学试题
2021·全国·模拟预测
6 . 已知锐角
中,
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1f322806f62922efbc8127b74cbbf0.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() ![]() |
您最近一年使用:0次
解题方法
7 . 已知数列
的前
项和
,数列
满足
,则数列
的前
项和为( )
![](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/f66e0fba1165e38592fe0ffd55f427d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0def775c3d011b6af14ca6baf5de61a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
8 . 设数列
的前
项和为
,已知
,
.
(1)求数列
的通项公式;
(2)设
,数列
的前
项和为
,若
,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/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44bd85a956031e75a66b8e52d84f4ac7.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a6e6e2466cef863dd605a31c9bc2f3.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/90759c2e70d6abb3cc3e2a943b23e941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2020-12-02更新
|
839次组卷
|
2卷引用:全国3卷省区2021届11月高三大联考文科数学试题
名校
解题方法
9 . 已知数列
满足
.
(1)求数列
的通项公式;
(2)若
,则在数列
中是否存在连续的两项,使得它们与后面的某一项依原来顺序构成等差数列?若存在,请将这样的两项都探究出来;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/b2412247efe759b046e7f262f28a1b94.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff6253244b3e96a9cc1203e6f6a8913c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
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2021-01-05更新
|
743次组卷
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6卷引用:2022届高三普通高等学校招生全国统一考试 数学信息卷(五)
名校
解题方法
10 . 已知数列
的前
项和为
且满足
,下列命题中错误的是( )
![](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/9638209f2828f75fd4da3d4bade5f8f7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-11-15更新
|
1401次组卷
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5卷引用:第20练 数列的概念及其表示-2021年高考数学(文)一轮复习小题必刷
(已下线)第20练 数列的概念及其表示-2021年高考数学(文)一轮复习小题必刷(已下线)重难点01 数列-2021年高考数学【热点·重点·难点】专练(新高考)天津市滨海新区塘沽一中2020-2021学年高二上学期期末模拟卷(一)数学试题(已下线)考点10 等比数列-2022年高考数学一轮复习小题多维练(新高考版)江西省九江市同文中学2021届高三上学期期中考试数学(理)试题