名校
1 . 在一个有穷数列的每相邻两项之间插入这两项的和,形成新的数列,我们把这样的操作称为该数列的一次“Z拓展”.如数列1,2第1次“Z拓展”后得到数列1,3,2,第2次“Z拓展”后得到数列1,4,3,5,2.设数列a,b,c经过第n次“Z拓展”后所得数列的项数记为Pn,所有项的和记为Sn.
(1)求P1,P2;
(2)若Pn≥2020,求n的最小值;
(3)是否存在实数a,b,c,使得数列{Sn}为等比数列?若存在,求a,b,c满足的条件;若不存在,说明理由.
(1)求P1,P2;
(2)若Pn≥2020,求n的最小值;
(3)是否存在实数a,b,c,使得数列{Sn}为等比数列?若存在,求a,b,c满足的条件;若不存在,说明理由.
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2020-05-11更新
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484次组卷
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4卷引用:重庆市渝北区、合川区、江北区等七区2019-2020学年高二下学期期末联考数学试题
重庆市渝北区、合川区、江北区等七区2019-2020学年高二下学期期末联考数学试题2020届北京市房山区高三第一次模拟考试数学试题(已下线)专题21 数列的综合应用-2020年高考数学母题题源解密(北京专版)北京市育才学校2023-2024学年高三上学期期中测试数学试卷
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解题方法
2 . 将
个正实数排成
行
列(例:
表示第4行,第2列的数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec4c985594729aab68cbd2766ad363f.png)
其中每一行的数成等差数列,每一列的数成等比数列,并且所有的公比相等,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f2ff885bcc411964ef7e2a95c88ca78.png)
求公比![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
____ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed24c32765ea4c560ca323ad8d979104.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dcff466eba4556626dcfdc09d4d480f.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/4b6e6eaef3556ecc5bad7f9d41a00fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec4c985594729aab68cbd2766ad363f.png)
其中每一行的数成等差数列,每一列的数成等比数列,并且所有的公比相等,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f2ff885bcc411964ef7e2a95c88ca78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0286255f6812e2cde27e264a9de487c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed24c32765ea4c560ca323ad8d979104.png)
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3 . 若存在无穷数列
,
满足:对于任意
,
是方程
的两根,且
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca5534adfc08c096107161b2f7d0e12.png)
___________ .
![](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/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31260d89270621bc4aeb4cb06cd9b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a26c1e0787fcc0536decf4a14558e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/287d1cf8d37a30e2cf890fb4cce63d0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d765033fa3e470b4b4bae90a28514587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca5534adfc08c096107161b2f7d0e12.png)
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2020-04-20更新
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400次组卷
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3卷引用:重庆市缙云教育联盟2022-2023学年高二下学期期末数学试题
重庆市缙云教育联盟2022-2023学年高二下学期期末数学试题(已下线)专题01 数列(6大考点经典基础练+优选提升练)-【好题汇编】备战2023-2024学年高二数学下学期期末真题分类汇编(新高考专用)浙江省名校新高考研究联盟(Z20联盟)2018-2019学年高三下学期第三次联考数学试题
4 . 下图1,是某设计员为一种商品设计的平面logo样式.主体是由内而外的三个正方形构成.该图的设计构思如图2,中间正方形
的四个顶点,分别在最外围正方形ABCD的边上,且分所在边为a,b两段.设中间阴影部分的面积为
,最内正方形
的面积为
.当
,且
取最大值时,定型该logo的最终样式,则此时a,b的取值分别为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd3f77655b36695ebcdd96691c21b63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33189281d8ad24b3ed4038f2a88d40a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6d846f53c26526732f39b1ebccac8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34b5e49102150ea3570b9f2b983ec4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f853e169ad62f5965a3f2a37217efbfa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/39f7cc6c-5660-4c65-8d38-bed051c48f80.png?resizew=259)
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2019-12-23更新
|
251次组卷
|
2卷引用:重庆市云阳县2019-2020学年高二上学期期中考试数学(文)试题
5 . 已知数列
的前
项和
满足:
.
(1)求证:数列
是等比数列,并求数列
的通项公式;
(2)若数列
满足
,
为数列
的前
项和,求证:
.
![](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/67bd36be3bb1aa5eb5db74b2a7af7f7e.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c485d7f863edc6299df64bd89d4705b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e2b779d4e1468d0cc9bb859653f618.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de633c277a234e59e274ffb1f9d59718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cf49305249eb983fb10c95c2287d1ee.png)
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2017-06-20更新
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996次组卷
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4卷引用:重庆市铜梁中学2021-2022学年高二上学期第三次月考数学试题
6 . 已知正项数列
的前
项和为
,且
.
(1)求数列
的通项公式;
(2)设
为数列
的前
项和,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.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/b8c60eaeb9de1df6ef4d92a57d251f5e.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b18c830886c0fdb4e9863114489e2be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d4cfcd6d2101214c8414b7f42a7a5df.png)
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7 . 已知定义在
上的函数
满足
,且
,
,若有穷数列
的前
项和等于
,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf6aefea0eaf6a1b4a9803c91dd72ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1684410122ee4ebd8bf82746b8204d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31399009cb8f04eb8ad5d4f2a583f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0b9b352fe850795177f1a21251d64a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/492b0cd1d4545c6c82528230c8b4b257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/805f45942c944af3364ff34966d64540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.4 | B.5 | C.6 | D.7 |
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2016-12-04更新
|
663次组卷
|
2卷引用:2015-2016学年重庆市一中高二4月月考理科数学试卷
13-14高二上·重庆·期末
解题方法
8 . 已知数列
满足
.
(1)求数列
的通项公式;
(2)设
,探求使
恒成立的
的最大整数值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbb0164533de1657ce8971b8636bedd.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7249dde4e505ca3490256616b21ab1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3f9a7f30a6107a0fe7140289e0c6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
解题方法
9 . 已知数列
的前
项和为
,对于任意的正整数
都有
,且各项均为正数的等比数列
中,
,且
和
的等差中项是10.
(1)求数列
,
的通项公式;
(2)若
,求数列
的前
项和
.
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/663e48327e9c4fcc99cb464757e03d6f.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/f3f6e63dde7b47de9b6102424a3b1a79.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/5cd816cb86234a3fb7ca62515a7ad82f.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/f3f6e63dde7b47de9b6102424a3b1a79.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/03491a2901b944eeb3a59814a1682da2.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/4e142aaeb8f547da882ed9c0451a96da.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/6fdb80f06663478ca255991528c3ebe1.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/39e5030d219046e4accfcf83a75d1fe3.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/2d870221bc2949bc8ce10eee4a71640d.png)
(1)求数列
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/663e48327e9c4fcc99cb464757e03d6f.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/4e142aaeb8f547da882ed9c0451a96da.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/cd3564770dcb4b8caf69ed7b39805d64.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/4c401c3fb37e4be6b2a0c46a9a476b5c.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/f3f6e63dde7b47de9b6102424a3b1a79.png)
![](https://img.xkw.com/dksih/QBM/2015/12/15/1572366134386688/1572366139957248/STEM/b91dd9a99caa4842964a2e1ea906ff55.png)
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