20-21高二·全国·单元测试
1 . 在等比数列{an}中,已知(a1+a4)﹣(a2+a3)=3,若
,则a6﹣a5的最小值是___ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47cdceb963ccc930e89ece74e46bf1a2.png)
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2 . 已知
是等比数列,
,且
,
,
成等差数列,若
,则数列
前6项的和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5999dfe5c2dab8c62ffaf8492bc2713d.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87f066219fb69cd05e6189bf6077452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d04a8b7a7595251251b8e0b7e665e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20e049a80f57a589b1f8425b016e73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34bc3df3bea2def2fd30b0f90d75ef32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0f6000421c5370e4b89f23be199f388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5999dfe5c2dab8c62ffaf8492bc2713d.png)
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3 . 我国古代数学典籍《九章算术》第七章“盈不足”中有一道两鼠穿墙问题:有厚墙
尺,两只老鼠从墙的两边相对分别打洞穿墙大老鼠第一天进一尺,以后每天加倍;小老鼠第一天也进一尺,以后每天减半.问两天后,两鼠间距_______ 尺,两鼠相遇时,大鼠共穿了______ 尺墙.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
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2020高三·江苏·专题练习
解题方法
4 . 在正项等比数列
中,若
,则
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fea553d83b7f1484c170547c7d46440e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c273b7656ae822a6d802c09396e49bcd.png)
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解题方法
5 . 已知等比数列
的前
项和为
,
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee8ecde610530e05c65bd579199a0f5.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/dbffc5054dd161ae405971688f773ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92e20bb669df640b56b34c410474873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee8ecde610530e05c65bd579199a0f5.png)
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名校
6 . 已知正项等比数列
中,
,
,用
表示实数
的小数部分,如
,
,记
,则数列
的前15项的和
为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21365765f67cbe258f15ace7499706b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5eee11a27eefa72fa8f80c9999ae2c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f344fd588492f8bcbb5f55b2946ea735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00002246104870bd185a9d444bf138b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48ee1f6186fbfe28a0376c9a77f6573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da56a7efe431e83cd95bc3584ce8604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973d17cd50a4905164d29b8449fafd52.png)
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2020-03-04更新
|
748次组卷
|
5卷引用:2020届安徽省淮北市第一中学高三上学期第四次月考数学(理)试题
2020届安徽省淮北市第一中学高三上学期第四次月考数学(理)试题上海市位育中学2021届高三三模数学试题(已下线)考向17 数列新定义-备战2022年高考数学一轮复习考点微专题(上海专用)人教A版(2019) 选修第三册 过关斩将 第六章 6.3 综合拔高练(已下线)专题3 等比数列基本量运算(提升版)
名校
解题方法
7 . 已知等比数列
满足:
,
是
与
的等差中项,且
不是常数列.记
是数列
的前
项和,若当
时,
取得最小值,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5383c68b875f1647217e7893d36eeed3.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97118aa23232072e4c49f612d6905d50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b2667a6c91b720ca9b42d092c776cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.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/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ca4f2b82d9d7a8323c8d697338a6a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321189c4c80eac29fd3eaacbca7df051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5383c68b875f1647217e7893d36eeed3.png)
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2019高三上·全国·专题练习
名校
8 . 已知等比数列
的首项为
,前
项和为
,若数列
为等比数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ac40aff0a5a02982f0d8b20e7de9f6.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.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/33b96976351dbfd59d102010905767b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51ac40aff0a5a02982f0d8b20e7de9f6.png)
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名校
9 . 设等比数列
的公比为
,前
项和为
.若存在
,使得
,且
,则正整数
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1cf411c8f75433d8a9c5a817d02cf8.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/2f0c73a1455fc61a2239cb62de1f3c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e16b3e36e958cf6226d1c14eecdc3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708913726fcbfaf90f82f1be398bab50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2019-09-19更新
|
236次组卷
|
3卷引用:江苏省南通市海安高级中学2019-2020学年高三上学期9月月考数学试题
江苏省南通市海安高级中学2019-2020学年高三上学期9月月考数学试题(已下线)专题4.2 数列的通项与求和-备战2021年高考数学精选考点专项突破题集(新高考地区)2020年江苏省南通海安市高三学年初学业质量检测数学试题
10 . 记
是等比数列
的前
项和,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3c9ddc2bce6f5856b288254b13b22a.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.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/d300b91cc9377e99780c151cd0fbf37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04554b4dc9163aa0c855659e5833029f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3c9ddc2bce6f5856b288254b13b22a.png)
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