名校
1 . 已知各项均为正数的等比数列
中,
,
,
成等差数列,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7755b0ec8df40da1e10c3567e441be7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20071a42c1f9eac2b173d77d37381da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b2667a6c91b720ca9b42d092c776cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
A.![]() | B.3 | C.![]() | D.1.或![]() |
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3卷引用:陕西省西安中学2023届高三七模理科数学试题
2 . 设等比数列
的前
项和为
,已知
,且
.
(1)求
的通项公式;
(2)设
,数列
的前
项和为
,证明:当
时,
.
![](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/4ccdc17b603871d20843ffccca2df0ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc0907b368c213b5c34aa470824d398.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557bedc26a30ae15509ddca0926619c7.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/5b5d0a73f50b3e4583f1c1b6d6bf0d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f334f99feea517f1844f306b5b491b11.png)
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8卷引用:陕西省西安市第三十八中学2023届高三2月模拟理科数学试题
3 . 我们可以用下面的方法在线段上构造出一个特殊的点集:如图,取一条长度为1的线段,第1次操作,将该线段三等分,去掉中间一段,留下两段;第2次操作,将留下的两段分别三等分,各去掉中间一段,留下四段;按照这种规律一直操作下去.若经过
次这样的操作后,去掉的所有线段的长度总和大于
,则
的最小值为__________ .(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a59fbd6812a044c767944dd833a704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc146f4d7196cfb8fe3cd04575f5dcee.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/f966503d-5c42-4265-9c33-97338eafe64e.png?resizew=286)
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4卷引用:陕西省西安市周至县2023届高三下学期一模理科数学试题
名校
4 . 在各项均为正数的等比数列
中,
,则
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56cd67becd565552c080c6ac2966a26c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1728003683a0df51fe17ca8711f3b341.png)
A.25 | B.5 | C.![]() | D.![]() |
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5 . 设等比数列
的前n项和为
,若
,公比
,
,
,则
( )
![](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/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c5c4ac959eb2c4b74afabc9cdd3a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55feca124a3c380c2e7089c897da73e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9620357ea5be4037cfdccd09a27d3862.png)
A.15 | B.20 | C.31 | D.32 |
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名校
6 . 已知等比数列
的前n项和为
,若
,则
( )
![](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/65b091b4fb455a8c4df617ae6ff072f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
A.![]() | B.5 | C.![]() | D.![]() |
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7卷引用:陕西省西安市东方中学2023届高三一模理科数学试题
名校
解题方法
7 . 已知函数
,
.
(1)证明:
;
(2)若存在直线
,其与两条曲线
和
共有四个不同的交点,设从左到右的四个交点的横坐标分别为
,
,
,
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68cbe31433924ecca1849dd4348607ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a746e332151930493d548cc1c4b7ff7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943ee35cf1dda502256a9a3a90a94778.png)
(2)若存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af79f45b5880c72a349500da9d8e118d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3897bf276a0b6c2121917d39b369df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990b6dc6b90ee98d5a95e1518bbd61b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e798a8fe1cd6b2e0c2cb462ac29dbc0.png)
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8 .
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a9ce63554a1e56a0ac65a523770964.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4卷引用:陕西省西安市第三十八中学2022-2023学年高三上学期一模数学试题(文科)
名校
解题方法
9 . a,b,c分别为
内角A,B,C的对边.已知
.
(1)求C;
(2)若c是a,b的等比中项,且
的周长为6,求
外接圆的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d047b24483203a96deabcfbcdfe084b2.png)
(1)求C;
(2)若c是a,b的等比中项,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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7卷引用:陕西省西安市第三十八中学2022-2023学年高三上学期一模数学试题(文科)
陕西省西安市第三十八中学2022-2023学年高三上学期一模数学试题(文科)陕西省西安市第三十八中学2022-2023学年高三上学期第一次模拟数学试题(理科)青海省西宁市大通回族土族自治县2023届高三一模数学(理)试题云南省部分学校2023届高三上学期12月联考数学试题(已下线)专题3-2 解三角形最值范围与图形归类(讲+练)-2(已下线)专题12 解三角形综合-3甘肃省靖远县第一中学等2校2023届高三上学期期末理科数学试题
10 . 已知数列
的前
项和为
,且
.
(1)求证;数列
是等比数列;
(2)求证:
.
![](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/c9d416aa2d2e0415f6b3a663ccc3772e.png)
(1)求证;数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2de706dc5f0439b989273a5367f63a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a0efd37ab066a4d3490dc8fbd4fc820.png)
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