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1 . 等比数列
的各项均为正数,其前n项和为
,已知
,
,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/22ab4706be6b3854b9c30ab609e5da68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c289a2664633d3b8d43eeffc90dcae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0382b4a2ab0657d2d6830bb6be2b17b6.png)
A.![]() | B.32 | C.64 | D.![]() |
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2 . 已知△ABC中内角A,B,C的对边分别为a,b,c,且满足条件
.
(1)求B的大小;
(2)如果b=2,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/901805ccfb9d2af1cc95cbccec65877b.png)
(1)求B的大小;
(2)如果b=2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4a4f66bbaec57120052c925c25c656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2148f50f80707c518dce7b18f5ed28.png)
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3 . 已知数列
;数列
是等比数列,
成等差数列.
(1)求
、
通项公式;
(2)若
前n项和
满足
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e11e39abe5d7cefc45234cfa27053b9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623619e8e268f075268532378dd24175.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af110d007e2ad8ec987a948b8854f724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad7687f6d9810d2d8e243bb919ae1ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc8c7b6a2c391b291e1445f309cad3f.png)
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解题方法
4 . 已知
,
满足不等式组
,则目标函数
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0784e15260760a3ef0f832aeef7f9bdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee51b0cac927e6445e4b94438c2ff3da.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 十七世纪德国著名的天文学家开普勒曾经这样说过“几何学里面有两件宝,一个是勾股定理,一个是黄金分割,如果把勾股定理比作金矿的话,那么可以把黄金分割比作砖石,”黄金三角形有两种,其中底与腰之比为黄金分割比的黄金三角形被认为最美的三角形,它是一个顶角为
的等腰三角形(另一种是顶角为
的等腰三角形),如图所示的五角星由五个黄金三角形与一个正五边形组成,在其中一个黄金
中,
,根据这些信息可得到
( )
![](https://img.xkw.com/dksih/QBM/2022/3/1/2926965973352448/2933165468925952/STEM/42415f22-54b1-4e46-977a-099e02de884f.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ac0ea8ecb56b0ca8943509dd2b5657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26c1e27ff08d4fdfff5a5395a1c6e237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38abf0af6b05e7fd67b5c5de765675c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/273a1cc69a748331f3e28c0d360a2b9c.png)
![](https://img.xkw.com/dksih/QBM/2022/3/1/2926965973352448/2933165468925952/STEM/42415f22-54b1-4e46-977a-099e02de884f.png?resizew=188)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 已知数列
是首项为1的等差数列,数列
满足
,且
,
.
(1)证明数列
是等比数列并求
的通项公式;
(2)令
,求数列
的前
项和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1857d02529cce9ad6d1f80dc5c0f3bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/368dc84a523ce87b9962505c06a9bfd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36676cd8165b9136b1127e73565dac0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
(2)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9221c0c92a526f65533cdc5400767af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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7 . 两个等差数列![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c65b27d8a960659cb02151cb31c112.png)
则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7c65b27d8a960659cb02151cb31c112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e80c43eb141cd568a48badc0a7a5363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265397c51288caa8df9b42f1f698b5a5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 数列
是公差不为零的等差数列,
为其前n项和.若对任意的
,都有
,则
的值不可能是( )
![](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/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6da76e184660b4355fa38f0009c64ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/478583185c714fd7ded0df05a03dc082.png)
A.![]() | B.2 | C.![]() | D.3 |
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解题方法
9 . 设首项大于0的数列
的前n项和为
,若
,
,则下列说法正确的是( )
![](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/23ff0a19f71121c415a95a60f86ab9c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ca5bc440491fd3a5df71dd55086632.png)
A.![]() | B.![]() |
C.![]() ![]() | D.使![]() |
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解题方法
10 . 已知数列
,
满足:
,
,则数列
的前9项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f90d16df7d38c851b2619785aff282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46926541ba7475097cdb971a04d371b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
A.1022 | B.99 | C.90 | D.45 |
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