已知递增等比数列
的前n项和为
,
,
,
,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/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9b1aa5008e654df65b8abdb3845e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ef35b21da4cd8130642539d8245f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36243198e5e20c56399e4ad5ac3c519.png)
A.62 | B.126 |
C.66 | D.130 |
更新时间:2021-12-25 21:57:21
|
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单选题
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适中
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解题方法
【推荐1】设等比数列
的前
项和为
,若
,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/2f0891c3edb3bdb5254ae5cba0dd279f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce44cdc798888e0920e0441deadd255.png)
A.1 | B.2 | C.3 | D.4 |
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解题方法
【推荐2】已知正项等比数列
满足
,若
是
和
的等差中项,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa9f325b94ed4cf1e58636c49af2af2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7677da1f68af02d80f4b04db9539502c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20147dab3fdc849c2ca7f32a2edecb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ee290ea11c19717a17ae23bbe57906.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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名校
【推荐1】已知正项等比数列
满足
,则
取最大值时
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454852bd544d7beb8667bc2b580e8af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b422a39788aeb7ad87dfc81ec9e96a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.8 | B.9 | C.10 | D.11 |
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解题方法
【推荐2】某校组织知识竞赛,已知甲同学答对第一题的概率为
,从第二题开始,若甲同学前一题答错,则此题答对的概率为
;若前一题答对,则此题答对的概率为
.记甲同学回答第
题时答错的概率为
,当
时,
恒成立,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9763337e402b59931bdd67be439843.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
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您最近一年使用:0次
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【推荐1】已知等比数列
中,
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f1aa32dfe41553bc8baeb42ed0767df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070a3cd6a2accc5393f4bedbb47af60c.png)
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A.2 | B.3 | C.4 | D.5 |
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【推荐2】已知数列
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,且
,
,若数列
也是等比数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.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/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c07cefac60bb3fcde0bded804501c90b.png)
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