1 . 等比数列{an}的首项a1=1,前n项的和为Sn,若S6=9S3,则a6=____ .
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2 . 已知正实数
满足
,则
取得最小值时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
_____ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0fffbec1fe851795dfdd448bf0d165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872be4645b9ccafc2744f8c822d17005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c25073a38986724681973a501d151102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070d1ea22a92808dad7489438c239629.png)
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名校
3 . 在等比数列
中,若
,
,则
的值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed04915f942ba96d2209f6d0f3a890c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81911c0e1a8b5472bbec7b78974f5bf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65fc200f10b97588a0c9896277c9c64.png)
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2016-12-05更新
|
316次组卷
|
2卷引用:2016-2017学年广东汕头潮阳实验学校高二上期中数学试卷
解题方法
4 . 已知
,
,
,则
的最小值为________ .
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170319384576/1573170325069824/STEM/4990d17bf4b643c9b5b8d6b2dc7dab53.png?resizew=38)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170319384576/1573170325069824/STEM/ba4fbf96b8fd425a933cc4d5ba8a465e.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170319384576/1573170325069824/STEM/44d3ef61fa584d388792e28e0519cd25.png?resizew=60)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170319384576/1573170325069824/STEM/d2e022a7ae1147b8959867f6c34e71b0.png?resizew=55)
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5 . 已知数列{an}满足:an≤an+1,an=n2+λn,n∈N*,则实数λ的最小值是_______
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解题方法
6 . 若实数
,满足
则S=2x+y-1的最大值为_______
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170216296448/1573170221760512/STEM/ccc9297b58eb46518c094de63e68f931.png?resizew=82)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573170216296448/1573170221760512/STEM/79597a6b06d545a6947820ca4062e75d.png?resizew=66)
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7 . 数列
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1d0807149e86eb966a243ceb6c46b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
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解题方法
8 . △ABC的内角A、B、C的对边分别为a、b、c,若
A:
B:
C=7:8:13,则角C=_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bdec75fbee7f3f88122d98375d6ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bdec75fbee7f3f88122d98375d6ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bdec75fbee7f3f88122d98375d6ee1.png)
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解题方法
9 . 顶点在单位圆上的
中,角
所对的边分别为
.若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acd3ee01d9f843a8579ffb0b7d9d82.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32e7ffe58b6da39c8e1ad036bfa99b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf0b9b24c44f56961262b7ed05b5f0cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acd3ee01d9f843a8579ffb0b7d9d82.png)
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解题方法
10 . 已知数列
中,
,则
的值为__________ .
![](https://img.xkw.com/dksih/QBM/2016/11/23/1573169345814528/1573169351925760/STEM/3a23feafa2e3442bb2208b0ce003118f.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2016/11/23/1573169345814528/1573169351925760/STEM/d17392b315f74f27a973aeca231ebf0d.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2016/11/23/1573169345814528/1573169351925760/STEM/4248ebd3891b430182c9b4bc00bc03d5.png?resizew=24)
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