1 . 已知正项数列
:
.则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5817a3fddc048ac8a886ab2d2e8d5a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.递增有上界 | B.递增无上界 | C.递减有下界 | D.递减无下界 |
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2 . 若数列
满足
,
,则使得
的正整数
的数目为( )个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb93df462dde10cc60418cbccaaeb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c8d0474f7d81ef8dbefaacfd5afe7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea53c334b2d633d73489f95cd4e57841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596f7c59b0df339616870dde35061191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.0 | B.1 | C.2 | D.大于2 |
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3 . 已知复数列
的通项为
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215910c42f0201cde78badd49d3ea64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6bf00862819256395dbe928cd7c4f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215910c42f0201cde78badd49d3ea64.png)
A.![]() | B.![]() | C.1 | D.2 |
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4 . 设在一个三角形内给定
个点,将这些点及原三角形顶点彼此连接,使所得线段不相交,且将原三角形划分成
个小三角形.则.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
A.对任何![]() ![]() |
B.对任何![]() ![]() |
C.当且仅当![]() ![]() |
D.当且仅当![]() ![]() |
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5 . 设数列
满足
,
.若
为
的前n项和,则
的个位数字为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ecf69901899bba130968c7a091790d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd2622eb7a25fbe22f2e74a478788dfb.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/b6252e443f22097fc949fa0540eb898d.png)
A.l | B.2 | C.5 | D.6 |
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