1 . 在x轴的正方向上,从左向右依次取点列
以及在第一象限内的抛物线
上从左向右依次取点列
使
都是等边三角形,其中
是坐标原点.则第2005个等边三角形的边长是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f96a0381437ae2e6a675cf5251b29c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5ad148899b68076f540fc0d2511f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d727cbd74f87ed961657e36406df54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891751feed5b0e5c3cfea1e51749d611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7356ec98b600ece41f3a6b4bc26a7d59.png)
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2 . 已知数列
,满足
,且
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72fb56341120c8ae0660244026b6eca.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a39fe0a3527ae1cf0a394c0086805c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4a85f20ecf0e47ab48fa8f1e1e006a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56f2b7ab82754c8ac87486ebcb83c9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d72fb56341120c8ae0660244026b6eca.png)
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3 . 在
的100个整数中,任意选取三个互不相同的数组成有序三元数组
,求满足方程
的三元数组的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5eb93fc94e763d86ca9fba42b19b34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b525d8c768efd801ab58bc4c0da9221e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55e3d4075ab864fffe2111e0e1612d7.png)
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4 . 设数列
定义为
.求所有实数a,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58f84983f68fc8dde0edfce082592c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ae926474a6160e692a194e4d8c7c0e.png)
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5 . 设
是定义在
上的奇函数,且对任意
,有
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3566434201152a758fc96f620891e5.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2c691d0c48afd0ce87fd1b58ce876b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3566434201152a758fc96f620891e5.png)
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6 . 已知等比数列
,则
=.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630d5ca791f47806bd629bf73fb2d8bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5607c019c731e7deb19a5fc1cf3b7373.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 给定数列
,且
,则
的值是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a39fe0a3527ae1cf0a394c0086805c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f667b2d8a8de118cb0fea49dc2e2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db59c6082aa1b8def03bd61c326d61dc.png)
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8 . 把正有理数按下列规则作成序列:
则数
所在位置的序号是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2068eeff3006c0689f26bc3fba1b88cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b1d0589ffc0aed6f3b2c6689644e79.png)
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9 . 已知数列
、
满足
,
,
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d765033fa3e470b4b4bae90a28514587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a6034b7e6823f957dd56c1f4babd80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7019319313e67e4a11365e90a56f7c8d.png)
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10 . 已知函数
满足
,
,且
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b2890087f236dd5d3c67586dbf3057.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f046d239310ec05492a5b5a25956da6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79041052fb86cee54c9f22b81fe4c50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3875104bf1925a4f2a99a1f4fb585c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b2890087f236dd5d3c67586dbf3057.png)
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