1 . 已知数列
满足
.
(1)若
,证明:
(i)当
时,有
;
(ii)当
时,有
.
(2)若
,证明:当
时,有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a229ee29685c7ec745dcb07717478885.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
(i)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030f5b94af92e8995f3ba989f1a03d03.png)
(ii)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5930c0f0a7a529f37be1952d976401bd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5d0a73f50b3e4583f1c1b6d6bf0d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e78a219a67a184a4307954aeeb33b4b.png)
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2 . 数列
满足
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1a6694035648a24b0be1e33580cde2.png)
_______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/918be482f1891d73051d71d85c22f303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1a6694035648a24b0be1e33580cde2.png)
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2013高三·湖北·竞赛
3 . 已知互不相等的三个实数
成等比数列,且
构成公差为
的等差数列.则
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b478f8ba2e0909dd35f4ce8e62db07e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c98c59cd4749afdd21e73529fc84323.png)
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4 . 已知数列
满足
且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f69566fce9b3a2a222277c80543888.png)
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46715fcee4be1de050eee9659dfef54c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3436e5633cbbda3efb62eb2d8d912eb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada163c11bfda5b75f7b4461f29b2402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f69566fce9b3a2a222277c80543888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8403d042c0394bcd82b5d0c2ab49e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46715fcee4be1de050eee9659dfef54c.png)
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2012高三·湖北·竞赛
5 . 已知正项数列
满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6c7d57f44d5863c321f9aef80154db.png)
,且
,
.求
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad6c7d57f44d5863c321f9aef80154db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d55f8a012dc7a13f74d4ee603274cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329785900390130a04a57d0b55aaa569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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2012高三·湖北·竞赛
6 . 设
表示不超过实数
的最大整数.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969ce30f7953cac3c102e2e7d0b495a9.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969ce30f7953cac3c102e2e7d0b495a9.png)
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2012高三·湖北·竞赛
7 . 已知数列
满足
若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469384028013368be6aa82c79d7cbb48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e1f53b8629c599143966ca7b49be65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
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8 . 数列
,则这数列第1989项
是( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c7df25986dcbb2df5f87617f82d914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/733197b658c5488d2f5ec763d5dc3d0e.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 数列
各项为非0实数,且满足
,
(1)求使一切
皆为整数时,
和
应满足的充要条件;
(2)如果
,求满足
的最小整数,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff5f914211d402be85b36e8af465898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e127a97b99a61f81e4d8098e1b85229.png)
(1)求使一切
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49dcee02d03dfec117a7c53d355f8d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f5824be1af5b41010976130a3d46377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c705d85fddfc001d4ed99aa1f55de5.png)
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10 . 设
为数列
的前
项之积,满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3fb9f0aabfef71d45adbd60c0431e67.png)
(1)求数列
的通项公式;
(2)设
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.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/b3fb9f0aabfef71d45adbd60c0431e67.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf48cd99db12af9a0652d37ffbbd348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477d02c6e62f565d248fdf594807d68d.png)
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