1 . 数列
中,
,
.则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49055fd678a1d55f8e4980fe51ffa191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320e9b39e5e8d0c2bd9f55065679b159.png)
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2 . 设
个质数
构成公差为
的等差数列,且
.求证
(1)当
是质数时,
;
(2)当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07db6ce04312bf94f979433d1caac1c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0679d49843bad1b49d905662b4e37ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc707cbf72459c71ed9ed6efe4d9395.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e6766e4cfdcfb19daf5a0fedf5df17.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4437eb75ca2a5cb8d467802bd48933c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77969cd0bf8081594e9364e4fdc5ac3a.png)
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3 . 在三角形中,三条边长成等差数列是三边的比为3 :4 :5的.
A.充分而不必要条件 | B.必要而不充分条件 |
C.充分必要条件 | D.既不充分也不必要的条件 |
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4 . 已知数列
:
,其中
是方程
的两个根,
求证: (1)对任意正整数
,都有
;
(2)数列
中的项都是正整数,且任意相邻两项都互质.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74df23ef1c8916c62f9b23a59c567f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ffdbc2dd999c9e421bdc1e516d99206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d425033162db73dac1ec662964b120.png)
求证: (1)对任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/502fa2b7493da2df086efda58bc09ac7.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
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5 . 已知数列
中,
,
,
且
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3bdf8334e28e86a5717fb63e765411.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29518f13a1ebc3fff8181c2d7cfba22f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/381576e698a46df8c497e6b5f8346ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfe8e8ac35b1fe557837eb4c29aa80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22c135801de83615d92a82a0764ba62d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf0b257c6bc4e6b979348f1585d621b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3bdf8334e28e86a5717fb63e765411.png)
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6 . 将2004表示为
个彼此不等的正整数的和,则
最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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7 . 已知
.则
被17除的余数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6802c6c55d4db229042310d783be43b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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8 . 正实数列
中,
成等差数列,
成等比数列,且公比不等于1.又
的倒数成等差数列,则、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7a2c89be8c7c35e472c9c88b3f2138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e616142cd7122cb7c4e9bc46bb7394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b862c625e9afa23d5790b08dd3516d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e04e2402c1ee84b914273e44c819e5.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 已知各项均为正数的等比数列
和一个等差数列
,满足
,且
. 记该等比数列前 6 项的和等于 G6 , 该等差数列前 12 项的和等于 A12, 则 G6 +A12 = __________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b123deadadcb52be0120e8465f73a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3a53be99f98d6f166c59853a43ac49.png)
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10 . 定义在正整数集合上的函数
令
,则集合
中的元素共有__________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9d7bde156b771569a9b7a714e84dae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d048867dc97879867bf3c9c943fd9d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84929e92642288e979c9d05deed81c20.png)
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