设
、
为正整数,
表示
的所有正约数的
次方之和.证明:对于任意
,存在无穷多个正整数
,使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed3cae890fa274ef757b8eccdd959c3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f06268d1f4821a50da4059839ea8491.png)
2019高三·全国·竞赛 查看更多[2]
更新时间:2018-12-29 11:36:16
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较难
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【推荐1】设
是大于1的自然数,找出所有自然数
,使得对于
存在互质的自然数
、
,满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
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解答题-问答题
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较难
(0.4)
【推荐2】如果既约分数
满足:
(
、
为正整数),则称
为“牛分数”.现将所有的牛分数按递增顺序排成一个数列
,称为“牛数列”.证明:对于牛数列中的任两个相邻项
、
,都满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44ab7024f73ff0cb7e6a48197538a91e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aca595c84a91b9786395b10c4af36a0.png)
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较难
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【推荐1】在
方格表的方格中任意排布1~36的全部整数,每个方格只有一个数.证明:在方格表中的某行里存在这样两个相邻的数,若取它们中的较小者作为二次三项式
的系数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c114f3cc1fd54e5fa3e32fc8a15389.png)
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【推荐2】设
为实数,
.证明:
(1)把
写成无穷乘积有唯一的表达式
其中,
为正整数,满足
;
(2)
是有理数,当且仅当它的无穷乘积具有下列性质:存在
,对所有的
,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948eb26dc27646285335664baad48ec0.png)
(1)把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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(2)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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