将1至这
个自然数随机填入n×n方格的
个方格中,每个方格恰填一个数(
).对于同行或同列的每一对数,都计算较大数与较小数的比值,在这
个比值中的最小值,称为这一填数法的“特征值”.
(1)若,请写出一种填数法,并计算此填数法的“特征值”;
(2)当时,请写出一种填数法,使得此填数法的“特征值”为
;
(3)求证:对任意一个填数法,其“特征值”不大于.
更新时间:2019-02-14 13:18:07
|
【知识点】 归纳推理
相似题推荐
解答题-问答题
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较难
(0.4)
【推荐1】给正有理数
、
(
,
,
,且
和
不同时成立),按以下规则
排列:① 若
,则
排在
前面;② 若
,且
,则
排在
的前面,按此规则排列得到数列
.
(例如:
).
(1)依次写出数列
的前10项;
(2)对数列
中小于1的各项,按以下规则
排列:①各项不做化简运算;②分母小的项排在前面;③分母相同的两项,分子小的项排在前面,得到数列
,求数列
的前10项的和
,前2019项的和
;
(3)对数列
中所有整数项,由小到大取前2019个互不相等的整数项构成集合
,
的子集
满足:对任意的
,有
,求集合
中元素个数的最大值.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738d701bf35c715a18b1e917d188a115.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce017942d2202b78bf27e06c302b4e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(例如:
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(1)依次写出数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)对数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
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(3)对数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c077edc783173d305f782378c885866.png)
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较难
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解题方法
【推荐2】组合数学中有一著名问题——Hanoi问题:n个圆盘依其半径大小,从下而上套在A柱上,如图1所示.每次只允许取一个移到B柱或C柱上,而且不允许大盘放在小盘上方.问若要求把A柱上的n个盘移到C柱上要移动多少次(只有A,B,C三根柱子可用).
![](https://img.xkw.com/dksih/QBM/2023/5/22/3243098679615488/3245146346930176/STEM/11116fded3e84eb3a9841659f8027ec4.png?resizew=131)
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