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英语翻译1.Using all of the digits 1,2,3,4 and 5 only once for wach number,you can make 120 different numbers.If you pu these numbers in an increasing older,what number is the 75th?2.Prove that no number in the sequence 11,111,1111,11111……is the square of an integer.

分类: 作业答案 • 2021-12-20 07:04:08

问题描述：

英语翻译
1.Using all of the digits 1,2,3,4 and 5 only once for wach number,you can make 120 different numbers.If you pu these numbers in an increasing older,what number is the 75th?
2.Prove that no number in the sequence 11,111,1111,11111……is the square of an integer.

答

最后一个问题因为没有一个平方数的末位是 1

答

题目还是自己解吧,我也解不出,像是数学题.
1.使用数字1,2,3,4,5,每个用一次,可以得出120个不同的数字,那如果把这些数字由小到大排列,第75个数字是什么?
试解一下：1打头的数字有24个,那一直到3打头的数字共有72个,所以第75个数字应该是41325
2.证明11,111,1111,11111……这排数字里不存在任何一个整数的平方.
不知道怎么证明,脚趾头想象就不可能有平方数,都是单数嘛,平方数最起码是双数啊.

英语翻译1.Using all of the digits 1,2,3,4 and 5 only once for wach number,you can make 120 different numbers.If you pu these numbers in an increasing older,what number is the 75th?2.Prove that no number in the sequence 11,111,1111,11111……is the square of an integer.

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