新数学题，大家进来讨论一下吧

是刚刚上海的G友发出来的。

ds题: 说一个数是循环小数0.xyz.......xyz是循环的.问x等与多少

(1)the 50th unints digit to the right of the decimal is 5

(2)the 100th units digit to the right of the decimal is 5

我怎么觉得应该是E啊？

请nn们解答一下，谢谢！

digit,数位，所以觉得应该是从个位数开始数的，（50-1）/3=16+1，所以X=5，所以觉得选A

我不是N人~

恩，看来关键问题是对unints digit的理解上...

在GOOGLE上搜到的

Decimals

We have seen that to the left of the decimal place, the digits represent 1's, 10's, 100's, 1000's, and so on. To find the value of a decimal place, we divide the value of the decimal place to the left of it by 10.

Well, we do the same thing with digits to the right of the decimal place!

Let's look again at the sequence of numbers 1000, 100, 10, 1, and continue the pattern to get new terms by dividing previous terms by 10:

  .1 = 1/10
 .01 = 1/100
.001 = 1/1000


        

So just as the digits to the left of the decimal represent 1's, 10's, 100's, and so forth, digits to the right of the decimal point represent 1/10's, 1/100's, 1/1000's, and so forth.

这个right to the decimal是不是应该指小数点右边呢？

我觉得这道题目的意思就是小数点的右边开始计算的第50位和100位.

因为是3个数字循环，A.第50个数字循环到Y，则Y=5； B.第100个数字循环到X，X=5

所以B是正确答案，说明JJ作者答案还是对的，否则也不会考到760，好牛～