小数 的中文句子和英文句子

循环小数｀3.999...＇亦作｀3.9循环＇.

The recurring decimal 3.999... is also described as 3.9 recurring.


占位符号在一个数的小数形式中，没有意义的数字

In the decimal form of a number, a digit that is not significant.