mantissa part

例句：

1. 1.The decimal expansion of pi is written as 3.14159265358979323846...
   π的十进制展开式写作为3.14159265358979323846...
2. 2. When you divide 10 by 2, the mantissa is 5.
   当你将10除以2时，小数部分是5。
3. 3. In mathematics, the mantissa is the last digit in a number that represents a fraction or a decimal.
   在数学中，尾数是表示分数或小数的最后一位数字。