7分之5乘37.5%加8分之5乘7分之5过程

问题描述:

7分之5乘37.5%加8分之5乘7分之5过程

5/7 x 37.5% + 5/8 x 5/7
提取5/7 =5/7 x (37.5%+5/8)
=5/7 x (3/8 + 5/8)
=5/7 x 1
=5/7