4分之3乘以7分之5-4分之3乘以7分之1=简算
问题描述:
4分之3乘以7分之5-4分之3乘以7分之1=简算
答
3/4×5/7 - 3/4×1/7
= 3/4×(5/7 - 1/7)
= 3/4× 4/7
= 3/7