13/15乘以3/13÷1/5乘以1/5 求简便算法!

问题描述:

13/15乘以3/13÷1/5乘以1/5 求简便算法!

分子分母重新排序啊:
原式 = (13*3*5*1)/(15*13*1*5)
= (13/13) * (3/15) * (5/5)
= 1/5
= 0.2