0.9÷12.5的简便算法急

问题描述:

0.9÷12.5的简便算法

0.9÷12.5
=(9/10)*(25/2)
=9*2/(10*25)
=9/(5*25)
=9/125
或:
0.9÷12.5
=(0.9*8)/(12.5*8)
=7.2/100
=0.072