（8.4乘以25乘以63%）除以（84乘以5乘以0.9）的简便运算?
问题描述：
（8.4乘以25乘以63%）除以（84乘以5乘以0.9）的简便运算?
答
8.4/84=0.1
25/5=5
63%/0.9=0.7
0.1*5*0.7=0.35