简便:(40.2*8.1*4/5)/(0.8*81*20.1)

问题描述:

简便:(40.2*8.1*4/5)/(0.8*81*20.1)
括号外的是除号!

简便:(40.2*8.1*4/5)/(0.8*81*20.1)
=(2×20.1×8.1×0.8)/(0.8×8.1×10×20.1)
=2/10
=0.2