(2.5乘4/5)除以(1/4乘0.8)-0.75除以3/40

问题描述:

(2.5乘4/5)除以(1/4乘0.8)-0.75除以3/40

(2.5*4/5)/(1/4*0.8)-0.75/(3/40)
=2/(1/5)-3/4*40/3
=10-10
=0