4.2*2/5乘8/7*0.75

问题描述:

4.2*2/5乘8/7*0.75

4.2x2/5x8/7x0.75
=21/5x2/5x8/7x3/4
=(21/5x8/7)x(2/5x3/4)
=24/5x6/20
=144/100
=1.44