9.8*62.5*1.25—12.5*0.625*18

问题描述:

9.8*62.5*1.25—12.5*0.625*18

98*0.625*12.5-12.5*0.625*18
=12.5*0.625*(98-18)
=12.5*5/8*80
=12.5*50
=625