(15/8-1/4)×0.8 =(15/8-1/4)×4/5=15/8×4/5-1/4×4/5=3/2-1/5=13/10
②(15/8-1/4)×0.8 =(15/8-2/8)×8×0.1=13/8×8×0.1=13×0.1=1.3
