13.7*0.25-3.7/4=13.7*0.25-3.7*0.25=[13.7-3.7]*0.25=10*0.25=2.5
13.7乘0.25减3.7除4=13.7x0.25-3.7x0.25=(13.7-3.7)x0.25=10x0.25=2.5
