4.08×0.25=(4+0.08)×0.25=4×0.25+0.08×0.25=1+0.02=1.02
计算过山森缺逗辩程：春猜4.8*0.25=(4+0.8)*0.25=4*0.25+0.8*0.25=1+0.2=1.2
