*是乘号 /是除号0.3*2.5*0.450*0.13*0.20.8*630*0.1250.78*1011.5*1029.8*251.2*2.5+0.8*2.51.25*0.7*0.80.038*5*2.13.8+4.5+6.293/0.31/33.25－0.84-0.1688*0.25*42.8*3.6+1.4*2.863*10.1（3.2+0.128）/0.89.83*1.5...