1460÷4=0÷1÷124 = 124÷4 =5×20%÷5×20%=124 －102 = 4987794515415 =0.375×0.625= × =12x－ x=451 50%x－1.2×12 =1.6 （ 1245－1226.1 ）×2 ÷3 1÷（128－12 ）×17.2 12.78－0÷（ 13...