(乘法结合律) 3.29×0.25×4 =3.29×(0.25×4) =3.29×1 =3.29 (减法交换) 7.325-3.29-3.325 =7.325-3.325-3.29 =4-3.29 =0.71 (减法的性质) 7.325-(5.325+1.7) =7.325-5.325-1.7 =2-1.7 =0.3 (乘法分配率) 36-36×0.5 =3.6×(1-0.5) =3.6×0.5 =1.8 (减法的性质) 3.29-0.73-2.27 =3.29-(0.73+2.27) =3.29-3 =0.29 (同级运算交换) 7.5+2.5-7.5+2.5 =(7.5-7.5)+(2.5+2.5) =0+5 =5
