问题 解答题 计算:12×2.5=7.5×0.4=1÷0.625=8.4÷4.2=24÷4+56÷4=2.5+2.5×3=0.25×8=12.5÷2.5= 答案 12×2.5=307.5×0.4=31÷0.625=1.68.4÷4.2=224÷4+56÷4=202.5+2.5×3=100.25×8=212.5÷2.5=5