÷3= ×0.625= - ×0= 28× =
4.8÷0.8= × = 7π= 0.5²=
× = × = 10- = ÷4= ÷3=
72× = 0× ×25= ×14+ = 17× = ( + )× =
3.8﹣ = 0.73﹣0.3= 0.99÷0.1= ×7.2= 10﹣0.12= ÷4=
8÷4=
4÷8=
70分=小时。