①要修一条1.2千米的路,每天修0.5千米,几天修完?
②妈妈用1.2元买了0.5千克青菜,1千克青菜要多少钱?
③聪聪跑了1.2千米,明明跑的路程是聪聪的一半,明明跑了多少千米?
①(8.3-3.26) ÷3.6×7.5
②4.19×3.6+7.4×4.19-4.19
③12.5×0.17×0.8×4
④1.35× (12.9-28.5÷3.8)
68+32= 10-0.6= 1.25×80= 0.8÷0.04=
2.4÷ = × = 5×8%= ÷ =