0.19+0.1= 20×70%= 1﹣= 2.7×4×2.5=
7.53﹣0.03= += +×0= 0.99÷0.1=
①8.06+12.34×0.6
②12-4.83+2.17
③
④4.8÷[(8.4÷7-0.6)×0.2]
①3.12÷15+12.5×28
②
④
□○□=□( )
345﹣298= 0.64÷0.8= ﹣ = × =
1÷0.05= 0.25×40= 2÷ = ×25%=