7.5,7.2,,6.6,。
5.3×1.25.3 5.43×0.99 5. 43 4.84×0.90.9
339×75= 806×34= 76×460=
8.4-5.6= 1.25×0.08= ÷8=
4÷0.2= 50×4%= 7× ÷7× =