6.4+3.07= 2.7-0.2= 7.5-4.8= 0.25×4=
3.8÷0.02= 0.3+0.35= 0.219×0= 4.68×1=
4-3.98= 8.4÷20= 1.8-0.18= 14÷0.07=
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