80×4.2×0.0125=4.2×(80×0.0125)=4.2×1=4.23.76×5.4-2.76×5.4=(3.76-2.76)×5.4=1×5.4=5.4
80x4.2x0.0125=4.2x(8x0.125)=4.2x1=4.2
