1.25×3.28 +12.5×0.24 +125×0.0431=1.25×3.28 +1.25×2.4 +1.25×4.31=1.25×（3.28+2.4+4.31）=1.25×9.99=1.25×（10-0.01）=1.25×10-1.25×0.01=12.5-0.0125=12.4875
