41.2×8.1＋11×9.25＋537×0.19＝41.2×(10-1.9)+(10＋1)×9.25＋537×0.19＝412－41.2×1.9＋92.5＋9.25＋53.7×1.9＝412＋92.5＋9.25＋12.5×(2－0.1)＝412＋92.5＋9.25＋25－1.25＝437＋100.5＝537.5