56×9.9＋5.6=5.6×99+5.6×1=5.6×（99+1）=5.6×100=560
=5.6x99+5.6=5.6x(99+1)=5.6x100=560
原式＝56×9.9＋56×0.1＝56×(9.9＋0.1)＝56×10＝560
56×9.8+5.6×2过程
56×9.9＋5.6的简便计算怎么写？=560
