数学题解答用简便方法计算下面各题.2.5x4.4 32x0.25x12.5 3.64x0.8+6.36x0.8-3.8

2.5x4.4=0.25*44=44/4=11
32x0.25x12.5=(8*4)*0.25*12.5=(4*0.25)*(8*12.5)=1*100=100
3.64x0.8+6.36x0.8-3.8=0.8*(3.64+6.36)-3.8=0.8*10-3.8=8-3.8=4.2