0.5x0.25×0.125x8x4=0.5x0.25×(0.125x8)x4=0.5x0.25×1x4=0.5x(0.25x4)=0.5x1=0.5
0.5x0.25×0.125x8x4=0.5x(0.25x4)x(0.125x8)=0.5x1x1=0.5谢谢,请采纳