0.125×0.25×0.5×6.4=0.125X0.25x0.5x8x0.8=0.125x8x0.25x(0.5x0.8)=1x0.25x0.4=0.1
0.125×0.25×0.5×6.4=0.125×8×0.25×4×0.5×0.2=1×1×0.1=0.1
0.125×0.25×0.5×6.4=0.125×8×0.25×4×0.5×0.2=1×1×0.1=0.1 谢谢