4.8×0.125=0.6x8x0.125=0.6x1=0.6 5×2.5×12.5×64=5x2.5x12.5x2x4x8=5x2x2.5x4x1.25x8=10x10x10=1000 4.6×1.9+5.4×1.9=1.9x(4.6+5.4)=1.9x10=19 6.5×12.8-6.5×2.8=6.5x(12.8-2.8)=6.5x10=65