32乘0.25乘12.5乘0.2乘5=4*0.25*8*12.5*0.2*5=1*100*1=100
32x0.25x12.5x0.2x5=4x8x0.25x12.5x0.2x5=(0.25x4)x(12.5x8)x(0.2x5)=1x100x1=100
