0.125乘以3.2乘以0.5=1/8 X 3.2 X1/2=0.2
0.125 * 3.2 * 0.5
= 0.125 * (8*0.2*2) * 0.5
= (0.125*8) * 0.2 * (2*0.5)
= 1*0.2*1
= 0.2
0.125*3.2*0.5=1/8 * 3.2 *0.5=0.4 *0.5=0.2
0.125*(8*0.2*2)*0.5
=1*0.2*1
=0.2
0.125x3.2x0.5
=0.125x8x0.4x0.5
=1x0.2
=0.2
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