12.5*3.9*0.8= (脱式计算)
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12.5*3.9*0.8= (脱式计算)
12.5*3.9*0.8= (脱式计算)
12.5*3.9*0.8= (脱式计算)
12.5*3.9*0.8
=12.5*0.8*3.9
=10*3.9
=39
=(12.5*0.8)*3.9
=10*3.9
=39
12.5*3.9*0.8
=12.5*0.8*3.9
=10*3.9
=39
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