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

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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