12.6/0.3-2.1*0.52脱式计算

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12.6/0.3-2.1*0.52脱式计算12.6/0.3-2.1*0.52脱式计算12.6/0.3-2.1*0.52脱式计算=42-2.1*0.5-2.1*0.02=42-1.05-0.042=40

12.6/0.3-2.1*0.52脱式计算
12.6/0.3-2.1*0.52脱式计算

12.6/0.3-2.1*0.52脱式计算
=42-2.1*0.5-2.1*0.02=42-1.05-0.042=40.908