30.2-17.64+1.539简便方法计算

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30.2-17.64+1.539简便方法计算30.2-17.64+1.539简便方法计算30.2-17.64+1.539简便方法计算30.2-17.64+1.539=30.2-17.64+(1.54-

30.2-17.64+1.539简便方法计算
30.2-17.64+1.539简便方法计算

30.2-17.64+1.539简便方法计算
30.2-17.64+1.539
=30.2-17.64+(1.54-0.001)
=30.2-17.64+1.54-0.001
=30.2-(17.64-1.54)-0.001
=30.2-16.1-0.001
=14.1-0.001
=14.099