5.4*19.9*0.54用简便方法怎么算
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5.4*19.9*0.54用简便方法怎么算
5.4*19.9*0.54用简便方法怎么算
5.4*19.9*0.54用简便方法怎么算
5.4*19.9*0.54
=5.4*5.4*1.99
=5.4*5.4*(2-0.01)
=58.32-0.2916
=58.0284