30.2-17.64+1.539怎样简便

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30.2-17.64+1.539怎样简便30.2-17.64+1.539怎样简便30.2-17.64+1.539怎样简便30.2-17.64+1.539=31.739-17.64=14.099

30.2-17.64+1.539怎样简便
30.2-17.64+1.539怎样简便

30.2-17.64+1.539怎样简便
30.2-17.64+1.539
=31.739-17.64
=14.099