27.38-54.34+2.62-4.66简便计算

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27.38-54.34+2.62-4.66简便计算27.38-54.34+2.62-4.66简便计算27.38-54.34+2.62-4.66简便计算27.38+2.62-(54.34+4.66)

27.38-54.34+2.62-4.66简便计算
27.38-54.34+2.62-4.66简便计算

27.38-54.34+2.62-4.66简便计算
27.38+2.62-(54.34+4.66)