54*56/55-27*28/27　马上要 - 知识问答

54*56/55-27*28/27　马上要

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54*56/55-27*28/27
=（55-1）*56/55-28
=55*56/55-56/55-28
=56-28-1-1/55
=27-1/55
=26又55分之54

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