55x55/56=?的简便算法?

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55x55/56=?的简便算法?
55x55/56=?的简便算法?

55x55/56=?的简便算法?
55×55/56
=(56-1)×55/56
=56×55/56-1×55/56
=55-55/56
=54又1/56

=(55*55-1+1)/56
=(55+1)(55-1)/56 + 1/56
=54又56分之1