57×55/56+1/56
=（56+1）×55/56+1/56
=55+55/56+1/56
=55+1
=56
57*56分之55+56分之1如何简便计算
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57×55/56+1/56
=（56+1）×55/56+1/56
=55+55/56+1/56
=55+1
=56