54*56/55-27*28/27　马上要_其他解答

54*56/55-27*28/27　马上要

人气：225 ℃　时间：2020-04-03 05:28:50

解答

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