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54*56/55-27*28/27 马上要
人气:186 ℃ 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
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