简便计算 ：57*55/56+1/56
问题描述：
简便计算 ：57*55/56+1/56
答
57X55/56 + 1/56
= [ ( 56 + 1 )( 56 - 1 ) + 1 ]/ 56
= [ 56" - 1" + 1 ]/ 56
= 56
答
57*55/56+1/56
=(56+1)(56-1)/56+1/56
=(56²-1)/56+1/56
=56²/56-1/56+1/56
=56
答
57*55/56+1/56
=(56+1)(56-1)/56+1/56
=(56²-1)/56+1/56
=56-1/56+1/56
=56;
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