简便计算 :57*55/56+1/56

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简便计算 :57*55/56+1/56
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简便计算 :57*55/56+1/56
简便计算 :57*55/56+1/56

简便计算 :57*55/56+1/56
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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57*55/56+1/56
=(56+1)(56-1)/56+1/56
=(56²-1)/56+1/56
=56²/56-1/56+1/56
=56

57X55/56 + 1/56
= [ ( 56 + 1 )( 56 - 1 ) + 1 ]/ 56
= [ 56" - 1" + 1 ]/ 56
= 56