簡便計算 ：57*55/56 1/56網友廻答：
- 57X55/56 1/56
= [ ( 56 1 )( 56 - 1 ) 1 ]/ 56
= [ 56" - 1" 1 ]/ 56
= 56
網友廻答：
57*55/56 1/56
=(56 1)(56-1)/56 1/56
=(56²-1)/56 1/56
=56²/56-1/56 1/56
=56
網友廻答：
- 57*55/56 1/56
=(56 1)(56-1)/56 1/56
=(56²-1)/56 1/56
=56-1/56 1/56
=56;
如果本題有什麽不明白可[kě]以追問,
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