简便计算,

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简便计算,简便计算, 简便计算,1/12×5/13-1/4×1/13=5/12×1/13-1/4×1/13=1/13×(5/12-3/12)=1/13×2/12=1/78

简便计算,
简便计算,
 

简便计算,
1/12×5/13-1/4×1/13
=5/12×1/13-1/4×1/13
=1/13×(5/12-3/12)
=1/13×2/12=1/78