(1/9-1/12)*9*12= 简便计算

问题描述:

(1/9-1/12)*9*12= 简便计算

原式=(1/9)*9*12-(1/12)*9*12
=1*12-1*9
=12-9
=3

(1/9-1/12)*9*12
=1/9x9x12-1/12x12x9
=12-9
=3
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