能简便计算的简便计算:【1-(1-2/3/2/3)】*7/18

问题描述:

能简便计算的简便计算:【1-(1-2/3/2/3)】*7/18

【1-(1-2/3/2/3)】*7/18
=【1-(1-1)】*7/18
=1*7/18
=7/18