(8-6/13-7/13)×2/7,简便计算,

问题描述:

(8-6/13-7/13)×2/7,简便计算,

(8-6/13-7/13)×2/7
=[8-(6/13-7/13)]×2/7
=[8-1]×2/7
=7×2/7
=2