(8-6/13-7/13)×2/7,简便计算,

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(8-6/13-7/13)×2/7,简便计算,

(8-6/13-7/13)×2/7,简便计算,
(8-6/13-7/13)×2/7,简便计算,

(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