(6/(-7))*(-57)-(6/7)*(-27) 用简便算法算,

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(6/(-7))*(-57)-(6/7)*(-27) 用简便算法算,
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(6/(-7))*(-57)-(6/7)*(-27) 用简便算法算,
(6/(-7))*(-57)-(6/7)*(-27) 用简便算法算,

(6/(-7))*(-57)-(6/7)*(-27) 用简便算法算,
(6/(-7))*(-57)-(6/7)*(-27)
=6/7*(57+27)
=6/7*84
=72