简便计算:[(-7/5)+(-7/3)-(-7/4)]/(-7)

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简便计算:[(-7/5)+(-7/3)-(-7/4)]/(-7)简便计算:[(-7/5)+(-7/3)-(-7/4)]/(-7)简便计算:[(-7/5)+(-7/3)-(-7/4)]/(-7)[(-7

简便计算:[(-7/5)+(-7/3)-(-7/4)]/(-7)
简便计算:[(-7/5)+(-7/3)-(-7/4)]/(-7)

简便计算:[(-7/5)+(-7/3)-(-7/4)]/(-7)
[(-7/5)+(-7/3)-(-7/4)]/(-7)
=[(1/5)+(1/3)-(1/4)][-7]/(-7)
=1/5+1/3-1/4
=(12+20-15)/60
=17/60