1-[1-(3/4-3/4÷6/5)]÷7/8
=1-[1-(3/4-3/4×5/6)]÷7/8
=1-[1-3/4×(1-5/6)]÷7/8
=1-[1-3/4×1/6]÷7/8
=1-[1-1/8]÷7/8
=1-7/8÷7/8
=1-1
=0
简便运算,1减【1减（四分之3减四分之3除以五分之6）】除以八分之7
1-[1-(3/4-3/4÷6/5)]÷7/8
=1-[1-(3/4-3/4×5/6)]÷7/8
=1-[1-3/4×(1-5/6)]÷7/8
=1-[1-3/4×1/6]÷7/8
=1-[1-1/8]÷7/8
=1-7/8÷7/8
=1-1
=0