(15/56-13/42+11/30-9/20+7/12-1/3)÷1/22×91÷1/8怎么简算?急

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(15/56-13/42+11/30-9/20+7/12-1/3)÷1/22×91÷1/8怎么简算?急
(15/56-13/42+11/30-9/20+7/12-1/3)÷1/22×91÷1/8怎么简算?

(15/56-13/42+11/30-9/20+7/12-1/3)÷1/22×91÷1/8怎么简算?急
(15/56-13/42+11/30-9/20+7/12-1/3)÷1/22×91÷1/8 =(1/7+1/8-1/7-1/6+1/6+1/5-1/5-1/4+1/4+1/3-1/3) =1/8÷1/22*91÷1/8 =91/22 =4又22分之3