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(-30)*(二分之一减三分之一加五分之三减十分之七加十五分之十二) =(-30)*(1/2-1/3+3/5-7/10+12/15) =(-30)*(1/6+3/5-7/10+4/5) =(-30)*(1/6+7/5-7/10) =(-30)*1/6+(-30)+7/5-(-30)*7/10 =-5-42+21 =47+21 =-26
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