-(2008×5/6)+(-2009×2/3)+4017×2/3+(-1×1/2)
=-2008×5/6-2008×2/3-1×2/3+(2008+2009)*2/3-1/2重做：(-2008×5/6)+(-2009×2/3)+4017×2/3+(-1×1/2)=2008×(-5/6)+2009×(-2/3)+(2008+2009)×2/3-1/2=2008×(-5/6+2/3)+2009×(-2/3+2/3)-1/2=2008×(-1/6)+2009×0-1/2=-2008/6-1/2=-2011/6感激不尽请采纳如果满意请及时采纳。