(-2008 5/6)+(-2009 2/3)+4017 2/3 +(-1 1/2)
=(-2008 5/6)+[(-2009 2/3)+4017 2/3] +(-1 1/2)
=(-2008 5/6)+[(-2009- 2/3)+4017+ 2/3 ]+(-1 1/2)
=(-2008- 5/6)+[2008] +(-1-1/2)
=-5/6+(-1-3/6)
=-1-8/6
=-1-4/3
=-2又1/3
(-2008 5/6)+(-2009 2/3)+4017 2/3 +(-1 1/2)
=(-2008 5/6)+[(-2009 2/3)+4017 2/3] +(-1 1/2)
=(-2008 5/6)+[(-2009- 2/3)+4017+ 2/3 ]+(-1 1/2)
=(-2008- 5/6)+[2008] +(-1-1/2)
=-5/6+(-1-3/6)
=-1-8/6
=-1-4/3
=-2又1/3