拆项法:(-2010又5/6)+(-2009又2/3)+4020又2/3+(-1又1/2)=

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拆项法:(-2010又5/6)+(-2009又2/3)+4020又2/3+(-1又1/2)=

(-2010又5/6)+(-2009又2/3)+4020又2/3+(-1又1/2)
=(-2010-2009+4020-1)+(-5/6-2/3+2/3-1/2)
=-5/6-1/2
=-4/3

=-2010-2009+4020-1-5/6-2/3+2/3-1/2=-4/3

(-2010又5/6) (-2009又2/3) 4020又2/3 (-1又1/2)=-2010又5/6-(-2009又4/6) 4020又4/6-3/2=-3/4

原式=-2010+(-2009)+4020-1-5/6+2/3+2/3-1/2=-5/6+2/3+2/3-1/2=-3/4