(-47.65)*2又6/11+(-37.15)*(-2又6/11)+10.5*(-7又5/11)
=(-47.65)*2又6/11+(37.15)*(2又6/11)+10.5*(-7又5/11)
=(-47.65+37.15)*(2又6/11)+10.5*(-7又5/11)
=-10.5*(2又6/11)+10.5*(-7又5/11)
=-10.5*(2又6/11+7又5/11)
=-10.5*10
=-105
(-47.65)*2又6/11+(-37.15)*(-2又6/11)+10.5*(-7又5/11)
=(-47.65)*2又6/11+(37.15)*(2又6/11)+10.5*(-7又5/11)
=(-47.65+37.15)*(2又6/11)+10.5*(-7又5/11)
=-10.5*(2又6/11)+10.5*(-7又5/11)
=-10.5*(2又6/11+7又5/11)
=-10.5*10
=-105