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