（-47.65）x2又6/11+(-37.15)x(-2又6/11)+10.5x(-7又5/11)
=（-47.65+37.15）x2又6/11+10.5x(-7又5/11)
=-10.5x2又6/11+10.5x(-7又5/11)
=-10.5x(2又6/11+7又5/11)
=-10.5x10
=-105是简便吗？已经简便了