(-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