(1)原式=-2又6/11×(47.65-37.15)+10.5×(-7又5/11)
=-2又6/11×10.5+10.5×(-7又5/11)
=-10.5×(2又6/11+7又5/11)
=-10.5×10
=-105
(2)原式=-13×(2/3+1/3)-0.34×(2/7+5/7)
=-13-0.34
=-13.34
(1)原式=-2又6/11×(47.65-37.15)+10.5×(-7又5/11)
=-2又6/11×10.5+10.5×(-7又5/11)
=-10.5×(2又6/11+7又5/11)
=-10.5×10
=-105
(2)原式=-13×(2/3+1/3)-0.34×(2/7+5/7)
=-13-0.34
=-13.34