(-13)×(2/3)-0.34×(2/7)+(1/3)×(-13)-(5/7)×0.34 =(-13)x(2/3)+(1/3)x(-13)-0.34x(2/7)-(5/7)x0.34=(-13)x(2/3+1/3)-0.34x(2/7+5/7)= -13-0.34= -13.34
(-13)×(2/3+1/3)-0.34×(2/7+5/7)=-13.37
