-13×2/3-0.34×2/7+1/3 ×(-13)-5/7 ×0.34
=-13×2/3+1/3 ×(-13)-0.34×2/7-5/7 ×0.34
=-13×（2/3+1/3）-0.34×（2/7+5/7）
=-13-0.34
=-13.34