-13×2/3-0.34×2/7+1/3×（-13）-5/7×0.34+3
=-13×2/3+1/3×（-13)-0.34×2/7-5/7×0.34+3
=-13*(2/3+1/3)-0.34*(2/7+5/7)+3
=-13-0.34+3
=-13.34+3
=-10.34