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