-13×2/3-0.34×2/7+1/3×(-13)-5/7×0.34

问题描述:

-13×2/3-0.34×2/7+1/3×(-13)-5/7×0.34

-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