-13×2/3-5/7×0.35-1/3×(-13)-2/7×0.35

问题描述:

-13×2/3-5/7×0.35-1/3×(-13)-2/7×0.35

原式=(-13)×(2/3-1/3)-0.35×(5/7+2/7)=(-13)×1/3-0.35=-281/60