-13×2/3-0.34×2/7+1/3 ×(-13)-5/7 ×0.

问题描述:

-13×2/3-0.34×2/7+1/3 ×(-13)-5/7 ×0.

-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