解:-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