-13 * 2 / 3-0.34 * 2 / 7 + 1 / 3 * (- 13) - 5 / 7 * 0.34 * is a multiplication sign and / is a semicolon

-13 * 2 / 3-0.34 * 2 / 7 + 1 / 3 * (- 13) - 5 / 7 * 0.34 * is a multiplication sign and / is a semicolon

-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