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-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
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