-13x2/3-0.34x2/7+1/3x(-13)-5/7x0.34

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答案和解析

=-13x2/3+1/3x(-13)-0.34x2/7-5/7x0.34
=-13(2/3+1/3)-0.34(2/7+5/7)
=-13-0.34
=-(13+0.34)
=-13.34

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