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一個有理數的相反數與自身的絕對值的和必為0
設這個數是a, 則①這個數是正數時,由題意得,-a-|a|=-a-a=-2a<0, ②這個數是負數時,由題意得,-a-|-a|=-a-(-a)=-a+a=0, 綜上所述,結果必為非正數. 故選C.
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