関連ワード:  can a negative plus a negative equal positive    does a negative plus a negative equal positive    will a negative plus a negative equal positive    does a negative times a negative equal positive    can a negative times a negative equal a positive    does a negative subtract a negative equal a positive    will a negative times a negative equal a positive    a negative plus a negative equals positive    does a negative plus a negative always equal a positive    a negative times a negative equals positive  
結果 : can a negative plus a negative equal positive