関連ワード:  does a negative minus a negative equal a positive    can a negative times a negative equal a positive    does a negative times a negative equal a positive    does a negative divided by a negative equal a positive    does a negative times a negative always equal a positive    does a negative number minus a negative number equal a positive number    a negative times a negative equal a positive    does a negative number times a negative number equal a positive    does a negative number divided by a negative number equal a positive number    a negative times a negative equals a positive movie  
結果 : can a negative minus a negative equal a positive