関連ワード:  does a negative multiplied by a negative equal a positive    is a negative multiplied by a negative equal a positive    does a negative times a negative equal positive    does a negative number multiplied by a negative number equal a positive number    does multiplying a negative by a negative equal a positive    will a negative times a negative equal a positive    can a negative times a negative equal a positive    does a negative times a negative always equal a positive    why does a negative times a negative equal a positive number  
結果 : does a negative multiplied by a negative equal positive