関連ワード:  is a negative number times a negative number always positive    why is a negative number multiplied by a negative number always positive    is a positive number divided by a negative number always negative    is a negative times a negative always positive    why is a negative number times a negative number positive    what is a negative number times a negative number    why does a negative number times a negative number  
結果 : is a negative number times a negative number always positive