関連ワード:  why does a negative minus a negative equal a positive    why does a negative times a negative equal a positive    why does a negative divided by a negative equal a positive    why does a negative times a negative equal a positive number    does a negative subtract a negative equal a positive    do a negative times a negative equal a positive    does a negative minus a negative always equal a positive    why is a negative number times a negative number equal a positive number    why does subtracting a negative equal a positive    will a negative times a negative equal a positive  
結果 : why does a negative minus a negative equal a positive