関連ワード:  does a negative a negative equal a positive    does a negative times a negative equal a positive    does a negative plus a negative equal a positive    does a negative minus a negative equal a positive    does a negative over a negative equal a positive    does a negative and a negative equal a positive in addition    does a negative divided a negative equal a positive    do a negative and a negative equal a positive    does a negative multiplied by a negative equal a positive    does a negative xa negative equal a positive  
結果 : does a negative a negative equal a positive