関連ワード:  does a negative and a negative equal a positive    does a negative and a negative equal a positive in addition    do a negative and a negative equal a positive    does a negative and a negative always 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 divided a negative equal a positive    does a negative plus a negative equal a positive number  
結果 : does a negative and a negative equal a positive