関連ワード:  negative number plus a negative number equals    negative number times a negative number equals    negative number plus a positive number equals    positive number times a negative number equals    negative number times a negative number is    a negative number plus a negative number is    negative number times a positive number is    a negative number plus a positive number is what    does a negative number plus a positive number equal    does a negative plus a negative equal a negative  
結果 : negative number plus a negative number equals