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