関連ワード:  is the sum of two negative numbers always negative    is the sum of two negative integers always negative    is the sum of 2 negative numbers always negative    is the product of two negative numbers always negative    is the sum of two negative numbers positive or negative    is the sum of two negative integers positive or negative    is the product of two negative numbers positive or negative    is the product of two negative integers positive or negative    the sum of two negative numbers is always negative true or false    is the product of two negative numbers always positive or always negative  
結果 : is the sum of two negative numbers always negative