関連ワード:  is 1 2 a rational number and an integer    is 1/2 a rational number but not an integer    is 3 1 2 a rational number but not an integer    is 4 1 2 an integer and a rational number    is - 1/2 a rational number    are all integers rational numbers  
結果 : is 1 2 a rational number and an integer