関連ワード:  is 1/√2 a rational number    is 1 2 a rational number    is 1 2 a rational number and an integer    is 1 2 a rational number or irrational    is 1 2 a rational number or not    is 3 1 2 a rational number    is 1 √ 2 a rational number    is negative 1 2 a rational number    is 4 1 2 a rational number    is 5 1 2 a rational number