関連ワード:  is 8 a rational number    is 8 a rational number or irrational    is 8 a rational number or not    is 7 8 a rational number    is 3 8 a rational number    is 5 8 a rational number    is negative 8 a rational number    is 8 9 a rational number    is 1 8 a rational number    is √ 8 a rational number