関連ワード:  is 1+√3 a rational number    is 1 3 a rational number    is 1 3 a rational number or irrational    is 1 third a rational number    is 1 2 3 a rational number    is 1 over 3 a rational number    is 1 3 4 a rational number    is negative 1 3 a rational number    is 1 root 3 a rational number    is 5 1 3 a rational number