関連ワード:  is 2 root 2 a rational number    is 2 square root 2 a rational number    is 2 root 2 an irrational number    is root 2 over 2 a rational number    2 root 2 is a rational number or not    is root 2 a rational number justify your answer    is root 2 a rational number or irrational    is root 2 a rational number justify    root 2 root 2 is a rational number true or false    is under root 2 a rational number