関連ワード:  1 under root 2 is a rational number    1 upon under root 2 is an irrational number    1 root 2 is an irrational number    is 1 square root of 2 a rational number    prove that 1 upon under root 2 is an irrational number    prove that 1 by under root 2 is an irrational number    1 root 2 is a rational or irrational number    prove that 1 root 2 is a rational number    is 1/√2 a rational number    is 2 root 2 a rational number