関連ワード:  under root 2 is rational or not    under root 2 is rational or irrational    square root 2 is rational or irrational    1 under root 2 is rational or irrational    3 under root 2 is rational or irrational    5 under root 2 is rational or irrational    41 under root 2 is rational or irrational    under root 2 is rational no    why root 2 is not a rational number    is √2 a rational number