関連ワード:  proof root 2 is a rational number    prove root 2 is a rational number    prove root 2 is not a rational number    prove that root 2 is a rational number class 10    proof root 2 is an irrational number    prove root 2 is an irrational number    prove root 2 is an irrational number by contradiction method    prove root 2 is an irrational number class 10th    prove that 6 root 2 is a rational number    prove that 3 root 2 is a rational number