関連ワード:  2 is a rational number true or false    2 3 is a rational number true or false    √ 2 is a rational number true or false    root 2 is a rational number true or false    1 2 is a rational number true or false    2 is an irrational number true or false    root 2 is an irrational number true or false    2 3 is an irrational number true or false    2 √ 3 is an irrational number true or false    √ 5 3 2 is a rational number true false