(1, 2)
1
(1, 2, 3, 4, 5)
(1, 2, 3, 4, 5)
((1, 2), 3, 4, 5)
(1, 2, -3, 4.0, -5.0) : ℕ × ℕ × ℤ × 𝔽 × ℚ
((1 / 2, 1), 2) : (𝔽 × ℕ) × ℕ
3
29
-50