Răspuns:
√5³⁴=√(5¹⁷)²=5¹⁷ ∈ Q
√4³¹=√(2²)³¹=√(2³¹)²=2³¹ ∈ Q
√7⁵²=√(7²⁶)²=7²⁶ ∈ Q
√9³⁷=√(3²)³⁷=√(3³⁷)²=3³⁷ ∈ Q