no goals
α : Type u
inst✝² : CommGroup α
inst✝¹ : LE α
inst✝ : CovariantClass α α (fun x x_1 => x * x_1) fun x x_1 => x ≤ x_1
a b c d : α
⊢ a / b ≤ c / d ↔ a * d ≤ c * b
simpa only [div_eq_mul_inv] using mul_inv_le_mul_inv_iff'