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2) 4⁻⁹ : 4⁻⁶ = 4⁻⁹ x 4⁶ = 4⁻⁹⁺6 = 4⁻³ = 1/(4³) = 1/64
3) (a⁻³ x b⁻¹)⁻⁴ = a¹² b⁴
4) (x⁻⁴ : y⁻²)⁻³ = x¹² : y⁶ = x¹² y⁻⁶
5) (a² b⁵)⁴ = a⁸ b²⁰