1. 3⁻⁴ - (1/5)⁻² = 1 - 5² = 1 - 25 = 1-25*81 = -2024 = -24 ⁸⁰/₈₁
3⁴ 81 81 81
2. (х-у⁻¹) : (х⁻¹ -у) = (х - 1 ) : ( 1 - у) = ху-1 : 1-ху = ху-1 * -х = -х
у х у х у ху-1 у
3. (0,001)⁻³ : 10⁵=(10⁻³)⁻³ : 10⁵=10⁹ : 10⁵ = 10⁴ = 10000
4. (1/6)² а⁻⁵ b⁷ * (1/6)⁻³ a⁷ b⁻⁸ = (1/6)⁻¹ a² b⁻¹ = 6a²
b