1)(х+у)⁻³ = (1/(х+у))³ = 1/(х+у)³ или = 1/(х³+3х²у+3ху²+у³).
2)4(а-2с)⁻⁴ = 4(1/(а-2с))⁴ = 4 * 1/(а-2с)⁴ = 4/(а-2с)⁴.
3)(а²-b²)⁻¹ * (a⁻¹+y⁻¹) = 1/(a²-b²) * 1/(a+y) = 1/(a²-b²) * 1/(a+y) = 1/(a²-b²)(a+y).
4) (3⁻²+a⁻³) * (3-a)⁻² = 1/(3²+a³) * 1/(3-a)² = 1/(9+a³) * 1/(9-6a+a²) =
1/(9+a³)(9-6a+a²).