a) (1/6 x⁻⁴ y³)⁻¹ = (1/6)⁻¹ * (x⁻⁴)⁻¹ * (y³)⁻¹ = 6 * x⁴ * y⁻³ = (6x⁴)/y³
б) ((3a⁻⁴)/(2b⁻³))⁻² * 10a⁷b³ = (3a⁻⁴)⁻² / (2b⁻³)⁻² * 10a⁷b³ = (3⁻² * a⁸) / (2⁻² * b⁶) * 10a⁷b³ = (a⁸ * 4)/(9b⁶) * 10a⁷b³ = (40a¹⁵)/(9b³)
Ответ: а) (6x⁴)/y³; б) (40a¹⁵)/(9b³)