1) -(1/3 xy³)² * (-3x)³ = -1 * x² y⁶ * (-3³ x³) = 3x⁵y⁶
3²
2) (-2a³b)³ * (-2b) = -8a⁹b³ * (-2b) = 16a⁹ b⁴
3) (14/15)⁴ * (3/7)⁴ * (2.5)³ = 2⁴ * 7⁴ * 3⁴ * 5³ = 2/5 =0.4
3⁴ * 5⁴ 7⁴ 2³
4) a³⁵ * a¹⁹ : (a⁵² * a²) = a³⁵⁺¹⁹ = a⁵⁴ =1
a⁵²⁺² a⁵⁴
5) 0.2 * (-5)² - 3³ = 1/5 * 5² - 3³ = 5-27=-22
6) (m³)⁵ (n⁴)³ = m³ * n¹² = m³ n²
(m³)⁴ (n⁵)² n¹⁰
7) 3⁶ * 9⁻² * 5⁴ - 9*125*(1/5)⁻¹ =
=3⁶ * 3⁻⁴ * 5⁴ - 3² * 5³ * 5 =
=3² * 5⁴ - 3² * 5⁴ =0