1) 27⁻¹ * 81² * (3⁻³)³ : 81⁻³ = 9⁴
(3³)⁻¹ * (3⁴)² * 3⁻⁹ * (3⁴)³ = (3²)⁴
3⁻³ * 3⁸ + 3⁻⁹ * 3¹² = 3⁸
3⁻³⁺⁸⁻⁹⁺¹² = 3⁸
3⁸ = 3⁸
2) 7⁻² * 21² * (6⁻³)² : 14⁻³ : 343 = 2⁻³ * 9⁻²
7⁻² * 3² * 7² * 2⁻⁶ * 3⁻⁶ * 2³ * 7³ * 7⁻³ = 2⁻³ * 3⁻⁴
7⁻²⁺²⁺³⁻³ * 3²⁻⁶ * 2⁻⁶⁺³ = 2⁻³ * 3⁻⁴
3⁻⁴ * 2⁻³ = 2⁻³ * 3⁻⁴
3) 4⁻¹ * 8² * (a⁻³)³ : (8a⁻³)² = 0,25a⁻³
2⁻² * 2⁶ * a⁻⁹ : (2⁶a⁻⁶) = 2⁻² * a⁻³
2⁴ * a⁻⁹ * 2⁻⁶ * a⁶ = 2⁻² * a⁻³
2⁻² * a⁻³ = 2⁻² * a⁻³
4) a⁻¹ * (ab)² * (b⁻³)³ : b⁻³ = ab⁻⁴
a⁻¹ * a² * b² * b⁻⁹ * b³ = ab⁻⁴
a * b²⁻⁹⁺³ = ab⁻⁴
ab⁻⁴ = ab⁻⁴