Se aplica formula:
(a - b)³ = a³ - 3a²b + 3ab² - b³
O poti deduce din:
(a - b)³ = (a² - 2ab + b²)(a - b) = a³ - 3a²b + 3ab² - b³
a)
(3t - 2z)³ = (3t)³ - 3(3t)²(2z) + 3(3t)(2z)² - (2z)³ = 27t³ - 54t²z + 36tz² - 8z³
b)
(a² - b²)³ = (a²)³ - 3(a²)²(b²) + 3(a²)(b²)² - (b²)³ = a⁶ - 3a⁴b² + 3a²b⁴ - b⁶