a) (a² - 3a)² = (a²)² - 2*a²*3a + (3a)² = a⁴ - 6a³ + 9a²;
б) (1/3x³ + 6x)² = (1/3x³)² + 2*(1/3x³)*(6x) + (6x)² = 1/9x⁶ + 4x⁴ + 36x²;
в) (c² - 0.7c³)² = (c²)² - 2*c²*0.7c³ + (0.7c³)² = c⁴ - 1.4c⁵ + 0.49c⁶;
г) (4y³ - 0.5y²)² = (4y³)² - 2*4y³*0.5y² + (0.5y²)² = 16y⁶ - 4y⁵ + 0.25y⁴;
д) (1 1/2a⁵ + 8a²)² = (3/2a⁵)² + 2*(3/2a⁵)*(8a²) + (8a²)² = 9/4a¹⁰ + 24a⁷ + 64a⁴;
e) (0.6b - 60b²)² = (0.6b)² - 2*0.6b*60b² + (60b²)² = 0.36b² - 72b³ + 3600b⁴.