Ответ:а) -8p⁴ + 12p³ + 4p⁴ - 8p³ + 3p² = -4p⁴ + 4p³ + 3p²б) 2aa² + a² - 3a² + a³ - a = 2a³ + a³ - 2a² - aв) 3xx⁴ + 3xx³ - 5x²x³ - 5x²x = 3x⁵ + 3x⁴ - 5x⁵ - 5x³г) 3a ⋅ 4b² - 0,8b ⋅ 4b² - 2ab ⋅ 3b + b ⋅ 3b² - 1 = 12ab² - 3,2b³ - 6ab² + 3b³ - 1