a) 5x(x² + 3x - 2) = 5x * x² + 5x * 3x - 5x * 2 = 5x³ + 15x² - 10x
б) -2a³(4 - a + 7a²) = -2a³ * 4 - 2a³ * (-a) - 2a³ * 7a² = -8a³ + 2a⁴ - 14a⁵
в) (4x²y - 5xy² + 2x) * 0.5xy = 4x²y * 0.5xy - 5xy² * 0.5xy + 2x * 0.5xy = 2x³y² - 2.5x²y³ + x²y
г) -2/3 a²(3 - 1/2 a + 0.6a³) = -2/3 a² * 3 - 2/3 a² * (-1/2 a) - 2/3 a² * 0.6a³ = -2a² + 1/3 a³ - 0.4a⁵
Ответы:
a) 5x³ + 15x² - 10x
б) -8a³ + 2a⁴ - 14a⁵
в) 2x³y² - 2.5x²y³ + x²y
г) -2a² + 1/3 a³ - 0.4a⁵