Помогите решить пожалуйста

Ответ:

1) -3x(2x - 1) = -6 $x^{2}$ + 3x

2) (2a - b) * 8b + 8b² = 16ab - 8b² +8b² = 16ab

3) (4y - 2) * (-2y) = -4y * 2y - 2 * (-2y) = -8y² - 2 * (-2y) = -8y² + 4y

4) 5a * (a - 2b) + 10ab = 5a² - 10ab + 10ab = 5a²

5) (8a - 3a² + 1) - (a - 3a²) = (8a - 3a² + 1) - a + 3a² = 7a - 3a² + 1 + 3a² = 3a³ - 3a² + 7a + 1

6) (4a² + 9a) - (a² - 1 + 9a) = 4a² + 9a - a² + 1 - 9a = 3a² + 1

7) 16a³ - 2a² * (8a - 3) = 16a³ - 16a³ + 6a² = 6a²

8) 6 $a^{4}$ - 2a²(3a² + a) = 6 $a^{4}$ - 6 $a^{4}$ - 2a³ = -2a³

9) 2ab(a + b) - ab(a - b) = ab(2(a + b) - (a - b)) = ab(2a + 2b - a + b) = ab(a + 3b)

10) xy(x - y) - 2xy(x + y) = xy(x - y - 2(x + y)) = xy(x - y - 2x - 2y)) = xy(-x -3y)