Question

ПОМОГИТЕ Пожалуйста ​

Answer 1

Ответ:

$4a(x - 6) = 4ax - 24x \\ - 5x(4a + 5) = - 20ax - 25x \\ 3b(5a - 2b - 7) = 15ab - 6 {b}^{2} - 21b$

$3x(4x - 1) - 2x(4x + 5) = \\ = 14 {x}^{2} - 3x - 8 {x}^{2} - 10x = \\ = 6 {x}^{2} - 13x = \\ = x(6x - 13)$

$3n(n - 2) - 4n(2n + 3) + 5n(n + 2) = \\ = 3 {n}^{2} - 6n - 8 {n}^{2} - 12n + 5 {n}^{2} + 10n = \\ = - 8n$

$- 8 \times ( - 2.5) = 20$