Question

СРОЧНО ПРОШУ ЗДЕЛАЙТЕ 2

Answer 1

$- 2.3a \times ( - 5b) = 11.5ab$

$10a - a - 7b + 3b = \\ (10 - 1)a + ( - 7 + 3)b = \\ 9a - 4b$

$a + (a - 6) - (15 + a) = \\ a + a - 6 - 15 - a = a - 21$

$- 4(b - 2) + 8(b + 4) = \\ - 4b + 8 + 8b + 32 = \\ 4b + 40$