Question

прошу помогите даю 60 баллов

Answer 1

Ответ:

52)

-4a + 6b - 3a - 7b = -7a - b

53)

1. a - (4a - 11) + (9 - 2a) = 20 - 5a

a - 4a + 11 + 9 - 2a = 20 - 5a

-5a + 20 = 20 - 5a

20 - 5a = 20 - 5a

2. 6 · (3b - 4) - 5(3b - 11) + 2 = 3b + 33

18b - 24 - 15b + 55 + 2 = 3b + 33

3b + 33 = 3b + 33

3. 10 - 9 · (c - 2/3) + 7c - 16 = -2c

10 - 9c + 6 + 7c - 16 = -2c

-2c = -2c