Question

Доведіть тотожність:
1) 2b(-4) + 8b – 4 = -4;
2) 2x – 1 – 5(1 – 2х) = 12х – 6;
3) a – (4a – 3b) = 3(b – a);
4) 2c = 12c – 5(2c + 3) + 15.
CРОЧНО!!!!!!!!!

Answer 1

Ответ:

.

Объяснение:

1) 2b(-4) + 8b – 4 = -4.

-8b + 8b = 0;

0 = 0.

2) 2x – 1 – 5(1 – 2х) = 12х – 6.

2x – 1 – 5 + 10x = 12x – 6;

12x – 6 = 12x – 6.

4) 2c = 12c – 5(2c + 3) + 15.

2c = 12c – 10c – 15+15;

2c = 2c.