Question

Срочно правильно!!!!!!

Answer 1

$2(0.7x + y) - 4(2x - y) = 1.4x + 2y - 8x + 4y = \\ = - 6.6x + 6y = - 6.6 \times 5 + 6 \times 3 = - 33 + 18 = - 15$

Ответ:

- 6,6

6

- 15