Question

5(0,2-0,6)-4(1,25х+0,5)=
Якщо х=(-2)
а- 9
б- (-9)
в- 3
Помогиите пжжжжж. Даю 15 балов

Answer 1

Ответ:

$5 \times (0.2 - 0.6) - 4 \times (1.25x + 0.5) = \\ = 5 \times ( - 0.4) - 5x - 2 = \\ = - 2 - 5x - 2 = \\ = - 5x - 4 \\ \\ x = - 2 \\ - 5 \times ( - 2) - 4 = 6$