Question

Помогите пожалуйста я дам 18б.

Answer 1

$1) \\ {a}^{5} ( - 2a - 2) - 2 {a}^{6} = \\ = - 2 {a}^{6} - 2 {a}^{5} - 2 {a}^{6} = - 4 {a}^{6} - 2 {a}^{5} \\ a( - \frac{1}{2} ) = - 4 \times ( - \frac{1}{2} ) {}^{6} - 2 \times ( - \frac{1}{2} ) {}^{5} = - 4 \times \frac{1}{64} - 2 \times ( - \frac{1}{32} ) = - \frac{1}{16} + \frac{1}{16} = 0$
$2) - 0.6(2 - x) = 0.7(x + 1) \\ - 1.2 + 0.6x = 0.7x + 0.7 \\ - 0.1x = 1.9 \\ x = - 19$