Question

пжжж помогите срочно нужно​

Answer 1

Ответ:

$- 20a + 40 + 18a = - 2a + 40 = - 100 + 40 = - 60$

$9.4b - 13 - 10b = - 0.6b - 13 = - 9 - 13 = - 22$

$- 14 \times \frac{1}{7} c + 18 \times \frac{2}{7} c - 12 = 4 \times \frac{1}{7} c - 12 = - \frac{29}{5} - 12 = - \frac{89}{5}$

$9x - 10y + 16x + 9y = 25x - y = - 20 - 2.5 = - 22.5$

$- 1.4a + 31b - 2.6a + 4b = - 4a + 35b = - 5.6 - 7 = - 12.7$