Question

решите.....................

Answer 1

Номер 1.
а)
$6p + 8q - 9p - 3q = 5q - 3p$
б)
$7y + (4 - 2y) - (12 + 9y) = \\ = 7y + 4 - 2y - 12 - 9y = \\ = - 4y - 8$
в)
$2 - 6(7x + 3) = 2 - 42x - 18 = \\ = - 16 - 42x$
Номер 2.
а)
$7x + 43.4 = 0 \\ 7x = - 43.4 \\ x = - 6.2$
б)
$3(0.8x + 1.7) - 3.1 = 2.6x \\ 2.4x + 5.1 - 3.1 = 2.6x \\ 2.4x - 2.6x = 3.1 - 5.1 \\ 0.2x = - 2 \\ x = - 10$