1) (3x-5y-8v) – (2x+7y-3v) + (5v-11x + y);
$$3x - 5y - 8v - 2x - 7y + 3v + 5v - 11x + y = (3x - 2x - 11x) + (-5y - 7y + y) + (-8v + 3v + 5v) = -10x - 11y$$
Ответ: $$-10x - 11y$$