Question

ЗДЕЛАЙТЕ пж дай все бали ржжж

Answer 1

$- (a - b + c) = - a + b - c$

$12 - ( - 3 + x - y) = 12 + 3 - x + y = 15 - x + y$

$m - (n + m) = m - n - m = - n$

$2x + (6y - 7z - 2x) = 2x + 6y - 7z - 2x = 6y - 7z$

$2x - (5x - 4y) + (3x - 3y) = 2x - 5x + 4y + 3x - 3y = y$