в) 4y - (3y - (2y - (y+1))) = 4y - (3y - (2y - y - 1)) = 4y - (3y - (y - 1)) = 4y - (3y - y + 1) = 4y - (2y + 1) = 4y - 2y - 1 = 2y - 1
Ответ: $$2y-1$$
г) 5c - (2c - ((b-c) - 2b)) = 5c - (2c - (b - c - 2b)) = 5c - (2c - (-b - c)) = 5c - (2c + b + c) = 5c - (3c + b) = 5c - 3c - b = 2c - b
Ответ: $$2c-b$$