Пошаговое объяснение:
1) 5 +(4а-4) = 5 + 4a - 4 = 1 + 4a
4) (7b - 4) - (4b + 2) = 7b - 4 - 4b - 2 = 3b - 6
2) 17х - (4х - 5) = 17x - 4x + 5 = 13x + 5
5) (5c - d) + (-4d - 5c) = 5c - d - 4d - 5c = -5d
Пошаговое объяснение:
1) 5 +(4а-4) = 5 + 4a - 4 = 1 + 4a
4) (7b - 4) - (4b + 2) = 7b - 4 - 4b - 2 = 3b - 6
2) 17х - (4х - 5) = 17x - 4x + 5 = 13x + 5
5) (5c - d) + (-4d - 5c) = 5c - d - 4d - 5c = -5d