Ответ:
1. 90m
2. 35z
6. 10(5x + 9)
8. 8(30b+7)
Пошаговое объяснение:
2. 276m - (172m + 14m) = 276m - 172m - 14m = 90m
4. 26z + (13z - 5z) + z = 26z + 13z - 5z + z = 35z
6. 42x + 45 + 8x + 45 = 50x + 90 = 10(5x + 9)
8. 204b + 30b + 6b + 56 = 240b + 56 = 8(30b + 7)