Разложения степеней:
1. (1 + a)^3 = (1 + a)(1 + a)(1 + a) = 1 + 3a + 3a^2 + a^3
2. (x - 5)^4 = (x - 5)(x - 5)(x - 5)(x - 5) = x^4 - 20x^3 + 150x^2 - 500x + 625
3. (2c - 3)^5 = (2c - 3)(2c - 3)(2c - 3)(2c - 3)(2c - 3) = 32c^5 - 240c^4 + 720c^3 - 1080c^2 + 810c - 243.