а) 3a(a+2) - (a-3) = 3a^2 + 6a - a + 3 = 3a^2 + 5a + 3
б) 8c + 4(1-c)^2 = 8c + 4(1 - 2c + c^2) = 8c + 4 - 8c + 4c^2 = 4c^2 + 4
в) (c+2)(c-3) - (c-1)^2 = c^2 - 3c + 2c - 6 - (c^2 - 2c + 1) = c^2 - c - 6 - c^2 + 2c - 1 = c - 7
а) 3a(a+2) - (a-3) = 3a^2 + 6a - a + 3 = 3a^2 + 5a + 3
б) 8c + 4(1-c)^2 = 8c + 4(1 - 2c + c^2) = 8c + 4 - 8c + 4c^2 = 4c^2 + 4
в) (c+2)(c-3) - (c-1)^2 = c^2 - 3c + 2c - 6 - (c^2 - 2c + 1) = c^2 - c - 6 - c^2 + 2c - 1 = c - 7