a) (6-4b)(2b+1) = 12b - 8b^2 + 6 - 4b = -8b^2 + 8b + 6
б) (x+x^2-1)(3-x) = 3x - x^2 + 3x^2 - x - 3 + x = 2x^2 + 2x - 3
в) (c^2-c-1)(c^3+c+2) = c^5 + c^3 + 2c^2 - c^4 - c^2 - 2c - c^3 - c - 2 = c^5 - c^4 - 2c + c^2 - 3
a) (6-4b)(2b+1) = 12b - 8b^2 + 6 - 4b = -8b^2 + 8b + 6
б) (x+x^2-1)(3-x) = 3x - x^2 + 3x^2 - x - 3 + x = 2x^2 + 2x - 3
в) (c^2-c-1)(c^3+c+2) = c^5 + c^3 + 2c^2 - c^4 - c^2 - 2c - c^3 - c - 2 = c^5 - c^4 - 2c + c^2 - 3