а) b^8 - b^5 - b^3 + 1 = (b^8 - b^5) - b^3 + 1 = b^5(b^3 - 1) - b^3 + 1 = b^5(b - 1)(b^2 + b + 1) - b^3 + 1
б) b^6 - b^5 - b + 1 = b^5(b - 1) - b + 1 = b^5(b - 1) - (b - 1) = (b^5 - 1)(b - 1) = (b^3 + 1)(b^2 - b + 1)(b - 1)
а) b^8 - b^5 - b^3 + 1 = (b^8 - b^5) - b^3 + 1 = b^5(b^3 - 1) - b^3 + 1 = b^5(b - 1)(b^2 + b + 1) - b^3 + 1
б) b^6 - b^5 - b + 1 = b^5(b - 1) - b + 1 = b^5(b - 1) - (b - 1) = (b^5 - 1)(b - 1) = (b^3 + 1)(b^2 - b + 1)(b - 1)