6. (x-1)⁷ = C(7,0) * x⁷ * (-1)⁰ + C(7,1) * x⁶ * (-1)¹ + C(7,2) * x⁵ * (-1)² + C(7,3) * x⁴ * (-1)³ + C(7,4) * x³ * (-1)⁴ + C(7,5) * x² * (-1)⁵ + C(7,6) * x¹ * (-1)⁶ + C(7,7) * x⁰ * (-1)⁷
= x⁷ - 7x⁶ + 21x⁵ - 35x⁴ + 35x³ - 21x² + 7x - 1
Ответ: $$x^7 - 7x^6 + 21x^5 - 35x^4 + 35x^3 - 21x^2 + 7x - 1$$