(a-2b)^4-8(a-2b)=(а-2b)(a-2b-2)(a²-4ab+4b²+2a-4b+4)
(x-3y)^4-27x+81y=(x-3y)(x-3y-3)(x²-6xy+9y²+3x-9y+9)
(a-2b)^4-8(a-2b)=(а-2b)(a-2b-2)(a²-4ab+4b²+2a-4b+4)
(x-3y)^4-27x+81y=(x-3y)(x-3y-3)(x²-6xy+9y²+3x-9y+9)