Question

помогите решить плиз!

Answer 1

(a-3b)(a+3b)(a²+9b²)(a⁴+81b⁴)+3⁸b⁸=(a²-9b²)(a²+9b²)(a⁴+3⁴b⁴+3⁸b⁸=
=(a⁴-3⁴b⁴)(a⁴+3⁴b⁴)+3⁸b⁸=a⁸-3⁸b⁸+3⁸b⁸=a⁸.
x+2x²-y-2y²=(x-y)+2(x²-y²)=(x-y)+2(x-y)(x+y)=(x-y)(2x+2y+1).

Answer 2

спасибо sangers!