Question

помогите решить первое задание первого варианта прошу....

Answer 1

(x-y)(x²+xy+y²)/(x+y)(x²-xy+y²) *(x²-xy+y²)/(x-y)=(x²+xy+y²)/(x+y)

(a²-b²)(a^4+a²b²+b^4)/(a²+b²)(a^4-a²b²+b^4) *(a²+b²)²/(a^4+a²b²+b^4)=
=(a²-b²)(a²+b²)/(a^4-a²b²+b^4)=(a^4-b^4)/(a^4-a²b²+b^4)