Question

Ребята, решите , срочно!!!!!

Answer 1

1)y/(x-y)+x/(x+y)=(xy+y²+x²-xy)/(x²-y²)=(x²+y²)/(x²-y²)
2)1/x²+1/y²=(y²+x²)/x²y²
3)(x²+y²)/(x²-y²):(y²+x²)/x²y²=(x²+y²)/(x²-y²) * x²y²/(y²+x²)=x²y²/(x²-y²)
4)x²y²/(x²-y²) -y^4/(x²-y²)=(x²y²-y^4)/(x²-y²)=y²(x²-y²)/(x²-y²)=x²

Answer 2

подробное решение в приложении