(x+y)/(x-y)
Объяснение:
=((x²+y²)/x²y² + 2/xy) * x²y²/x²-y² =
=((x²+y²+2xy)/x²y² * x²y²/x²-y² =
=(x+y)²/x²-y² = (x+y)/(x-y)
