52) \(\frac{x^2+y^2}{y(x-y)}-\frac{2x}{x-y}\)

\(\frac{x^2+y^2-2xy}{y(x-y)}=\frac{(x-y)^2}{y(x-y)}=\frac{x-y}{y}\).

Ответ: \(\frac{x-y}{y}\).