в) \(\frac{x}{x+y} - \frac{x-y}{x} = \frac{x \cdot x - (x-y) \cdot (x+y)}{x(x+y)} = \frac{x^2 - (x^2-y^2)}{x(x+y)} = \frac{x^2 - x^2 + y^2}{x(x+y)} = \frac{y^2}{x(x+y)}\)
Ответ: \(\frac{y^2}{x(x+y)}\)