[tex] \frac{2x}{ {x}^{2} - {y}^{2} } - \frac{1}{x + y} \\ \frac{2x}{(x + y)(x - y)} - \frac{1}{x + y} \\ \frac{2x - (x - y)}{(x + y)(x - y)} \\ \frac{2x - x + y}{(x + y)(x - y)} \\ \frac{x + y}{(x + y)(x - y)} \\ \frac{1}{x - y} [/tex]

x = -2,28; y = 1,72

[tex] \frac{1}{ - 2.28 - 1.72} = - \frac{1}{4} [/tex]

Ответ: -1/4