Question

СРОЧНО РЕШИТЕ! ДАЮ 35 БАЛЛОВ!

Answer 1

$displaystyle left({frac{a+ x}{x}}^{setminus cdot (x-a)} - {frac{2x}{x - a}}^{setminus cdot x} right) cdot frac{x - a}{a^{2} + x^{2}} = frac{(a + x)(x - a) - 2x^{2}}{x(x - a)} cdot frac{x - a}{a^{2} + x^{2}} =\= frac{x^{2} - a^{2} - 2x^{2}}{x} cdot frac{1}{a^{2} + x^{2}} = frac{-(a^{2} + x^{2})}{x(a^{2} + x^{2})} = -frac{1}{x}$