Question

Решите примеры срочно!!
4/x+4-x/x-4=

Answer 1

$\frac{4}{x+4} -\frac{x}{x-4} =\\=\frac{4(x-4)-x(x+4)}{(x+4)(x-4)} =\\=\frac{4x-16-x^2-4x}{x^2-16} =\\=\frac{-16-x^2}{x^2-16} =-\frac{16+x^2}{x^2-16}$