Question

1)
решите пжлст правильно​

Answer 1

Ответ:

$3-x^{2}$

Пошаговое объяснение:

$\displaystyle 1)(x^{2} -1)(\frac{1}{x-1} -\frac{1}{x+1} -1)=$

$\displaystyle=(x^{2} -1)(\frac{x+1}{(x-1)(x+1)} -\frac{x-1}{(x-1)(x+1)} -\frac{(x-1)(x+1)}{(x-1)(x+1)} )=$

$\displaystyle=(x^{2} -1)(\frac{x+1-x+1-x^{2} +1}{(x-1)(x+1)} =(x^{2} -1)(\frac{3-x^{2} }{(x-1)(x+1)} )=\displaystyle$

$\displaystyle=(x^{2} -1)*\frac{3-x^{2} }{x^{2} -1} =3-x^{2}$