c) Pentru X diferit de 0 si 10:
[tex] \frac{X^2-100}{2X^2} * \frac{X^2}{X-10} = \frac{(X-10)(X+10)}{2X^2} * \frac{X^2}{X-10} = \\ = \frac{X+10}{2}[/tex]
f) Pentru X diferit de 2, -2:
[tex](\frac{X^2-4}{X})^{-2} : \frac{X^2+1}{X-2} = (\frac{X}{X^2-4})^2 * \frac{X-2}{X^2+1} = \\ = \frac{X^2}{(X-2)^2(X+2)^2} * \frac{X-2}{X^2+1} = \frac{X^2} {(X-2)(X+2)^2(X^2+1)}[/tex]