Question

Решите lim(x->1)x^2-1/x-1

Answer 1

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