\(\mathop {\lim }\limits_{x \to {1^ - }} \frac{{{x^3} - 1}}{{\left| {1 - x} \right|}}\) bằng

Câu hỏi :

\(\mathop {\lim }\limits_{x \to {1^ - }} \frac{{{x^3} - 1}}{{\left| {1 - x} \right|}}\) bằng