\(\mathop {\lim }\limits_{x \to 5} \frac{{{x^2} - 12x + 35}}{{3x - 15}}\) bằng:

* Hướng dẫn giải

\(\mathop {\lim }\limits_{x \to 5} \frac{{{x^2} - 12x + 35}}{{3x - 15}} = \mathop {\lim }\limits_{x \to 5} \frac{{\left( {x - 5} \right)\left( {x - 7} \right)}}{{3\left( {x - 5} \right)}} = \mathop {\lim }\limits_{x \to 5} \frac{{x - 7}}{3} = \frac{{ - 2}}{3}\)