Tính Lim x^2} - 12x + 35}} / {{25 - 5x}}\).

Chọn A

\(\mathop {\lim }\limits_{x \to 5} {\mkern 1mu} \frac{{{x^2} - 12x + 35}}{{25 - 5x}} = \mathop {\lim }\limits_{x \to 5} \frac{{\left( {x - 5} \right)\left( {x - 7} \right)}}{{5.(5 - x)}} = \mathop {\lim }\limits_{x \to 5} \frac{{x - 7}}{{ - 5}} = \frac{{5 - 7}}{{ - 5}} = \frac{2}{5}\)