\(\mathop {\lim }\limits_{x \to 2} \frac{{{x^2} - 3x + 2}}{{2x - 4}}\) có giá trị là bao nhiêu?

* Hướng dẫn giải

\(\begin{array}{l}
\mathop {\lim }\limits_{x \to 2} \frac{{{x^2} - 3x + 2}}{{2x - 4}} = \mathop {\lim }\limits_{x \to 2} \frac{{\left( {x - 2} \right)\left( {x - 1} \right)}}{{2\left( {x - 2} \right)}}\\
 = \mathop {\lim }\limits_{x \to 2} \frac{{x - 1}}{2} = \frac{1}{2}
\end{array}\)