Đáp án:
\[y = \dfrac{{2x - 3}}{{{x^2} - 7x + 10}}\]
ĐK: \[\begin{array}{l}
{x^2} - 7x + 10 \ne 0\\
\Leftrightarrow \left( {x - 5} \right)\left( {x - 2} \right) \ne 0\\
\Leftrightarrow \left\{ \begin{array}{l}
x - 5 \ne 0\\
x - 2 \ne 0
\end{array} \right. \Leftrightarrow \left\{ \begin{array}{l}
x \ne 5\\
x \ne 2
\end{array} \right.
\end{array}\]
TXĐ: \[D = \mathbb{R}\backslash \left\{ {5;2} \right\}\]
