\[y = \frac{x^{2} - 3x + 2}{x^{2} + 3x + 2}.\]
\[= \frac{6x^{2} - 12}{\left( x^{2} + 3x + 2 \right)^{2}} =\]
\[= \frac{6\left( x^{2} - 2 \right)}{\left( x^{2} + 3x + 2 \right)^{2}}.\]
\[2)\ x^{2} - 2 \geq 0\]
\[\left( x + \sqrt{2} \right)\left( x - \sqrt{2} \right) \geq 0\]
\[x \leq - \sqrt{2};\ \ \ x \geq \sqrt{2}.\]
\[x = \sqrt{2} - точка\ минимума;\]
\[x = - \sqrt{2} - точка\ максимума.\]