\[\boxed{\mathbf{887\ (887).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ y = \frac{4x + 12}{x² + 3x} = \frac{4 \cdot (x + 3)}{x(x + 3)} = \frac{4}{x}\]
\[y = \frac{4}{x},\ \ x \neq - 3\]
\[2)\ y = \frac{32 - 2x^{2}}{x^{3} - 16x} =\]
\[= \frac{2 \cdot \left( 16 - x^{2} \right)}{x\left( x^{2} - 16 \right)} = - \frac{2}{x}\]
\[y = - \frac{2}{x},\ \ x \neq 4,\ \ x \neq - 4\]