\[\boxed{\mathbf{1484}\mathbf{.}}\]
\[1)\ y = 2^{x} + \lg(6 - 3x)\]
\[6 - 3x > 0\]
\[- 3x > - 6\]
\[3x < 6\]
\[x < 2.\]
\[Ответ:\ \ x < 2.\]
\[2)\ y = 3^{- x} - 2\ln(2x + 4)\]
\[2x + 4 > 0\]
\[2x > - 4\]
\[x > - 2.\]
\[Ответ:\ \ x > - 2.\]
\[3)\ y = tg\ \frac{x}{4} = \frac{\sin\frac{x}{4}}{\cos\frac{x}{4}}\]
\[\cos\frac{x}{4} \neq 0\]
\[\frac{x}{4} \neq \arccos 0 + \pi n \neq \frac{\pi}{2} + \pi n\]
\[x \neq 4 \bullet \left( \frac{\pi}{2} + \pi n \right) \neq 2\pi + 4\pi n.\]
\[Ответ:\ \ x \neq 2\pi + 4\pi n.\]