\[\left( x^{2} - 3x \right)(4x + 2) \geq 0\]
\[4x(x - 3)\left( x + \frac{1}{2} \right) \geq 0\]
\[Ответ:\lbrack - 0,5;0\rbrack \cup \lbrack 3; + \infty).\]
\[\frac{x + 4}{x - 1} > 0\]
\[Ответ:( - \infty; - 4) \cup (1; + \infty).\]