\[Дано:\ \ a > 0\ \ и\ \ b < 0.\]
\[\frac{a}{3} > 0\]
\[- \frac{2}{b} > 0\]
\[\frac{a}{b} < 0\]
\[\frac{a}{b^{2}} > 0\ \]
\[\left( \frac{b}{a} \right)^{2} > 0\]
\[\frac{a^{4}}{b^{3}} < 0\]