\[- \frac{9}{8}xy^{3}z^{4};\]
\[x = \frac{1}{27};\ \ y = - 5;\ \ z = - 2:\]
\[- \frac{9}{8} \cdot \frac{1}{27} \cdot ( - 5)^{3} \cdot ( - 2)^{4} =\]
\[= - \frac{9}{8} \cdot \frac{1}{27} \cdot ( - 125) \cdot 16 =\]
\[= \frac{125 \cdot 2}{3} = \frac{250}{3} = 83\frac{1}{3}\]