\[- 3\frac{1}{5}a^{8}b\left( \frac{1}{2}a^{3}b^{8} \right)^{4} =\]
\[= - \frac{16}{5} \cdot \frac{1}{2^{4}}a^{8}b \cdot a^{12}b^{32} =\]
\[= - \frac{16}{5} \cdot \frac{1}{16}a^{20}b^{33} = - \frac{1}{5}a^{20}b^{33} =\]
\[= - 0,2a^{20}b^{33}\]