\[10 \cdot \left( \frac{1}{5} \right)^{2} - 12 \cdot \frac{1}{5} =\]
\[= \frac{1}{5}\left( 10 \cdot \frac{1}{5} - 12 \right) = \frac{1}{5}(2 - 12) =\]
\[= \frac{1}{5} \cdot ( - 10) = - 2.\]