\[12x^{2}y^{2}z \cdot \left( - \frac{3}{4} \right)xy^{2}z^{2} \cdot ( - 0,1)x^{2}yz^{2} =\]
\[= 0,9x^{2 + 1 + 2}y^{2 + 2 + 1}z^{1 + 2 + 2} =\]
\[= 0,9x^{5}y^{5}z^{5}.\]