\[\boxed{\text{470\ (470).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[6a^{2}b^{3} = - 2a \cdot \left( - 3ab^{3} \right) =\]
\[= 6ab^{2} \cdot ab = 2ab \cdot 3ab^{2} =\]
\[= 3b \cdot 2a^{2}b^{2} =\]
\[= - ab \cdot \left( - 6ab^{2} \right) =\]
\[= - a^{2}b \cdot \left( - 6b^{2} \right)\]