\[\boxed{\text{698\ (698).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[x^{9} - 6x^{3}y^{2} - y^{6} =\]
\[= \left( x^{9} - y^{6} \right) - 6x^{3}y^{2} =\]
\[= 2 \cdot \left( x^{6} + x^{3}y^{2} + y^{4} \right) - 6x^{3}y^{2} =\]
\[= 2x^{6} + 2x^{3}y^{2} + 2y^{4} - 6x^{3}y^{2} =\]
\[= 2x^{6} - 4x^{3}y^{2} + 2y^{4} =\]
\[= 2 \cdot \left( x^{3} - y^{2} \right)^{2} =\]
\[= 2 \cdot 2^{2} = 2 \cdot 4 = 8\]
\[Ответ:8.\]