\[\boxed{\text{479\ (479).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ x^{6}y^{12} = \left( x^{2}y^{4} \right)^{3} = \left( x^{3}y^{6} \right)^{2}\ \]
\[\textbf{б)}\ 1\ 000\ 000m^{18} = \left( 100m^{6} \right)^{3} =\]
\[= \left( 1000m^{9} \right)^{2}\text{\ \ }\]