\[\boxed{\text{928.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ a³b³ - 1 =\]
\[= (ab - 1)(a^{2}b^{2} + ab + 1)\]
\[\textbf{б)}\ 1 + x³y³ =\]
\[= (1 + xy)(1 - xy + x^{2}y^{2})\]
\[\textbf{в)}\ 8 - a^{3}c^{3} =\]
\[= (2 - ac)(4 + 2ac + a^{2}c^{2})\]
\[\textbf{г)}\ m³n³ + 27 =\]
\[= (mn + 3)(m^{2}n^{2} - 3mn + 9)\]
\[\textbf{д)}\ x^{6}y³ - c^{3} =\]
\[= (x^{2}y - c)(x^{4}y^{2} + x^{2}yc + c^{2})\]
\[\textbf{е)}\ a³ - m^{3}n^{9} =\]
\[= \left( a - mn^{3} \right)\]
\[(a^{2} + amn^{3} + m^{2}n^{6})\ \]