\[\boxed{\text{921.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ x³ + y³ =\]
\[= (x + y)(x^{2} - xy + y^{2})\]
\[\textbf{б)}\ m³ - n^{3} =\]
\[= (m - n)(m^{2} + mn + n^{2})\]
\[\textbf{в)}\ 8 + a³ =\]
\[= (2 + a)(4 - 2a + a^{2})\]
\[\textbf{г)}\ 27 - y^{3} =\]
\[= (3 - y)(9 + 3y + y^{2})\]
\[\textbf{д)}\ t³ + 1 = (t + 1)(t^{2} - t + 1)\]
\[\textbf{е)}\ 1 - c^{3} = (1 - c)(1 + c + c^{2})\]