\[\boxed{\text{674.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
Пояснение.
Решение.
\[\textbf{а)}\ a² + a = a(a + 1)\]
\[\textbf{б)}\ x³ - x^{2} = x²(x - 1)\]
\[\textbf{в)}\ c^{5} + c^{7} = c^{5}(1 + c^{2})\]
\[\textbf{г)}\ a³ - a^{7} = a³(1 - a^{4})\]
\[\textbf{д)}\ 3m² + 9m³ = 3m²(1 + 3m)\]
\[\textbf{е)}\ 9p³ - 8p = p(9p^{2} - 8)\]
\[\textbf{ж)}\ 4c² - 12c^{4} = 4c²(1 - 3c^{2})\]
\[\textbf{з)}\ 5x^{5} - 15x^{3} = 5x³(x^{2} - 3)\]
\[\textbf{и)} - 12y^{4} - 16y =\]
\[= - 4y \cdot (3y^{3} + 4)\]