Решебник по алгебре 9 класс Мерзляк Задание 698

\[\boxed{\mathbf{698\ (698).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\text{\ a}_{1} = 4,\ \ a_{n + 1} = a_{n} + 3\]

\[a_{2} = 4 + 3 = 7\]

\[a_{3} = 7 + 3 = 10\]

\[a_{4} = 10 + 3 = 13\]

\[a_{5} = 13 + 3 = 16\]

\[2)\ a_{1} = - 2,\ \ a_{2} = 6,\ \ \]

\[a_{n + 2} = 3a_{n} + a_{n} + 1\]

\[a_{3} = 3 \cdot ( - 2) + 6 = 0\]

\[a_{4} = 3 \cdot 6 + 0 = 18\]

\[a_{5} = 3 \cdot 0 + 18 = 18\]