\[\boxed{\text{384\ (384).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
\[Таблица\ квадратов.\]
Решение.
\[1)\ \sqrt{841} = 29\]
\[2)\ \sqrt{1296} = 36\]
\[3)\ \sqrt{9,61} = 3,1\]
\[4)\ \sqrt{10,24} = 3,2\]
\[5)\ \sqrt{72,25} = 8,5\]
\[6)\ \sqrt{672400} = 820\]
\[\ \]
\[\boxed{\text{3}\text{84}\text{.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[f(x) = \left\{ \begin{matrix} - x - 2;\ \ x < - 1 \\ x^{3};\ \ \ - 1 \leq x \leq 1 \\ - x + 2;\ \ \ \ \ \ x > 1 \\ \end{matrix} \right.\ \]
\[1)\text{\ f}( - 2) = - x - 2 = 2 - 2 = 0;\]
\[f( - 1) = x^{3} = - 1;\]
\[f(0) = x^{3} = 0;\]
\[f(1) = x^{3} = 1;\]
\[f(3) = - x + 2 = - 3 + 2 = - 1.\]
\[2)\ \]
\[3)\ При\ a = - 1;a = 1.\]