\[\boxed{\mathbf{562\ (562).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ |9,806 - 9| = 0,806\]
\[2)\ |9,806 - 9,8| = 0,006\]
\[3)\ |9,806 - 9,81| = | - 0,004| =\]
\[= 0,004\]
\[4)\ |9,806 - 10| = | - 0,194| =\]
\[= 0,194\]
\[\boxed{\mathbf{562.\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[b_{5} = 11,\ \ b_{11} = - 7\]
\[\left\{ \begin{matrix} b_{1} + 4d = 11\ \ \\ b_{1} + 10d = - 7 \\ \end{matrix} \right.\ \text{\ \ }( - )\text{\ \ \ }\]
\[\left\{ \begin{matrix} - 6d = 18\ \ \ \ \ \\ b_{1} = 11 - 4d \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\ \left\{ \begin{matrix} d = - 3\ \ \ \ \ \ \ \ \ \ \\ b_{1} = 11 + 12 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\left\{ \begin{matrix} d = - 3 \\ b_{1} = 23 \\ \end{matrix} \right.\ \]
\[Ответ:b_{1} = 23.\]