\[\boxed{\text{552\ (552).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ под\ графиком\ функции\ \]
\[y = x;\]
\[\textbf{б)}\ над\ графиком\ функции\ \]
\[y = x.\]
\[\boxed{\text{552.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ c_{n} = c_{1} + d(n - 1)\]
\[c_{36} = 26;\ \ d = 0,7:\ \ \]
\[c_{1} = c_{n} - d(n - 1) =\]
\[= 26 - 0,7 \cdot 35 = 1,5.\]
\[\textbf{б)}\ c_{n} = c_{1} + d(n - 1)\]
\[c_{1} = - 10;\ \ c_{15} = 1,2:\]
\[d = \frac{c_{n} - c_{1}}{n - 1} = \frac{1,2 + 10}{1,4} = 0,8.\]