\[\boxed{\text{205\ (205).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ S = at\]
\[t = \frac{S}{a};\ \ a \neq 0.\]
\[\textbf{б)}\ v = v_{0} + at\]
\[v - v_{0} = at\]
\[a = \frac{v - v_{0}}{t};\ \ t \neq 0.\ \]
\[\textbf{в)}\ S = \frac{a + b}{2} \cdot h\]
\[2S = (a + b) \cdot h\ \]
\[a + b = \frac{2S}{h}\]
\[b = \frac{2S}{h} - a;\ \ h \neq 0.\]