\[\boxed{\text{533\ (533).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ c^{2} \cdot c^{3} = c^{5}\]
\[\textbf{б)}\ c^{4} \cdot c^{5} = c^{9}\]
\[\textbf{в)}\ c^{6} \cdot c^{5} = c^{11}\]
\[\textbf{г)}\ c^{4} \cdot c^{11} = c^{15}\text{\ \ }\]