\[\boxed{\text{206\ (206).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ a^{6} \cdot \ * = a^{14};\ \ \]
\[14 - 6 = 8;\ \ \]
\[a^{6} \cdot a^{8} = a^{14}.\]
\[\textbf{б)}*\ \cdot a^{6} = a^{7};\ \ \]
\[7 - 6 = 1;\ \ \]
\[a \cdot a^{6} = a^{7}.\]
\[\textbf{в)}\ a^{10} \cdot \ *\ \cdot a^{2} = a^{18};\ \ \]
\[18 - 10 - 2 = 6;\ \ \]
\[a^{10} \cdot a^{6} \cdot a^{2} = a^{18}.\]