2. \(\frac{a^{12} \cdot a^6}{a^{18}}\) при \(a=3\)

\(\frac{a^{12} \cdot a^6}{a^{18}} = \frac{a^{12+6}}{a^{18}} = \frac{a^{18}}{a^{18}} = a^{18-18} = a^0 = 1\). Ответ: 1.