Calculate $$3^{-12} / 3^{-15}$$.

Let's evaluate this expression using exponent rules:

1. We have the expression $$\frac{3^{-12}}{3^{-15}}$$.
2. When dividing exponents with the same base, we subtract the powers in the numerator from the powers in the denominator.
3. So, $$3^{-12 - (-15)} = 3^{-12 + 15}$$.
4. $$-12 + 15 = 3$$.
5. So, the expression simplifies to $$3^3$$.
6. Calculate $$3^3$$: $$3 \times 3 \times 3 = 9 \times 3 = 27$$.

Ответ: 27