To rewrite the expression \( \frac{5^{-9}}{4^{-12}} \) with positive exponents, we can use the property of negative exponents, which states that \( a^{-n} = \frac{1}{a^n} \).
Starting with the expression:
\[ \frac{5^{-9}}{4^{-12}} \]
We can rewrite this using the property of negative exponents:
\[ = \frac{1}{5^9} \cdot \frac{4^{12}}{1} \]
This simplifies to:
\[ = \frac{4^{12}}{5^9} \]
Now, we have an expression with positive exponents only:
\[ \frac{4^{12}}{5^9} \]
This is the final equivalent expression with positive exponents.