To rewrite the expression \( 5^{-9} 4^{-1/2} \) with positive exponents only, we can use the property of negative exponents which states that \( a^{-n} = \frac{1}{a^n} \).
Starting with the expression:
\[ 5^{-9} 4^{-1/2} \]
We can apply the property to each part:
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For \( 5^{-9} \): \[ 5^{-9} = \frac{1}{5^9} \]
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For \( 4^{-1/2} \): \[ 4^{-1/2} = \frac{1}{4^{1/2}} = \frac{1}{\sqrt{4}} = \frac{1}{2} \]
Now, substituting these into the expression gives us:
\[ 5^{-9} 4^{-1/2} = \frac{1}{5^9} \cdot \frac{1}{2} \]
This can be combined into a single fraction:
\[ \frac{1}{5^9 \cdot 2} \]
Therefore, the expression equivalent to \( 5^{-9} 4^{-1/2} \) with positive exponents only is:
\[ \frac{1}{2 \cdot 5^9} \]