$$(3^{-2}\times5^{-2})^{-2}$$
$50625$
$$\left(\frac{1}{9}\times 5^{-2}\right)^{-2}$$
$$\left(\frac{1}{9}\times \frac{1}{25}\right)^{-2}$$
$$\left(\frac{1}{225}\right)^{-2}$$
$$50625$$
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$3^{4}\times 5^{4}$
