$$1=\frac{15^{4}\times10^{-6}}{5^{-2}}$$
$\text{false}$
$$1=\frac{50625\times 10^{-6}}{5^{-2}}$$
$$1=\frac{50625\times \frac{1}{1000000}}{5^{-2}}$$
$$1=\frac{\frac{81}{1600}}{5^{-2}}$$
$$1=\frac{\frac{81}{1600}}{\frac{1}{25}}$$
$$1=\frac{81}{1600}\times 25$$
$$1=\frac{81}{64}$$
$$\frac{64}{64}=\frac{81}{64}$$
$$\text{false}$$
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