$$2\div10\times10^{-1}$$
$\frac{1}{50}=0.02$
$$\frac{1}{5}\times 10^{-1}$$
$$\frac{1}{5}\times \frac{1}{10}$$
$$\frac{1}{50}$$
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$\frac{1}{2 \cdot 5 ^ {2}} = 0.02$