$$\frac{ 2.7 \times { 10 }^{ -3 } }{ 5.5 \times { 10 }^{ 4 } } =$$
$\frac{27}{550000000}\approx 0.000000049$
$$\frac{2.7}{5.5\times 10^{7}}$$
$$\frac{2.7}{5.5\times 10000000}$$
$$\frac{2.7}{55000000}$$
$$\frac{27}{550000000}$$
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$\frac{3 ^ {3}}{11 \cdot 2 ^ {7} \cdot 5 ^ {8}} = 4.909090909090909 \times 10^{-8}$