$$9.8 / 9 \times 18$$
$19.6$
$$\frac{98}{90}\times 18$$
$$\frac{49}{45}\times 18$$
$$\frac{49\times 18}{45}$$
$$\frac{882}{45}$$
$$\frac{98}{5}$$
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$\frac{2 \cdot 7 ^ {2}}{5} = 19\frac{3}{5} = 19.6$