$$9\div18+2$$
$\frac{5}{2}=2.5$
$$\frac{1}{2}+2$$
$$\frac{1}{2}+\frac{4}{2}$$
$$\frac{1+4}{2}$$
$$\frac{5}{2}$$
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$\frac{5}{2} = 2\frac{1}{2} = 2.5$