$$2\frac{4}{2}+3\frac{6}{4}$$
$\frac{17}{2}=8.5$
$$\frac{4+4}{2}+\frac{3\times 4+6}{4}$$
$$\frac{8}{2}+\frac{3\times 4+6}{4}$$
$$4+\frac{3\times 4+6}{4}$$
$$4+\frac{12+6}{4}$$
$$4+\frac{18}{4}$$
$$4+\frac{9}{2}$$
$$\frac{8}{2}+\frac{9}{2}$$
$$\frac{8+9}{2}$$
$$\frac{17}{2}$$
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$\frac{17}{2} = 8\frac{1}{2} = 8.5$