$$4.5+6.2 \times 1- \frac{ 3.6 }{ 2 }$$
$8.9$
$$4.5+6.2-\frac{3.6}{2}$$
$$10.7-\frac{3.6}{2}$$
$$10.7-\frac{36}{20}$$
$$10.7-\frac{9}{5}$$
$$\frac{107}{10}-\frac{9}{5}$$
$$\frac{107}{10}-\frac{18}{10}$$
$$\frac{107-18}{10}$$
$$\frac{89}{10}$$
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$\frac{89}{2 \cdot 5} = 8\frac{9}{10} = 8.9$
