$$1.8/0.3-4.02 \times 2+6.5$$
$4.46$
$$\frac{18}{3}-4.02\times 2+6.5$$
$$6-4.02\times 2+6.5$$
$$6-8.04+6.5$$
$$-2.04+6.5$$
$$4.46$$
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$\frac{223}{2 \cdot 5 ^ {2}} = 4\frac{23}{50} = 4.46$
