$$15/4 \times 12-9 \times 2+18/2$$
$36$
$$\frac{15\times 12}{4}-9\times 2+\frac{18}{2}$$
$$\frac{180}{4}-9\times 2+\frac{18}{2}$$
$$45-9\times 2+\frac{18}{2}$$
$$45-18+\frac{18}{2}$$
$$27+\frac{18}{2}$$
$$27+9$$
$$36$$
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$2^{2}\times 3^{2}$
