$$1.5\frac{1}{2}\div\frac{1}{6}$$
$12$
$$\frac{\left(1.5\times 2+1\right)\times 6}{2}$$
$$\frac{\left(3+1\right)\times 6}{2}$$
$$\frac{4\times 6}{2}$$
$$\frac{24}{2}$$
$$12$$
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$3\times 2^{2}$
