$$\frac { 1 } { 2 } \times 3 ^ { 3 }$$
$\frac{27}{2}=13.5$
$$\frac{1}{2}\times 27$$
$$\frac{27}{2}$$
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$\frac{3 ^ {3}}{2} = 13\frac{1}{2} = 13.5$
