$$2 \frac { 1 } { 2 } \times 5$$
$\frac{25}{2}=12.5$
$$\frac{4+1}{2}\times 5$$
$$\frac{5}{2}\times 5$$
$$\frac{5\times 5}{2}$$
$$\frac{25}{2}$$
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$\frac{5 ^ {2}}{2} = 12\frac{1}{2} = 12.5$
