$$5 \times 3+ \frac{ 1 }{ 2 } \times 12 \times { 3 }^{ 2 }$$
$69$
$$15+\frac{1}{2}\times 12\times 3^{2}$$
$$15+\frac{12}{2}\times 3^{2}$$
$$15+6\times 3^{2}$$
$$15+6\times 9$$
$$15+54$$
$$69$$
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$3\times 23$
