$$55 \div 11 [ 120 \div 2 \{ 4 + ( 10 + 5 - 7 ) \} ]$$
$3600$
$$5\times \frac{120}{2}\left(4+10+5-7\right)$$
$$5\times 60\left(4+10+5-7\right)$$
$$300\left(4+10+5-7\right)$$
$$300\left(14+5-7\right)$$
$$300\left(19-7\right)$$
$$300\times 12$$
$$3600$$
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$2^{4}\times 3^{2}\times 5^{2}$
