$${ 2 }^{ 2 } / { 1 }^{ 2 } { 2 }^{ 2 } { 9 }^{ 2 }$$
$1296$
$$\frac{4}{1^{2}}\times 2^{2}\times 9^{2}$$
$$\frac{4}{1}\times 2^{2}\times 9^{2}$$
$$4\times 2^{2}\times 9^{2}$$
$$4\times 4\times 9^{2}$$
$$16\times 9^{2}$$
$$16\times 81$$
$$1296$$
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$2^{4}\times 3^{4}$