$${ 1 }^{ 2 } / { 2 }^{ 2 } { 9 }^{ 2 } { 9 }^{ 2 }$$
$\frac{6561}{4}=1640.25$
$$\frac{1^{2}}{2^{2}}\times 9^{4}$$
$$\frac{1}{2^{2}}\times 9^{4}$$
$$\frac{1}{4}\times 9^{4}$$
$$\frac{1}{4}\times 6561$$
$$\frac{6561}{4}$$
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$\frac{3 ^ {8}}{2 ^ {2}} = 1640\frac{1}{4} = 1640.25$
