$$\frac { 2 } { 1 ^ { 2 } + 2 ^ { 2 } + 2 ^ { 2 } }$$
$\frac{2}{9}\approx 0.222222222$
$$\frac{2}{1+2^{2}+2^{2}}$$
$$\frac{2}{1+4+2^{2}}$$
$$\frac{2}{5+2^{2}}$$
$$\frac{2}{5+4}$$
$$\frac{2}{9}$$
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$\frac{2}{3 ^ {2}} = 0.2222222222222222$
