$$\frac { 18.43 \times 18.43 - 6.57 \times 6.57 } { 11.86 }$$
$25$
$$\frac{339.6649-6.57\times 6.57}{11.86}$$
$$\frac{339.6649-43.1649}{11.86}$$
$$\frac{296.5}{11.86}$$
$$\frac{29650}{1186}$$
$$25$$
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$5^{2}$