The value of $$\frac{18.43 \times 18.43 - 6.57 \times 6.57}{11.86}$$ is:
$$\frac{18.43 \times 18.43 - 6.57 \times 6.57}{11.86}$$
$$\frac{18.43^{2}-6.57^{2}}{11.86}$$
$$\frac{(18.43+6.57)(18.43 - 6.57)}{11.86}$$
$$\frac{25\times11.86}{11.86}=25$$
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