Solution
= $$26.4 \times 12.5 + \sqrt{22^{2} + 20 + 11^{2}} - 31$$
= $$26.4\times12.5+\sqrt{484+20+121}-31$$
= $$26.4\times12.5+\sqrt{625}-31$$= $$330+25-31$$
= $$330-6$$
= 324
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