Evaluate
81\sqrt{73}\approx 692.064303371
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324\times \frac{\sqrt{1\times 73}}{4}
Multiply 18 and 18 to get 324.
324\times \frac{\sqrt{73}}{4}
Multiply 1 and 73 to get 73.
81\sqrt{73}
Cancel out 4, the greatest common factor in 324 and 4.
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