The square roots of 81 are integers, not fractions. So there are no sensible ways to express them as fractions.
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The square root of 81 is ±9 which is in its simplest form.
The square root of -81 = 9 i9i
The square root of 81 is 9
The square root of 6561 is 81
The square root of 81 squared is 81.