![a^\frac{n}{m}=\sqrt[m]{a^n}\\\\\\81^\frac{1}{2}=\sqrt{81}=9\\\\\\81^\frac{1}{2}=(9^2)^\frac{1}{2}=9^{2\cdot\frac{1}{2}}=9](/tpl/images/0180/7909/06a60.png)
Simplify 81^1/2
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