Answers: 1
![Use:\\a^{-n}=\left(\frac{1}{a}\right)^n\\\\a^\frac{m}{n}=(\sqrt[n]{a})^m\\\\8^{-\frac{2}{3}}=\left(\frac{1}{8}\right)^\frac{2}{3}=\left(\sqrt[3]{\frac{1}{8}}\right)^2=\left(\frac{1}{2}\right)^2=\boxed{\frac{1}{4}}](/tpl/images/0187/2536/746a4.png)
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