求解\(243^{0.8}\)的值。 2025-07-162025-07-16 易林 \[ \begin{align*} 解：243^{0.8} \\ & = (243)^{\frac{4}{5}} \\ & = (3^5)^{\frac{4}{5}} \\ & = (3)^{5 cdot \frac{4}{5}} \\ & = 3^4 \\ & =81 \end{align*} \]