ĐKXĐ: \(0\le x\le64\)
\(y'=\frac{1}{6}x^{-\frac{5}{6}}-\frac{1}{6}\left(64-x\right)^{-\frac{5}{6}}=0\)
\(\Leftrightarrow x^{-\frac{5}{6}}=\left(64-x\right)^{-\frac{5}{6}}\Leftrightarrow x=64-x\Leftrightarrow x=32\)
\(y\left(0\right)=2\) ; \(y\left(32\right)=2\sqrt[6]{32}\) ; \(y\left(64\right)=2\)
\(\Rightarrow y_{min}=2\)