Nếu ${\log 2}\left( {{{\log }8}x} \right) = {\log 8}\left( {{{\log }2}x} \right)$ thì ${\left( {{{\log }2}x} \right)^2}$ bằng

"> "> Nếu ${\log 2}\left( {{{\log }8}x} \right) = {\log 8}\left( {{{\log }2}x} \right)$ thì ${\left( {{{\log }2}x} \right)^2}$ bằng