\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Decompose the function \(f(x)=(2x-1)^3\) into an outer function \(v\) and an inner function \(u\) such that \(f(x)=v(u(x))\).
\(u(x)=\)

\(v(x)=\)