2.
定义在\((0,\)\(+\)\(∞\)\()\)内的函数\(f\)\((\)\(x\)\()\)满足\(f\)\((\)\(x\)\()\)\( > \)\(0\),且\(2\)\(f\)\((\)\(x\)\()\)\( < xfˈ\)\((\)\(x\)\()\)\( < \)\(3\)\(f\)\((\)\(x\)\()\)对\(x\)\(∈(0,\)\(+\)\(∞\)\()\)恒成立,其中\(fˈ\)\((\)\(x\)\()\)为\(f\)\((\)\(x\)\()\)的导函数,则\((\) \()\)