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	Các bình luận về: Cho hàm số \(f(x) = \left\{ {\begin{array}{*{20}{l}}{x\left( {1 + {x^2}} \right)}&#038;{{\rm{ }}khi{\rm{ }}x \ge 3}\\{\frac{1}{{x &#8211; 4}}}&#038;{{\rm{ }}khi{\rm{ }}x &#060; 3}\end{array}} \right.\). Tích phân \(\int\limits_{{{\rm{e}}^2}}^{{{\rm{e}}^4}} {\frac{{f(\ln x)\;}}{x}{\rm{d}}x} \) bằng:	</title>
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