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	Các bình luận về: Cho hàm số \(f(x) = \left\{ \begin{array}{l}{x^4} + 2{x^2} &#8211; 1\,\,\,\,\,{\rm{khi }}x &#060; 1\\3 &#8211; {x^2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{khi }}x \ge 1\end{array} \right.\). Tính tích phân \(\int\limits_1^{{e^4}} {f\left( {\sqrt {4 &#8211; \ln x} } \right)} \frac{1}{x}{\rm{d}}x\).	</title>
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