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	Các bình luận về: Cho hai hàm \(f\left( x \right)\) và\(g\left( x \right)\) có đạo hàm trên \(\left[ {1;4} \right]\), thỏa mãn \(\left\{ {\begin{array}{*{20}{c}}{f\left( 1 \right) + g\left( 1 \right) = 4}\\{g\left( x \right) =&#160; &#8211; xf&#8217;\left( x \right)}\\{f\left( x \right) =&#160; &#8211; xg&#8217;\left( x \right)}\end{array}} \right.\) với mọi



\(x \in \left[ {1;4} \right]\). Tính tích phân \(I = \int\limits_1^4 {\left[ {f\left( x \right) + g\left( x \right)} \right]dx} \).	</title>
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