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	Các bình luận về: Cho hàm số \(y = f\left( x \right) = \left\{ \begin{array}{l}{x^2} + 3{\rm{ }}khi x \ge 1\\5 &#8211; x{\rm{  khi }}x &#060; 1\end{array} \right.\). Giả sử \(F\) là nguyên hàm của \(f\) trên \(\mathbb{R}\) thỏa mãn \(F\left( 3 \right) = 20\). Giá trị của \(F\left( { &#8211; 1} \right)\) là	</title>
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