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	Các bình luận về: Cho hàm số\(y = f\left( x \right)\) có bảng xét dấu của đạo hàm \(y = f&#8217;\left( x \right)\)như sau







Hàm số \(y = 3f\left( { &#8211; x + 2} \right) + {x^3} + 3{x^2} &#8211; 9x + 1\) nghịch biến trên khoảng nào sau đây?	</title>
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