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	Các bình luận về: Đề: Cho các hàm số \(y = \frac{{x + 1}}{{x &#8211; 1}}\,,y =  &#8211; {x^3} + {x^2} &#8211; 3x + 1,y = {x^4} + 2{x^2} + 2\). Trong các hàm số trên, có bao nhiêu hàm số đơn điệu trên \(\mathbb{R}?\)	</title>
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