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	Các bình luận về:  (Đại học Hồng Đức – 2022) Cho \(f(x) = {x^3} &#8211; 3{x^2} + 1\). Phương trình \(\sqrt {f(f(x) + 1) + 1} = f(x) + 2\) có số nghiệm thực là	</title>
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