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	Các bình luận về: 20. Cho \(f(x)\) là một hàm đa thức bậc năm thoả mãn \(f\left( 0 \right) = 0\). Hàm số\(f&#8217;\left( x \right)\) có đồ thị như hình vẽ bên	</title>
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