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	Các bình luận về: Đề bài: Chứng minh bất đẳng thức:a) $\sqrt{x^2-2x+5 }+\sqrt{ x^2+2x+10}  \geq \sqrt{ 5} $b) $\sqrt{(a-b)^2+c^2 }+\sqrt{(a+b)^2+c^2 } \geq  2\sqrt{ a^2+c^2} $	</title>
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