M
ms.sun


Chứng minh rằng:
[TEX]\sqrt{\frac{a}{b+c+d}}+\sqrt{\frac{b}{c+d+a}}+\sqr{\frac{c}{d+a+b}}+\sqrt{\frac{d}{a+b+c}}>2[/TEX]
[TEX]\sqrt{\frac{a}{b+c+d}}+\sqrt{\frac{b}{c+d+a}}+\sqr{\frac{c}{d+a+b}}+\sqrt{\frac{d}{a+b+c}}>2[/TEX]
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