Cho x,y,z >0. Chứng minh rằng:$\frac{\sqrt{y+z}}{x}+\frac{\sqrt{z+x}}{y}+\frac{\sqrt{x+y}}{z}\geq \frac{4(x+y+z)}{\sqrt{(y+z)(z+x)(x+y)}}$
Cho x,y,z >0. Chứng minh rằng:$\frac{\sqrt{y+z}}{x}+\frac{\sqrt{z+x}}{y}+...$
Started By lylymaymac, 22-10-2017 - 18:27
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