Cho a,b,c dương thoả mãn $\frac{1}{c^{2}}=\frac{2}{a^{2}}+\frac{2}{b^{2}}$
Chứng minh rằng $\frac{a}{b+c}+\frac{b}{c+a}+\frac{c}{\sqrt{a^{2}+b^{2}+c^{2}}}\geq \frac{5}{3}$
Chứng minh rằng $\frac{a}{b+c}+\frac{b}{c+a}+\frac{c}{\sqrt{a^{2}+b^{2}+c^{2}}}\geq \frac{5}{3&#
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Started By taideptrai, 10-09-2015 - 21:51
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