N
nhoc_vip_qk98


cho a,b,c >0 và ab + bc + ac = abc. CMR
\frac{\sqrt[2]{b^2 + 2a^2}}{ab} + \frac{\sqb[2]{c^2 + 2b^2}}{bc} + \frac{\sqrt[2]{a^2 + 2 c^2}}{ac} \geq \sqrt[2]{3}
\frac{\sqrt[2]{b^2 + 2a^2}}{ab} + \frac{\sqb[2]{c^2 + 2b^2}}{bc} + \frac{\sqrt[2]{a^2 + 2 c^2}}{ac} \geq \sqrt[2]{3}