Y
yoyokun98


Cho a,b,c > 0 và abc=1 . Chứng minh :
( \frac{1}{a} + \frac{1}{b} + \frac{1}{c} )(\sqrt[2]{a} + \sqrt[2]{b} +\sqrt[2]{c}) \geq (\sqrt[2]{a} + \sqrt[2]{b} + \sqrt[2]{c} )^2
( \frac{1}{a} + \frac{1}{b} + \frac{1}{c} )(\sqrt[2]{a} + \sqrt[2]{b} +\sqrt[2]{c}) \geq (\sqrt[2]{a} + \sqrt[2]{b} + \sqrt[2]{c} )^2