Cho a,b>0. Chứng minh $\frac{a^2}{b^2} + \frac{b^2}{a^2} \geq \frac{a}{b} + \frac{b}{a}$
$\frac{a^2}{b^2} + \frac{b^2}{a^2} \geq \frac{a}{b} + \frac{b}{a}$
Started By canbis, 31-07-2016 - 13:21
bất đẳng thức bđt
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