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$\frac{a^2}{b^2} + \frac{b^2}{a^2} \geq \frac{a}{b} + \frac{b}{a}$

bất đẳng thức bđt

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#1
canbis

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Cho a,b>0. Chứng minh $\frac{a^2}{b^2} + \frac{b^2}{a^2} \geq \frac{a}{b} + \frac{b}{a}$



#2
Ngockhanh99k48

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$\Leftrightarrow$ $a^4+b^4 \geq ab(a^2+b^2)$ $\Leftrightarrow$ $(a-b)^2[(a+b)^2-ab] \geq 0$





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