Chứng minh rằng nếu a, b, c > 0 thì
$\frac{a+b+c}{ab+bc+ca} \geq {}\sum \frac{a}{a^{2}+bc+b^{2}}$
$\frac{a+b+c}{ab+bc+ca} \geq {}\sum \frac{a}{a^{2}+bc+b^{2}}$
Started By LumiseEdireKRN, 30-09-2014 - 23:07
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Posted 30-09-2014 - 23:07
LumiseEdireKRN
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