Fie \( a,b,c \) numere pozitive astfel incat \( abc=1 \) . Demonstrati ca :
\( \sum_{cyc}\frac{1}{a^2+2b^2+3}\le \frac{1}{2} \)
Mircea Lascu
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Marius Mainea
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S-a mai postat aici
, dar e din iunie anul trecut . 
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maxim bogdan
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