Cho a; b; c là các số thực dương thỏa mãn $15\sum \frac{1}{a^2}= 10\sum \frac{1}{ab}+2007$
Tìm $min$ $\sum \frac{1}{\sqrt{5a^2+2ab+2b^2}}$
Tìm $min$ $\sum \frac{1}{\sqrt{5a^2+2ab+2b^2}}$
Started By shinichikudo201, 21-01-2015 - 21:56
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Posted 21-01-2015 - 21:56
shinichikudo201
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