Cho $a,b,c\geqslant 0$ và $a^{2}+b^{2}+c^{2}=1$
Tìm max $\frac{2a+c}{1+bc}+\frac{2b+c}{1+ac}+\frac{ab+b+c}{1+\sqrt{2}.abc}$
Max $\frac{2a+c}{1+bc}+\frac{2b+c}{1+ac}+\frac{ab+b+c}{1+\sqrt{2}.abc}$
Started By banhbaocua1, 21-04-2014 - 19:19
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