Cho $a, b, c$ là các số thực không âm thoả mãn: $ab+bc+ca=1$. CMR:
$\frac{1}{\sqrt{a+b}}+\frac{1}{\sqrt{b+c}}+\frac{1}{\sqrt{c+a}}\geq 2+\frac{1}{\sqrt{2}}$
Edited by NTA1907, 17-02-2016 - 22:13.
$\sum \frac{1}{\sqrt{a+b}}\geq 2+\frac{1}{\sqrt{2}}$
Started By NTA1907, 17-02-2016 - 22:11
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