Câu hỏi 187
Cho $a$, $b$, $c \gt 0$. Chứng minh rằng
$$
\sqrt{\frac{a}{b+c}} + \sqrt{\frac{b}{c+a}} + \sqrt{\frac{c}{a+b}} \gt 2.
$$
$$
\sqrt{\frac{a}{b+c}} + \sqrt{\frac{b}{c+a}} + \sqrt{\frac{c}{a+b}} \gt 2.
$$
MathNet 2015-part-02 — 191 bài (EN–VI) Câu hỏi 187
Math Olympiad Vault · MathNet 2015-part-02 — 191 bài (EN–VI)