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Binh nhất
Cho các số thực dương $a,b,c$ thỏa mãn $ab+bc+ca=3$. Chứng minh rằng$\frac{a}{a^{2}+7}+\frac{b}{b^{2}+7}+\frac{c}{c^{2}+7}\leq \frac{3}{8}$
Edited by kogioitoan, 07-09-2021 - 14:56.
Bạn tham khảo: https://artofproblem...709411p11019437
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