Cho x,y,z là ba số không âm thỏa mãn: x + y + z = 1. Chứng minh rằng:

\(\frac{x}{1+x^2}+\frac{y}{1+y^2}+\frac{z}{1+z^2}\le\frac{9}{10}\)

Các câu hỏi liên quan

Tính nhanh

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