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Posted by anhxuan911 on 11-11-2018 - 17:41
Cho x,y,z là các số thực dương thỏa mãn x ≥ z chứng minh rằng:
$\frac{xz}{y^{2}+yz}+\frac{y^{2}}{xz+yz}+\frac{x+2z}{x+z}\geqslant \frac{5}{2}$