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Member Since 08-01-2016
Offline Last Active 10-08-2017 - 21:14

21-01-2016 - 22:44

Cho x, y, z $> 0$ thỏa mãn : $3xy + yz + 2 zx = 6$

Tìm GTNN của biểu thức:

P= $\frac{1}{1+x^{2}} + \frac{4}{4+y^{2}} + \frac{9}{9+z^{2}}$

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