L
lucprokuteqb01


Ai giúp mình zới 
1 Cho [TEX] x , y , z > 0 . xy < 1[/TEX]
C/m : [TEX]\frac{1}{1 + x } + \frac{1}{1 + y } < \frac{2}{1 + \sqrt{xy} } [/TEX]
2. Cho [TEX]0 < x , y , z < 1[/TEX]
C/m : [TEX] \frac{1}{1 + x^2 } + \frac{1}{1 + y^2 } + \frac{1}{1 + z^2 } \leq \frac{3}{xyz }[/TEX]
...Good luck!!!
1 Cho [TEX] x , y , z > 0 . xy < 1[/TEX]
C/m : [TEX]\frac{1}{1 + x } + \frac{1}{1 + y } < \frac{2}{1 + \sqrt{xy} } [/TEX]
2. Cho [TEX]0 < x , y , z < 1[/TEX]
C/m : [TEX] \frac{1}{1 + x^2 } + \frac{1}{1 + y^2 } + \frac{1}{1 + z^2 } \leq \frac{3}{xyz }[/TEX]
...Good luck!!!
Last edited by a moderator: