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El_Nino hasn't added any friends yet.
19-12-2010 - 17:26
ta có $\dfrac{1}{2x+y+z}\leq \dfrac{1}{4}( \dfrac{1}{x+y}+\dfrac{1}{x+z})\leq\dfrac{1}{16} ( \dfrac{2}{x}+\dfrac{1}{z}+\dfrac{1}{y})$2 cái kia cũng tương tự cộng vào ta có đpcm
26-10-2010 - 19:39