Cho x, y, z là các số thực. Chứng minh rằng $(x^{3}+3)(y^{3}+3)(z^{3}+3)\geq \frac{4}{27}(3xy+3yz+3zx+xyz)^{2}$
Edited by hachinh2013, 19-03-2015 - 08:16.
Chứng minh rằng $\prod (x^{3}+3)\geq \frac{4}{27}(3xy+3yz+3zx+xyz)^{2}$
Started By Ngoc Hung, 19-03-2015 - 08:15
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