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cho [TEX]x, y, z\geq 0[/TEX] va thoa man [TEX]x+y+z\geq0 [/TEX].tim gia tri nho nhat cua
[TEX]P=\frac{x^3+y^3+16.z^3}{(x+y+z)^3}[/TEX]
[TEX]P=\frac{x^3+y^3+16.z^3}{(x+y+z)^3}[/TEX]
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