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cho [tex]x,y,z \geq 0 t/m: x^3+y^3+z^3=a[/tex]
Tìm min [tex]\frac{x}{\sqrt[3]{1-x^2}}+\frac{y}{\sqrt[3]{1-y^2}}+\frac{z}{\sqrt[3]{1-z^2}}[/tex]
Tìm min [tex]\frac{x}{\sqrt[3]{1-x^2}}+\frac{y}{\sqrt[3]{1-y^2}}+\frac{z}{\sqrt[3]{1-z^2}}[/tex]