S
sagacious


cho [TEX]\sqrt{x^2+\sqrt[3]{x^4y^2}}+\sqrt{y^2+\sqrt[3]{y^4x^2}}=a[/TEX].
chúng minh [TEX]\sqrt[3]{x^2}+\sqrt[3]{y^2}=\sqrt[3]{a^2}[/TEX]
chúng minh [TEX]\sqrt[3]{x^2}+\sqrt[3]{y^2}=\sqrt[3]{a^2}[/TEX]