

chứng minh rằng :
[tex]\sqrt[3]{\sqrt[3]{2}- 1}= \sqrt[3]{\frac{1}{9}}-\sqrt[3]{\frac{2}{9}}+ \sqrt[3]{\frac{4}{9}}[/tex]
[tex]\sqrt[3]{\sqrt[3]{2}- 1}= \sqrt[3]{\frac{1}{9}}-\sqrt[3]{\frac{2}{9}}+ \sqrt[3]{\frac{4}{9}}[/tex]
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