A
anhson391997


cho a+b>1
CM:[tex]a^4+b^4>\frac{1}{8}[/tex]
ai giúp e thì là giỏi.Thanks you very much
~> Chú ý latex
CM:[tex]a^4+b^4>\frac{1}{8}[/tex]
ai giúp e thì là giỏi.Thanks you very much
~> Chú ý latex
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