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teocauvuot


Cho a+b=1. cm
a)[TEX]a^2+b^2 \geq \frac{1}{2}[/TEX]
[TEX]b)a^4+b^4 \geq \frac{1}{8}[/TEX]
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a)[TEX]a^2+b^2 \geq \frac{1}{2}[/TEX]
[TEX]b)a^4+b^4 \geq \frac{1}{8}[/TEX]
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