Tìm $f(x) \mathbb{R}\rightarrow \mathbb{R}$ thỏa mãn:
$i) f(2x)=2f(x)$;
$ii) f(x)+f(-x)=0$.
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Tìm $f(x) \mathbb{R}\rightarrow \mathbb{R}$ thỏa mãn:
$i) f(2x)=2f(x)$;
$ii) f(x)+f(-x)=0$.
Redragon
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