Tìm $x,y,n\in \mathbb{N}$ sao cho:
$\frac{x^{2}+x}{y^{2}+y}=2^{n}$
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Posted 30-04-2017 - 00:08
NTMFlashNo1
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$\boxed{\text{Nguyễn Trực-TT-Kim Bài secondary school}}$
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