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Given that \[a, b \in N^* \text{ and } a^2 + b^2 + a + b \mid a\times b\] Prove that \[GCD(a, b)^2 \le a + b\]

\(\textit{Just a reminder: }N^* = N \setminus \{0\}\)

Note by Mục Xiên
3 weeks, 4 days ago

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