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[問題] x² + 2xy + y² + 5x + ay + b > 0

Autor:羅驥韡 (Pegasus Roe)
若對於任意實數 x, y，x² + 2xy + y² + 5x + ay + b > 0 恆成立，求 a, b 的條件？
答：a = 5, b > 25/4（提示：利用判別式）

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