A、b为正整数 a²＋b²被ab－1整除，求证a²＋b²＝5（ab－1），这题咋用韦达跳跃做？知乎 Sketch Coloring Page

A、b为正整数 a²＋b²被ab－1整除，求证a²＋b²＝5（ab－1），这题咋用韦达跳跃做？知乎 Template

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