替换变量自动包含已知条件，奥数换元技巧题目，巴尔干地区12国奥林匹克数学竞赛，2020年，q2
Synopsis
用替换变量的技巧，自动包含已知条件，从而大大降低题目的难度。灵活的变量替换，是奥数题解题最重要关键的技巧之一！
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