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根式方程最难解，学霸偷懒只用4个字母，却被老师打满分！
俄罗斯经典解方程，考生都在想去根号，学霸只用4个字母简单搞定
代数竞赛题459/778
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俄罗斯经典解方程，考生都在想去根号，学霸只用4个字母简单搞定
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