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这题最爱跟你捉迷藏,把a藏在一堆式子里。其实它就是让你找函数的最小值,找到就抓住它了。换元后变成“对勾函数”,那玩意儿左摇右摆,像跷跷板,你找到平衡点它就老实。别去解复杂不等式,让导数或均值上去“撩”它一下,它就露馅了。玩这类题,心态要稳,把它当游戏,你越轻松,它越配合。下次见面,直接说“别躲了,出来单挑!”
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