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导数法，“1”的代换，一道经典最值问题的另外2种方法，高中数学
高中数学，回顾一道经典好题，再讲解另外2种方法：消元后运用导数法，巧妙运用“1”的代换，构造类似倒数结构，从而运用均值不等式。
高考重要不等式的运用合集49/137
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