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用平均值不等式求最值(或证明不等式)是高中代数中的一个重点和难点.应用时必须注意三个限制条件,即“一正(各项都为正数)、二定(各项的
The use of the mean inequality to find the maximum value (or prove inequality) is a key and difficult point in high school algebra. It must pay attention to three restrictions when applied, that is, "a positive number (all are positive numbers), second set (a variety of