不等式是中学数学的重要内容之一 ,而平均不等式是不等式中的重要不等式 ,这“重中之重”决定了它是永不衰退的高考热点 .事实也正是如此 ,近三年高考题中 ,1997年全国文、理第 2 2题 ,1998年全国文、理第 2 2题 ,1999年全国文、理第 2 0题都涉及到平均不等式 .因此正确理解、 Inequality is one of the important contents of middle school mathematics, and the average inequality is an important inequality in inequality. This “high priority” determines that it is a never-fading college entrance examination hotspot. The fact is also true that the last three years of college entrance examination questions , The 1997 National Document and Theory Question No. 22, the 1998 National Document and Theory Question No. 22, and the 1999 National Documentary and Scientific Paper No. 20 all involved the average inequality. Therefore, we must correctly understand,