不等式在中学数学中占有重要的位置,是历年高考的重点内容之一。不等式的证明既是重点又是难点,用放缩法证明不等式又是证明不等式的各种方法中较难把握的一种方法。 Inequality plays an important role in middle school mathematics and is one of the key contents of the college entrance examination. The proof of inequality is both important and difficult. Using indentation to prove inequality is also a difficult method to prove in inequality.