在不等式的学习中,我们结识了一个重要的不等式定理,即基本不等式(又叫均值定理),这个定理在解题中应用十分广泛.运用基本不等式时除了要注意“一正、二定、三相等”的条件以外,在多次运用基本不等式时,需要特别注意其中等号成立的条件,下面以例说明其重要性. In the study of inequality, we met an important inequality theorem, namely the basic inequality (also known as the mean value theorem). This theorem is widely used in solving problems. When using the basic inequality, we must pay attention to "a positive and a negative, In addition to the condition of three equals, when the basic inequality is used multiple times, special attention must be paid to the condition in which the equal sign is established. The following example illustrates its importance.