我们在解不等式问题时,常常用到下面两个基本不等式:(1)a,b∈R+,(a+b)/2≥2～(1/(ab));(2)a,b,c∈R+,(a+b+c)/3≥3～(1/(abc)).根据字母个数,分别称为二元、三元基本不等式).在解题过程中,有时会因为对上述公式选用不当,导致放缩出界,这里并不能根据字母个数、或代数式的项数选择公式,如何解决这一问题? When we solve inequality problems, we often use the following two basic inequalities: (1) a, b∈R+, (a+b)/2≥2～(1/(ab)); (2)a,b, c∈R+, (a+b+c)/3≥3~(1/(abc)). According to the number of letters, they are called binary and ternary basic inequalities.) In the process of solving problems, sometimes Improper selection of the above formula leads to out of bounds. Here, the formula cannot be selected based on the number of letters or algebraic terms. How to solve this problem?