众所周知，当且仅当a=b时取等号）及，当且仅当a=b=c时取等号）是两个重要的基本不等式，它们应用广泛、灵活，是解题的有效工具．本文结合常见的变形技巧，利用上面的两个基本不等式来解一些竞赛题，以期进一步提高、深化我们使用两个基本不等式解题的能力。一、项的巧拆与巧 It is well known that taking equal signs if and only if a=b and taking equal signs if and only if a=b=c) are two important basic inequalities. They are widely used and flexible and are effective tools for problem solving. . This article combines common deformation techniques, using the above two basic inequalities to solve some contest problems, in order to further improve and deepen our ability to use two basic inequalities to solve problems. The clever dismantling and skillfulness of the first item