解析几何中有关求取值范围的问题,常要借助不等式求解,解题的关键是充分利用已知条件、挖掘题目的隐含条件来构造不等式.本文谈一下解决此类问题常见方法. The problem of finding the range of values ​​in analytical geometry is often solved by means of inequalities. The key to solving problems is to make full use of the known conditions and implicit conditions of the topics to construct inequalities. This article discusses common methods for solving such problems.