应用构造思想解题的关键有二:一是要有明确的方向,即为什么目的而构造;二是弄清条件的本质特点和背景,以便重新进行逻辑组合·常用的有构造命题、构造表达式、构造几何体等,本文拟就通过 There are two key points to solve the problem with the application of construction: First, there must be a clear direction, that is, why the purpose of construction; Second, to clarify the essential nature of the conditions and background in order to re-logical combination of commonly used construction propositions, construct expressions , Geometry, etc., this article intended to pass