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数形结合的精髓是函数,函数的核心是运动变化。在各地中考压轴动点问题的考查中,平行四边形的存在性问题是中考压轴题中常见的考查类型,对学生综合能力及解题技巧的要求较高。下面结合试题谈谈“平行四边形的存在性问题”中的“三定一动”和“两定两动”这两种类型的解题方法。一、“三定一动”“三定一动”指,已知三个顶点的坐标,求第四个顶点的坐标,使其构成平行四边形。在探究这个问题之前,先来回顾两个预备知识。
The essence of the combination of numbers is a function, the core of which is the change in motion. In examining the problem of the moving axis of the test center in different places, the existence of the parallelogram is a common type of examination in the test of the mid-level test, which has a high demand on students’ comprehensive ability and problem-solving skills. The following combination of questions to talk about “parallelogram of the existence of ” in “three fixed one ” and “two ” two types of problem-solving methods. First, “three set a move ” “three set a move ” means that the coordinates of the three vertices, find the coordinates of the fourth vertex, so that it constitutes a parallelogram. Before exploring this issue, first review the two preparatory knowledge.