向量解题以“建”为贵

• 作 者: 陈树昱
• 机 构: 河南省民权县高级中学,
• 出 处: 理科考试研究
• 发表日期: 2016年21期
• 关键词: 平面向量 坐标系 几何内容 知识点 学习 求解 倾向 考查 结构 建行 高考 方法

高考中对于平面向量的考查,多倾向于平面几何内容,这个知识点既是学习的重点,又是求解的热点,因此构建行之有效的方法难能可贵.将向量置于坐标系的背景之下,赋予向量坐标的结构,权称为“建”法,往往有事半功倍之效.下面举例说明.一、“建”法解数量积问题

College entrance examination for plane vector, tend to planar geometric content, this knowledge point is not only the focus of learning, but also the hot spot for solving, so building an effective method is commendable.The vector is placed in the context of the coordinate system, given The structure of the vector coordinates, the right to be called “building ” method, often with more with the multiplier effect. The following is an example.