教学思维场的构建与小学数学教学（下）□陈梦璋小数教学中，为了实现认知结构的整体优化，应注意：（１）引导学生抓住知识要点，把最重要的知识放在核心位置，以它为核心建构知识网络。例如几何平面图形以平行四边形为核心组成知识系统（图形特征和面积计算公式两个系统... In order to achieve the overall optimization of cognitive structure, we should pay attention to: (1) to guide students to grasp the key points of knowledge, put the most important knowledge in the core position, Constructs the knowledge network with it as the core. For example, geometric planar graphics parallelogram as the core composition of knowledge systems (graphics features and area calculation of two systems ...