历年来立体几何的学习都是个难点,学生在立体几何部分的学习中易出现以下几种情况:空间想象力不够;概念不清,仅注意概念中较明显的特征;图形中各元素关系理解错误;符号语言不会运用;语言表述欠准确,不能准确使用数学术语,表达不够规范、严谨;语言表达能力差,对“作、证、求”三个环节交代不清,因果关系不充分,从而导致的证题的书面表达上的错误;此外,高中课程内容也多,每节课容量 Stereo geometry over the years is a difficult learning, students tend to learn in the three-dimensional geometry of the following situations: lack of space imagination; concept is not clear, only pay attention to the more obvious characteristics of the concept; graphic elements of the relationship between the wrong understanding ; Symbolic language will not be used; language expression is not accurate, can not accurately use mathematical terms, the expression is not standardized, rigorous; poor language skills, confusion of the three links, “card, seeking,” inadequate causal relationship , Resulting in a written error on the title of the certificate; In addition, the content of high school courses are more, the capacity of each lesson