数学是运算的科学,而运算的核心是恒等变形.从某种意义上讲,数学问题的解决其本质就是通过恒等变形进行化简直至导出结论的过程.[1]教师有这样的感受:学生对常见的变形无所适从,在教师提示下感觉变形是合情合理甚至是理所当然的.下面撷取两个教学片断,谈谈笔者的教学感悟. Mathematics is the science of computing, and the core of computing is equal deformation. In a sense, the essence of solving mathematical problems is to simplify the process of identity transformation until the conclusions are drawn. [1] Teachers have such feelings : Students at a loss of common sense of deformation, feel deformed under the guidance of the teacher is reasonable or even taken for granted the following two pieces of teaching to retrieve, talk about the author’s teaching insights.