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在初中数学教学中,教师要注重对学生进行数学解题思想的培养,激发学生的学习兴趣,而化归这种数学解题思想,主要是实现化简单为复杂、化抽象为具体的一种过程。尤其是在三角形内角和定理相关题型的解题中,化归思想在课堂教学中的应用,对于学生数学知识的提升有着积极的作用。1多边形内角和向三角形内角和的化归学习三角形内角和定理之后,在对多边形内角和问题的解决中,主要是将多边形进行化归处理,将其作为三角形,化归目标选择三角形,化归对象选择多边形。在多边形的顶点逐渐地转化为不相邻顶点的应用过程,将其作为对角线的一种化归过程。
In junior high school mathematics teaching, teachers should pay attention to the students to cultivate the idea of mathematical problem solving, to stimulate students’ interest in learning, and turn to this mathematical problem solving thinking, mainly to achieve the simple and complex, abstraction as a concrete process. Especially in the solution of problems related to interior angles and theorems of trigonometry, the application of the thought of returning to the classroom has a positive effect on the improvement of students’ mathematical knowledge. After polygons internal angle and the theorem, in the polygonal angle and the solution to the problem, the polygons are mainly processed into the triangle, the triangle as the target to select the triangle, the return to normalization Object selection polygon. The gradual transformation from the vertices of polygons to the non-adjacent vertices is a process of diagonalization.