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教学目标:1、通过观察,借助学生的生活经验,使学生理解两点间所有连线中线段最短的事实。2、借助剪一剪、摆一摆等活动,积累数学活动经验,使学生在探究中感受、理解三角形任意两边的和大于第三边的道理。培养学生自主探索、动手操作、合作交流的能力。3、渗透建模思想,体验三角形三边长度的数据分析和数形结合方法在探究过程中的作用。教学重点:理解三角形任意两边的和大于第三边。教学难点:理解“任意”二字的含义。
Teaching Objectives: 1, through observation, with the help of students’ life experience, so that students understand the fact that the shortest line length of all connections between two points. 2, With the help of activities such as cutting, cutting and swinging, we accumulate experience in math activities so as to make students feel in their exploration and understand the truth that any two sides of the triangle are greater than the third side. Students develop their own exploration, hands-on, cooperation and exchange capabilities. 3, infiltration modeling ideas, to experience the length of the triangular data analysis and the number of methods of combining the role of the process of inquiry. Teaching points: Understand the triangle on both sides and greater than the third side. Difficulties in teaching: to understand the meaning of the word “any”.