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教材分析:五年级数学(青岛版)中轴对称图形是第二单元图案美——对称、平移与旋转的第一个信息窗.学生在三年级已初步认识了简单的轴对称现象,会判断简单的图形是否是轴对称图形并找出其一条对称轴.在此基础上教材通过一组具有轴对称图形特点的旗帜唤起学生对已有知识的回忆,进一步教学较复杂的轴对称图形及对称轴的含义,并能找出轴对称图形的所有的对称轴,近而引导学生画出图形的另一半并使它成为轴对称图形.
Textbook analysis: fifth grade mathematics (Qingdao Edition) axisymmetric graphics is the second element of the United States - symmetry, translation and rotation of the first information window. Students in the third grade has been a preliminary understanding of the simple axisymmetric phenomenon, will determine Whether a simple graph is an axisymmetric graph and find out an axis of symmetry, on the basis of which a textbook evokes students’ memory of existing knowledge through a group of flags with axisymmetric graphical features to further teach more complicated axisymmetric graphs and symmetry The meaning of the axes, and the ability to find all the symmetry axes of the axisymmetric graph, will then guide the student to draw the other half of the graph and make it an axisymmetric graph.