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教学目标:1、认识组合图形,了解组合图形的特点,理解计算组合图形面积的多种方法,能运用所学知识解决生活中的实际问题。2、在小组合作交流、自主探究中学会利用转化思想来计算组合图形面积,在交流汇报的同时培养学生的有序思维。3、激发学生学习的积极性,培养学生空间观念。教学重难点:重点:通过动手操作,探索出组合图形面积的计算方法。难点:掌握用分割法和添补法等计算组合图形面积的方
Teaching objectives: 1, understanding of the combination of graphics to understand the characteristics of the combination of graphics to understand the combination of graphics area a variety of ways to use the knowledge learned to solve practical problems in life. 2, in the group of cooperation and exchange, self-exploration of secondary schools will use the conversion of ideas to calculate the combination of graphics area, in the exchange of reports at the same time cultivate students’ orderly thinking. 3, to stimulate the enthusiasm of students learning, cultivate students space concept. Teaching heavy and difficult: Focus: Through hands-on operation, to explore the combination of graphics area calculation. Difficulty: master the use of segmentation and Tim method to calculate the combination of graphics area of the square