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片段一(一)出示主题图。师:右图出示的图案排列有规律吗?你能找出来吗?学生观察、思考。师:谁愿意把你找到的规律告诉大家?生1:斜的一样。生2:把左上角的圆放到左边第一例的最后一个去,后面三个都不动,整个图案向前移了一步。生3:斜着看,图案排列是圆形、三角形、正方形,五角星
Fragment one (a) to produce thematic map. Teacher: Are the patterns shown in the right picture arranged regularly? Can you find out? Students observe and think. Teacher: Who is willing to tell you the law you found? Health 1: Oblique. Students 2: Put the top left corner of the circle to the left of the first case of the last one, the latter three do not move, the entire pattern to move forward one step. Students 3: Looking obliquely, the pattern is arranged in a circle, triangle, square, five-pointed star