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近日,笔者在《中小学数学》(小学版)2009年第12期拜读了戴振华老师的《“做中学”——让探究延伸到数学课堂每个角落》一文,文中的一个细节引起了笔者的思考。(细节如下)(学生课前已将做好的各种圆柱带来)(学生动手拆、剪,发现侧面有的是长方形,有的是正方形,有的是平行四边形)师:剪、拆的过程中你有什么发现?生:我是竖着剪的,圆柱体侧面展开后得到了一个长方形侧面,还发现这个缝隙就是圆柱体的高。生:(补充)我是斜着剪的,我发现斜着剪,侧面展开了就得到了平行四边形。
Recently, the author of “primary and middle school mathematics” (12th edition) in 2009 No. 12 read Dai Zhenhua’s “” to do high school “- let the inquiry extends to every corner of mathematics classroom,” a text, a detail caused The author’s thinking. (Details are as follows) (students have done before the column has brought a variety of cylindrical) (students disassemble, cut, found that some of the side of the rectangle, some are square, some are parallelogram) Teacher: Scissor, dismantling in the process what you found Health: I was scissor-cut, cylindrical side was expanded to get a rectangular side, also found that the gap is the height of the cylinder. Students: (Supplementary) I was skewed, I found oblique cut, the side started to get a parallelogram.