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全日制十年制学校初中数学课本第三册第三章四边形开始,教材安排用“双箭头”符号“(?)”表示从左边推出右边的证题格式。这种证题格式,推理严密,过程清楚,结论明确。但初学学生往往无从捉摸,不易掌握。在课堂教学中教师若能精心设计,运用分析法引进,这就比较自然,学生易于接受,定能收到较好的效果。今试举一例,以明一般。例如:定理矩形的对角线相等。
Full-time 10-year school junior high school math textbook Volume 3 Chapter 4 The beginning of the quadrilateral, textbook arrangement “Double arrow” symbol ("? This form of testimony, reasoning closely, the process clear, the conclusion is clear. However, beginner students are often elusive, not easy to grasp. If the teacher in the classroom teaching can be carefully designed, the introduction of analytical methods, which is more natural, easy to accept students, will be able to receive better results. Today give an example to the general. For example: The diagonal of the theorem is equal.