让学生学习、了解数学中的一些基本思想方法，是中学数学的重要教学目的之一．事实上，思想方法是一门课程的精髓，它是学生在知识遗忘后留存在脑中的不多的东西，它将在学生今后的学习和工作中长期起作用，使其终身受益．正在全国“两省一市”进行试验的新高中数学课本中，适 Allowing students to learn and understand some of the basic ideas and methods in mathematics is one of the important teaching goals of mathematics in middle school. In fact, the ideological method is the quintessence of a curriculum. It is not much of a student’s brains left behind after the knowledge is forgotten. It will play a long-term role in the student’s future learning and work, benefiting him for life. In the new high school mathematics textbooks that are being tested in “two provinces and one city” across the country,