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新颁布的全日制普通高级中学《数学教学大纲》（实验修订本）的必修课和选修课都增加了研究性课题的教学内容，这是中学数学教学的一个新要求．大纲在列出了一些参考课题的同时又指出：“提倡教师和学生自己提出问题”，本文就按照这个要求提出一个研究性的课题──抛物线的有
The compulsory and optional courses of the newly promulgated full-time regular high school “Mathematics Syllabus” (experimental revision) have increased the teaching content of research topics. This is a new requirement for mathematics teaching in middle schools. The outline outlines some reference topics and points out that “promoting teachers and students to raise questions by themselves”, this article proposes a research topic in accordance with this requirement-parabolic