课前导入是每一节课必不可少的环节,而问题式导入是多数数学教师乐于采用的方式。现代教学理论研究表明,教师和学生之间的语言交流大多数是以教师提问与学生探究思考的形式进行互动的。对学生来说,没有问题,就难以诱发和激起学生学习新知识的欲望,没有恰当的问题,知识就会变成无源之水无本之木,而学生的学习也将停留于形式或表面。这样导入部分问题的设计对一节课的成败就起到了至关重要的作用,课前提问的问题设计得好,就会大幅度地降低或减少学生学习新 Pre-class import is an essential part of every class, and problem-based import is the way most math teachers are willing to adopt. The research of modern teaching theory shows that most of the language exchanges between teachers and students interact with the form of inquiry and inquiry by students. For students, there is no problem, it is difficult to induce and arouse students desire to learn new knowledge, without proper problems, knowledge will become a waterless sourceless, and students will learn to stay in the form or surface. This part of the design into the question of the success or failure of a class has played a crucial role in pre-class questions designed well, it will significantly reduce or reduce student learning new