《数学课程标准》指出:要让“学生在生动具体的情境中学习数学”;“获得成功的体验,树立学好数学的自信心”。对学生而言,体验是一种亲身经历的学习活动,是一种积极主动的学习方式,是一种促进知识内化进而建立认知结构的有效途径。如何创设问题情境,让学生“在情境中体验,在活动 The Mathematics Curriculum Standard states: “Students should learn mathematics in vivid and concrete situations.” “To gain a successful experience and to establish self-confidence to learn math.” For students, experiencing is a kind of personal experiencing learning activity, which is a kind of active learning method and an effective way to promote knowledge internalization and then establish cognitive structure. How to create a problem situation, so that students "experience in the context of the activities